Turn on -Wshorten-64-to-32 and fix all the errors

Summary:
We need to turn on -Wshorten-64-to-32 for mobile. See D1671432 (internal phabricator) for details.

This diff turns on the warning flag and fixes all the errors. There were also some interesting errors that I might call bugs, especially in plain table. Going forward, I think it makes sense to have this flag turned on and be very very careful when converting 64-bit to 32-bit variables.

Test Plan: compiles

Reviewers: ljin, rven, yhchiang, sdong

Reviewed By: yhchiang

Subscribers: bobbaldwin, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D28689

Makefile

@@ -147,7 +147,6 @@ TESTS = \
 	cuckoo_table_builder_test \
 	cuckoo_table_reader_test \
 	cuckoo_table_db_test \
-	write_batch_with_index_test \
 	flush_job_test \
 	wal_manager_test \
 	listener_test \

build_tools/build_detect_platform

@@ -284,6 +284,14 @@ EOF
     fi
 fi
 
+# Test whether -Wshorten-64-to-32 is available
+$CXX $CFLAGS -x c++ - -o /dev/null -Wshorten-64-to-32 2>/dev/null  <<EOF
+  int main() {}
+EOF
+if [ "$?" = 0 ]; then
+    COMMON_FLAGS="$COMMON_FLAGS -Wshorten-64-to-32"
+fi
+
 # shall we use HDFS?
 
 if test "$USE_HDFS"; then

db/c.cc

@@ -385,11 +385,9 @@ struct rocksdb_mergeoperator_t : public MergeOperator {
     unsigned char success;
     size_t new_value_len;
     char* tmp_new_value = (*full_merge_)(
-        state_,
-        key.data(), key.size(),
-        existing_value_data, existing_value_len,
-        &operand_pointers[0], &operand_sizes[0], n,
-        &success, &new_value_len);
+        state_, key.data(), key.size(), existing_value_data, existing_value_len,
+        &operand_pointers[0], &operand_sizes[0], static_cast<int>(n), &success,
+        &new_value_len);
     new_value->assign(tmp_new_value, new_value_len);
 
     if (delete_value_ != nullptr) {
@@ -417,7 +415,7 @@ struct rocksdb_mergeoperator_t : public MergeOperator {
     size_t new_value_len;
     char* tmp_new_value = (*partial_merge_)(
         state_, key.data(), key.size(), &operand_pointers[0], &operand_sizes[0],
-        operand_count, &success, &new_value_len);
+        static_cast<int>(operand_count), &success, &new_value_len);
     new_value->assign(tmp_new_value, new_value_len);
 
     if (delete_value_ != nullptr) {
@@ -2041,7 +2039,7 @@ void rocksdb_options_set_min_level_to_compress(rocksdb_options_t* opt, int level
 
 int rocksdb_livefiles_count(
   const rocksdb_livefiles_t* lf) {
-  return lf->rep.size();
+  return static_cast<int>(lf->rep.size());
 }
 
 const char* rocksdb_livefiles_name(

db/c_test.c

@@ -132,7 +132,7 @@ static void CmpDestroy(void* arg) { }
 
 static int CmpCompare(void* arg, const char* a, size_t alen,
                       const char* b, size_t blen) {
-  int n = (alen < blen) ? alen : blen;
+  size_t n = (alen < blen) ? alen : blen;
   int r = memcmp(a, b, n);
   if (r == 0) {
     if (alen < blen) r = -1;

db/column_family_test.cc

@@ -133,7 +133,7 @@ class ColumnFamilyTest {
   void CreateColumnFamilies(
       const std::vector<std::string>& cfs,
       const std::vector<ColumnFamilyOptions> options = {}) {
-    int cfi = handles_.size();
+    int cfi = static_cast<int>(handles_.size());
     handles_.resize(cfi + cfs.size());
     names_.resize(cfi + cfs.size());
     for (size_t i = 0; i < cfs.size(); ++i) {
@@ -231,7 +231,7 @@ class ColumnFamilyTest {
       snprintf(buf, sizeof(buf), "%s%d", (level ? "," : ""), f);
       result += buf;
       if (f > 0) {
-        last_non_zero_offset = result.size();
+        last_non_zero_offset = static_cast<int>(result.size());
       }
     }
     result.resize(last_non_zero_offset);
@@ -287,8 +287,8 @@ class ColumnFamilyTest {
     assert(num_per_cf.size() == handles_.size());
 
     for (size_t i = 0; i < num_per_cf.size(); ++i) {
-      ASSERT_EQ(num_per_cf[i],
-                GetProperty(i, "rocksdb.num-immutable-mem-table"));
+      ASSERT_EQ(num_per_cf[i], GetProperty(static_cast<int>(i),
+                                           "rocksdb.num-immutable-mem-table"));
     }
   }
 
@@ -916,11 +916,11 @@ TEST(ColumnFamilyTest, DontRollEmptyLogs) {
   CreateColumnFamiliesAndReopen({"one", "two", "three", "four"});
 
   for (size_t i = 0; i < handles_.size(); ++i) {
-    PutRandomData(i, 10, 100);
+    PutRandomData(static_cast<int>(i), 10, 100);
   }
   int num_writable_file_start = env_->GetNumberOfNewWritableFileCalls();
   // this will trigger the flushes
-  for (size_t i = 0; i <= 4; ++i) {
+  for (int i = 0; i <= 4; ++i) {
     ASSERT_OK(Flush(i));
   }
 

db/compaction.cc

@@ -124,9 +124,9 @@ Compaction::~Compaction() {
 
 void Compaction::GenerateFileLevels() {
   input_levels_.resize(num_input_levels());
-  for (int which = 0; which < num_input_levels(); which++) {
-    DoGenerateLevelFilesBrief(
-        &input_levels_[which], inputs_[which].files, &arena_);
+  for (size_t which = 0; which < num_input_levels(); which++) {
+    DoGenerateLevelFilesBrief(&input_levels_[which], inputs_[which].files,
+                              &arena_);
   }
 }
 
@@ -144,7 +144,7 @@ bool Compaction::IsTrivialMove() const {
 }
 
 void Compaction::AddInputDeletions(VersionEdit* out_edit) {
-  for (int which = 0; which < num_input_levels(); which++) {
+  for (size_t which = 0; which < num_input_levels(); which++) {
     for (size_t i = 0; i < inputs_[which].size(); i++) {
       out_edit->DeleteFile(level(which), inputs_[which][i]->fd.GetNumber());
     }
@@ -207,7 +207,7 @@ bool Compaction::ShouldStopBefore(const Slice& internal_key) {
 
 // Mark (or clear) each file that is being compacted
 void Compaction::MarkFilesBeingCompacted(bool mark_as_compacted) {
-  for (int i = 0; i < num_input_levels(); i++) {
+  for (size_t i = 0; i < num_input_levels(); i++) {
     for (unsigned int j = 0; j < inputs_[i].size(); j++) {
       assert(mark_as_compacted ? !inputs_[i][j]->being_compacted :
                                   inputs_[i][j]->being_compacted);
@@ -293,7 +293,7 @@ void Compaction::Summary(char* output, int len) {
     return;
   }
 
-  for (int level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
+  for (size_t level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
     if (level_iter > 0) {
       write += snprintf(output + write, len - write, "], [");
       if (write < 0 || write >= len) {
@@ -317,7 +317,7 @@ uint64_t Compaction::OutputFilePreallocationSize(
   if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
     preallocation_size = mutable_options.MaxFileSizeForLevel(output_level());
   } else {
-    for (int level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
+    for (size_t level_iter = 0; level_iter < num_input_levels(); ++level_iter) {
       for (const auto& f : inputs_[level_iter].files) {
         preallocation_size += f->fd.GetFileSize();
       }

db/compaction.h

@@ -23,7 +23,7 @@ struct CompactionInputFiles {
   inline bool empty() const { return files.empty(); }
   inline size_t size() const { return files.size(); }
   inline void clear() { files.clear(); }
-  inline FileMetaData* operator[](int i) const { return files[i]; }
+  inline FileMetaData* operator[](size_t i) const { return files[i]; }
 };
 
 class Version;
@@ -48,7 +48,7 @@ class Compaction {
 
   // Returns the level associated to the specified compaction input level.
   // If compaction_input_level is not specified, then input_level is set to 0.
-  int level(int compaction_input_level = 0) const {
+  int level(size_t compaction_input_level = 0) const {
     return inputs_[compaction_input_level].level;
   }
 
@@ -56,7 +56,7 @@ class Compaction {
   int output_level() const { return output_level_; }
 
   // Returns the number of input levels in this compaction.
-  int num_input_levels() const { return inputs_.size(); }
+  size_t num_input_levels() const { return inputs_.size(); }
 
   // Return the object that holds the edits to the descriptor done
   // by this compaction.
@@ -66,7 +66,7 @@ class Compaction {
   // compaction input level.
   // The function will return 0 if when "compaction_input_level" < 0
   // or "compaction_input_level" >= "num_input_levels()".
-  int num_input_files(size_t compaction_input_level) const {
+  size_t num_input_files(size_t compaction_input_level) const {
     if (compaction_input_level < inputs_.size()) {
       return inputs_[compaction_input_level].size();
     }
@@ -83,7 +83,7 @@ class Compaction {
   // specified compaction input level.
   // REQUIREMENT: "compaction_input_level" must be >= 0 and
   //              < "input_levels()"
-  FileMetaData* input(size_t compaction_input_level, int i) const {
+  FileMetaData* input(size_t compaction_input_level, size_t i) const {
     assert(compaction_input_level < inputs_.size());
     return inputs_[compaction_input_level][i];
   }
@@ -98,7 +98,7 @@ class Compaction {
   }
 
   // Returns the LevelFilesBrief of the specified compaction input level.
-  LevelFilesBrief* input_levels(int compaction_input_level) {
+  LevelFilesBrief* input_levels(size_t compaction_input_level) {
     return &input_levels_[compaction_input_level];
   }
 

db/compaction_job.cc

@@ -415,32 +415,33 @@ Status CompactionJob::Run() {
   }
 
   compaction_stats_.micros = env_->NowMicros() - start_micros - imm_micros;
-  compaction_stats_.files_in_leveln = compact_->compaction->num_input_files(0);
+  compaction_stats_.files_in_leveln =
+      static_cast<int>(compact_->compaction->num_input_files(0));
   compaction_stats_.files_in_levelnp1 =
-      compact_->compaction->num_input_files(1);
+      static_cast<int>(compact_->compaction->num_input_files(1));
   MeasureTime(stats_, COMPACTION_TIME, compaction_stats_.micros);
 
-  int num_output_files = compact_->outputs.size();
+  size_t num_output_files = compact_->outputs.size();
   if (compact_->builder != nullptr) {
     // An error occurred so ignore the last output.
     assert(num_output_files > 0);
     --num_output_files;
   }
-  compaction_stats_.files_out_levelnp1 = num_output_files;
+  compaction_stats_.files_out_levelnp1 = static_cast<int>(num_output_files);
 
-  for (int i = 0; i < compact_->compaction->num_input_files(0); i++) {
+  for (size_t i = 0; i < compact_->compaction->num_input_files(0); i++) {
     compaction_stats_.bytes_readn +=
         compact_->compaction->input(0, i)->fd.GetFileSize();
     compaction_stats_.num_input_records +=
         static_cast<uint64_t>(compact_->compaction->input(0, i)->num_entries);
   }
 
-  for (int i = 0; i < compact_->compaction->num_input_files(1); i++) {
+  for (size_t i = 0; i < compact_->compaction->num_input_files(1); i++) {
     compaction_stats_.bytes_readnp1 +=
         compact_->compaction->input(1, i)->fd.GetFileSize();
   }
 
-  for (int i = 0; i < num_output_files; i++) {
+  for (size_t i = 0; i < num_output_files; i++) {
     compaction_stats_.bytes_written += compact_->outputs[i].file_size;
   }
   if (compact_->num_input_records > compact_->num_output_records) {

db/compaction_picker.cc

@@ -46,7 +46,7 @@ CompressionType GetCompressionType(
   // If the use has specified a different compression level for each level,
   // then pick the compression for that level.
   if (!ioptions.compression_per_level.empty()) {
-    const int n = ioptions.compression_per_level.size() - 1;
+    const int n = static_cast<int>(ioptions.compression_per_level.size()) - 1;
     // It is possible for level_ to be -1; in that case, we use level
     // 0's compression.  This occurs mostly in backwards compatibility
     // situations when the builder doesn't know what level the file
@@ -75,7 +75,7 @@ void CompactionPicker::SizeBeingCompacted(std::vector<uint64_t>& sizes) {
     uint64_t total = 0;
     for (auto c : compactions_in_progress_[level]) {
       assert(c->level() == level);
-      for (int i = 0; i < c->num_input_files(0); i++) {
+      for (size_t i = 0; i < c->num_input_files(0); i++) {
         total += c->input(0, i)->compensated_file_size;
       }
     }
@@ -870,7 +870,8 @@ Compaction* UniversalCompactionPicker::PickCompaction(
       // If max read amplification is exceeding configured limits, then force
       // compaction without looking at filesize ratios and try to reduce
       // the number of files to fewer than level0_file_num_compaction_trigger.
-      unsigned int num_files = level_files.size() -
+      unsigned int num_files =
+          static_cast<unsigned int>(level_files.size()) -
           mutable_cf_options.level0_file_num_compaction_trigger;
       if ((c = PickCompactionUniversalReadAmp(
                cf_name, mutable_cf_options, vstorage, score, UINT_MAX,
@@ -1074,8 +1075,7 @@ Compaction* UniversalCompactionPicker::PickCompactionUniversalReadAmp(
   if (ratio_to_compress >= 0) {
     uint64_t total_size = vstorage->NumLevelBytes(kLevel0);
     uint64_t older_file_size = 0;
-    for (unsigned int i = files.size() - 1;
-         i >= first_index_after; i--) {
+    for (size_t i = files.size() - 1; i >= first_index_after; i--) {
       older_file_size += files[i]->fd.GetFileSize();
       if (older_file_size * 100L >= total_size * (long) ratio_to_compress) {
         enable_compression = false;

db/compaction_picker_test.cc

@@ -109,7 +109,7 @@ TEST(CompactionPickerTest, Level0Trigger) {
   std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
       cf_name, mutable_cf_options, &vstorage, &log_buffer));
   ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(2, compaction->num_input_files(0));
+  ASSERT_EQ(2U, compaction->num_input_files(0));
   ASSERT_EQ(1U, compaction->input(0, 0)->fd.GetNumber());
   ASSERT_EQ(2U, compaction->input(0, 1)->fd.GetNumber());
 }
@@ -121,7 +121,7 @@ TEST(CompactionPickerTest, Level1Trigger) {
   std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
       cf_name, mutable_cf_options, &vstorage, &log_buffer));
   ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1, compaction->num_input_files(0));
+  ASSERT_EQ(1U, compaction->num_input_files(0));
   ASSERT_EQ(66U, compaction->input(0, 0)->fd.GetNumber());
 }
 
@@ -136,8 +136,8 @@ TEST(CompactionPickerTest, Level1Trigger2) {
   std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
       cf_name, mutable_cf_options, &vstorage, &log_buffer));
   ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1, compaction->num_input_files(0));
-  ASSERT_EQ(2, compaction->num_input_files(1));
+  ASSERT_EQ(1U, compaction->num_input_files(0));
+  ASSERT_EQ(2U, compaction->num_input_files(1));
   ASSERT_EQ(66U, compaction->input(0, 0)->fd.GetNumber());
   ASSERT_EQ(6U, compaction->input(1, 0)->fd.GetNumber());
   ASSERT_EQ(7U, compaction->input(1, 1)->fd.GetNumber());
@@ -164,7 +164,7 @@ TEST(CompactionPickerTest, LevelMaxScore) {
   std::unique_ptr<Compaction> compaction(level_compaction_picker.PickCompaction(
       cf_name, mutable_cf_options, &vstorage, &log_buffer));
   ASSERT_TRUE(compaction.get() != nullptr);
-  ASSERT_EQ(1, compaction->num_input_files(0));
+  ASSERT_EQ(1U, compaction->num_input_files(0));
   ASSERT_EQ(7U, compaction->input(0, 0)->fd.GetNumber());
 }
 

db/comparator_db_test.cc

@@ -82,7 +82,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
     }
 
     int type = rnd->Uniform(2);
-    int index = rnd->Uniform(source_strings.size());
+    int index = rnd->Uniform(static_cast<int>(source_strings.size()));
     auto& key = source_strings[index];
     switch (type) {
       case 0:
@@ -124,7 +124,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
         break;
       case 2: {
         // Seek to random key
-        auto key_idx = rnd->Uniform(source_strings.size());
+        auto key_idx = rnd->Uniform(static_cast<int>(source_strings.size()));
         auto key = source_strings[key_idx];
         iter->Seek(key);
         result_iter->Seek(key);
@@ -150,7 +150,7 @@ void DoRandomIteraratorTest(DB* db, std::vector<std::string> source_strings,
         break;
       default: {
         assert(type == 5);
-        auto key_idx = rnd->Uniform(source_strings.size());
+        auto key_idx = rnd->Uniform(static_cast<int>(source_strings.size()));
         auto key = source_strings[key_idx];
         std::string result;
         auto status = db->Get(ReadOptions(), key, &result);
@@ -325,7 +325,7 @@ TEST(ComparatorDBTest, SimpleSuffixReverseComparator) {
       source_prefixes.push_back(test::RandomHumanReadableString(&rnd, 8));
     }
     for (int j = 0; j < 20; j++) {
-      int prefix_index = rnd.Uniform(source_prefixes.size());
+      int prefix_index = rnd.Uniform(static_cast<int>(source_prefixes.size()));
       std::string key = source_prefixes[prefix_index] +
                         test::RandomHumanReadableString(&rnd, rnd.Uniform(8));
       source_strings.push_back(key);

db/corruption_test.cc

@@ -115,8 +115,8 @@ class CorruptionTest {
         continue;
       }
       missed += (key - next_expected);
-      next_expected = key + 1;
-      if (iter->value() != Value(key, &value_space)) {
+      next_expected = static_cast<unsigned int>(key + 1);
+      if (iter->value() != Value(static_cast<int>(key), &value_space)) {
         bad_values++;
       } else {
         correct++;
@@ -143,14 +143,14 @@ class CorruptionTest {
       if (-offset > sbuf.st_size) {
         offset = 0;
       } else {
-        offset = sbuf.st_size + offset;
+        offset = static_cast<int>(sbuf.st_size + offset);
       }
     }
     if (offset > sbuf.st_size) {
-      offset = sbuf.st_size;
+      offset = static_cast<int>(sbuf.st_size);
     }
     if (offset + bytes_to_corrupt > sbuf.st_size) {
-      bytes_to_corrupt = sbuf.st_size - offset;
+      bytes_to_corrupt = static_cast<int>(sbuf.st_size - offset);
     }
 
     // Do it
@@ -177,7 +177,7 @@ class CorruptionTest {
           type == filetype &&
           static_cast<int>(number) > picked_number) {  // Pick latest file
         fname = dbname_ + "/" + filenames[i];
-        picked_number = number;
+        picked_number = static_cast<int>(number);
       }
     }
     ASSERT_TRUE(!fname.empty()) << filetype;
@@ -246,7 +246,8 @@ TEST(CorruptionTest, RecoverWriteError) {
 TEST(CorruptionTest, NewFileErrorDuringWrite) {
   // Do enough writing to force minor compaction
   env_.writable_file_error_ = true;
-  const int num = 3 + (Options().write_buffer_size / kValueSize);
+  const int num =
+      static_cast<int>(3 + (Options().write_buffer_size / kValueSize));
   std::string value_storage;
   Status s;
   bool failed = false;

db/cuckoo_table_db_test.cc

@@ -92,7 +92,7 @@ class CuckooTableDBTest {
   // Return spread of files per level
   std::string FilesPerLevel() {
     std::string result;
-    int last_non_zero_offset = 0;
+    size_t last_non_zero_offset = 0;
     for (int level = 0; level < db_->NumberLevels(); level++) {
       int f = NumTableFilesAtLevel(level);
       char buf[100];

db/db_bench.cc

@@ -251,7 +251,8 @@ DEFINE_int32(universal_compression_size_percent, -1,
 DEFINE_int64(cache_size, -1, "Number of bytes to use as a cache of uncompressed"
              "data. Negative means use default settings.");
 
-DEFINE_int32(block_size, rocksdb::BlockBasedTableOptions().block_size,
+DEFINE_int32(block_size,
+             static_cast<int32_t>(rocksdb::BlockBasedTableOptions().block_size),
              "Number of bytes in a block.");
 
 DEFINE_int32(block_restart_interval,
@@ -2111,8 +2112,9 @@ class Benchmark {
         for (uint64_t i = 0; i < num_; ++i) {
           values_[i] = i;
         }
-        std::shuffle(values_.begin(), values_.end(),
-            std::default_random_engine(FLAGS_seed));
+        std::shuffle(
+            values_.begin(), values_.end(),
+            std::default_random_engine(static_cast<unsigned int>(FLAGS_seed)));
       }
     }
 

db/db_impl.cc

@@ -2252,7 +2252,7 @@ SuperVersion* DBImpl::InstallSuperVersion(
   MaybeScheduleFlushOrCompaction();
 
   // Update max_total_in_memory_state_
-  auto old_memtable_size = 0;
+  size_t old_memtable_size = 0;
   if (old) {
     old_memtable_size = old->mutable_cf_options.write_buffer_size *
                         old->mutable_cf_options.max_write_buffer_number;
@@ -2920,7 +2920,8 @@ Status DBImpl::DelayWrite(uint64_t expiration_time) {
   auto delay = write_controller_.GetDelay();
   if (write_controller_.IsStopped() == false && delay > 0) {
     mutex_.Unlock();
-    env_->SleepForMicroseconds(delay);
+    // hopefully we don't have to sleep more than 2 billion microseconds
+    env_->SleepForMicroseconds(static_cast<int>(delay));
     mutex_.Lock();
   }
 

db/db_iter_test.cc

@@ -19,7 +19,7 @@
 
 namespace rocksdb {
 
-static uint32_t TestGetTickerCount(const Options& options,
+static uint64_t TestGetTickerCount(const Options& options,
                                    Tickers ticker_type) {
   return options.statistics->getTickerCount(ticker_type);
 }

db/db_test.cc

@@ -668,7 +668,7 @@ class DBTest {
   void CreateColumnFamilies(const std::vector<std::string>& cfs,
                             const Options& options) {
     ColumnFamilyOptions cf_opts(options);
-    int cfi = handles_.size();
+    size_t cfi = handles_.size();
     handles_.resize(cfi + cfs.size());
     for (auto cf : cfs) {
       ASSERT_OK(db_->CreateColumnFamily(cf_opts, cf, &handles_[cfi++]));
@@ -933,7 +933,7 @@ class DBTest {
     int num_levels =
         (cf == 0) ? db_->NumberLevels() : db_->NumberLevels(handles_[1]);
     std::string result;
-    int last_non_zero_offset = 0;
+    size_t last_non_zero_offset = 0;
     for (int level = 0; level < num_levels; level++) {
       int f = NumTableFilesAtLevel(level, cf);
       char buf[100];
@@ -947,7 +947,7 @@ class DBTest {
     return result;
   }
 
-  int CountFiles() {
+  size_t CountFiles() {
     std::vector<std::string> files;
     env_->GetChildren(dbname_, &files);
 
@@ -956,10 +956,10 @@ class DBTest {
       env_->GetChildren(last_options_.wal_dir, &logfiles);
     }
 
-    return static_cast<int>(files.size() + logfiles.size());
+    return files.size() + logfiles.size();
   }
 
-  int CountLiveFiles() {
+  size_t CountLiveFiles() {
     std::vector<LiveFileMetaData> metadata;
     db_->GetLiveFilesMetaData(&metadata);
     return metadata.size();
@@ -4326,7 +4326,8 @@ TEST(DBTest, RepeatedWritesToSameKey) {
         options.num_levels + options.level0_stop_writes_trigger;
 
     Random rnd(301);
-    std::string value = RandomString(&rnd, 2 * options.write_buffer_size);
+    std::string value =
+        RandomString(&rnd, static_cast<int>(2 * options.write_buffer_size));
     for (int i = 0; i < 5 * kMaxFiles; i++) {
       ASSERT_OK(Put(1, "key", value));
       ASSERT_LE(TotalTableFiles(1), kMaxFiles);
@@ -4657,7 +4658,7 @@ TEST(DBTest, CompactionFilterDeletesAll) {
 
   // this will produce empty file (delete compaction filter)
   ASSERT_OK(db_->CompactRange(nullptr, nullptr));
-  ASSERT_EQ(0, CountLiveFiles());
+  ASSERT_EQ(0U, CountLiveFiles());
 
   Reopen(options);
 
@@ -5845,7 +5846,7 @@ TEST(DBTest, DropWrites) {
     ASSERT_OK(Put("foo", "v1"));
     ASSERT_EQ("v1", Get("foo"));
     Compact("a", "z");
-    const int num_files = CountFiles();
+    const size_t num_files = CountFiles();
     // Force out-of-space errors
     env_->drop_writes_.store(true, std::memory_order_release);
     env_->sleep_counter_.Reset();
@@ -6031,7 +6032,7 @@ TEST(DBTest, FilesDeletedAfterCompaction) {
     CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
     ASSERT_OK(Put(1, "foo", "v2"));
     Compact(1, "a", "z");
-    const int num_files = CountLiveFiles();
+    const size_t num_files = CountLiveFiles();
     for (int i = 0; i < 10; i++) {
       ASSERT_OK(Put(1, "foo", "v2"));
       Compact(1, "a", "z");
@@ -6504,7 +6505,7 @@ TEST(DBTest, FlushOneColumnFamily) {
   ASSERT_OK(Put(6, "alyosha", "alyosha"));
   ASSERT_OK(Put(7, "popovich", "popovich"));
 
-  for (size_t i = 0; i < 8; ++i) {
+  for (int i = 0; i < 8; ++i) {
     Flush(i);
     auto tables = ListTableFiles(env_, dbname_);
     ASSERT_EQ(tables.size(), i + 1U);
@@ -6848,8 +6849,8 @@ TEST(DBTest, TransactionLogIteratorCorruptedLog) {
     // than 1025 entries
     auto iter = OpenTransactionLogIter(0);
     int count;
-    int last_sequence_read = ReadRecords(iter, count);
-    ASSERT_LT(last_sequence_read, 1025);
+    SequenceNumber last_sequence_read = ReadRecords(iter, count);
+    ASSERT_LT(last_sequence_read, 1025U);
     // Try to read past the gap, should be able to seek to key1025
     auto iter2 = OpenTransactionLogIter(last_sequence_read + 1);
     ExpectRecords(1, iter2);
@@ -8358,7 +8359,7 @@ TEST(DBTest, CompactFilesOnLevelCompaction) {
 
   ColumnFamilyMetaData cf_meta;
   dbfull()->GetColumnFamilyMetaData(handles_[1], &cf_meta);
-  int output_level = cf_meta.levels.size() - 1;
+  int output_level = static_cast<int>(cf_meta.levels.size()) - 1;
   for (int file_picked = 5; file_picked > 0; --file_picked) {
     std::set<std::string> overlapping_file_names;
     std::vector<std::string> compaction_input_file_names;

db/dbformat.cc

@@ -137,7 +137,8 @@ LookupKey::LookupKey(const Slice& _user_key, SequenceNumber s) {
     dst = new char[needed];
   }
   start_ = dst;
-  dst = EncodeVarint32(dst, usize + 8);
+  // NOTE: We don't support users keys of more than 2GB :)
+  dst = EncodeVarint32(dst, static_cast<uint32_t>(usize + 8));
   kstart_ = dst;
   memcpy(dst, _user_key.data(), usize);
   dst += usize;

db/dbformat.h

@@ -206,13 +206,19 @@ class LookupKey {
   ~LookupKey();
 
   // Return a key suitable for lookup in a MemTable.
-  Slice memtable_key() const { return Slice(start_, end_ - start_); }
+  Slice memtable_key() const {
+    return Slice(start_, static_cast<size_t>(end_ - start_));
+  }
 
   // Return an internal key (suitable for passing to an internal iterator)
-  Slice internal_key() const { return Slice(kstart_, end_ - kstart_); }
+  Slice internal_key() const {
+    return Slice(kstart_, static_cast<size_t>(end_ - kstart_));
+  }
 
   // Return the user key
-  Slice user_key() const { return Slice(kstart_, end_ - kstart_ - 8); }
+  Slice user_key() const {
+    return Slice(kstart_, static_cast<size_t>(end_ - kstart_ - 8));
+  }
 
  private:
   // We construct a char array of the form:
@@ -319,8 +325,8 @@ class IterKey {
 
   void EncodeLengthPrefixedKey(const Slice& key) {
     auto size = key.size();
-    EnlargeBufferIfNeeded(size + VarintLength(size));
-    char* ptr = EncodeVarint32(key_, size);
+    EnlargeBufferIfNeeded(size + static_cast<size_t>(VarintLength(size)));
+    char* ptr = EncodeVarint32(key_, static_cast<uint32_t>(size));
     memcpy(ptr, key.data(), size);
   }
 

db/file_indexer.cc

@@ -17,17 +17,16 @@ namespace rocksdb {
 FileIndexer::FileIndexer(const Comparator* ucmp)
     : num_levels_(0), ucmp_(ucmp), level_rb_(nullptr) {}
 
-uint32_t FileIndexer::NumLevelIndex() const {
-  return next_level_index_.size();
-}
+size_t FileIndexer::NumLevelIndex() const { return next_level_index_.size(); }
 
-uint32_t FileIndexer::LevelIndexSize(uint32_t level) const {
+size_t FileIndexer::LevelIndexSize(size_t level) const {
   return next_level_index_[level].num_index;
 }
 
-void FileIndexer::GetNextLevelIndex(
-    const uint32_t level, const uint32_t file_index, const int cmp_smallest,
-    const int cmp_largest, int32_t* left_bound, int32_t* right_bound) const {
+void FileIndexer::GetNextLevelIndex(const size_t level, const size_t file_index,
+                                    const int cmp_smallest,
+                                    const int cmp_largest, int32_t* left_bound,
+                                    int32_t* right_bound) const {
   assert(level > 0);
 
   // Last level, no hint
@@ -69,7 +68,7 @@ void FileIndexer::GetNextLevelIndex(
   assert(*right_bound <= level_rb_[level + 1]);
 }
 
-void FileIndexer::UpdateIndex(Arena* arena, const uint32_t num_levels,
+void FileIndexer::UpdateIndex(Arena* arena, const size_t num_levels,
                               std::vector<FileMetaData*>* const files) {
   if (files == nullptr) {
     return;
@@ -90,11 +89,11 @@ void FileIndexer::UpdateIndex(Arena* arena, const uint32_t num_levels,
   }
 
   // L1 - Ln-1
-  for (uint32_t level = 1; level < num_levels_ - 1; ++level) {
+  for (size_t level = 1; level < num_levels_ - 1; ++level) {
     const auto& upper_files = files[level];
-    const int32_t upper_size = upper_files.size();
+    const int32_t upper_size = static_cast<int32_t>(upper_files.size());
     const auto& lower_files = files[level + 1];
-    level_rb_[level] = upper_files.size() - 1;
+    level_rb_[level] = static_cast<int32_t>(upper_files.size()) - 1;
     if (upper_size == 0) {
       continue;
     }
@@ -129,7 +128,8 @@ void FileIndexer::UpdateIndex(Arena* arena, const uint32_t num_levels,
         [](IndexUnit* index, int32_t f_idx) { index->largest_rb = f_idx; });
   }
 
-  level_rb_[num_levels_ - 1] = files[num_levels_ - 1].size() - 1;
+  level_rb_[num_levels_ - 1] =
+      static_cast<int32_t>(files[num_levels_ - 1].size()) - 1;
 }
 
 void FileIndexer::CalculateLB(
@@ -137,8 +137,8 @@ void FileIndexer::CalculateLB(
     const std::vector<FileMetaData*>& lower_files, IndexLevel* index_level,
     std::function<int(const FileMetaData*, const FileMetaData*)> cmp_op,
     std::function<void(IndexUnit*, int32_t)> set_index) {
-  const int32_t upper_size = upper_files.size();
-  const int32_t lower_size = lower_files.size();
+  const int32_t upper_size = static_cast<int32_t>(upper_files.size());
+  const int32_t lower_size = static_cast<int32_t>(lower_files.size());
   int32_t upper_idx = 0;
   int32_t lower_idx = 0;
 
@@ -175,8 +175,8 @@ void FileIndexer::CalculateRB(
     const std::vector<FileMetaData*>& lower_files, IndexLevel* index_level,
     std::function<int(const FileMetaData*, const FileMetaData*)> cmp_op,
     std::function<void(IndexUnit*, int32_t)> set_index) {
-  const int32_t upper_size = upper_files.size();
-  const int32_t lower_size = lower_files.size();
+  const int32_t upper_size = static_cast<int32_t>(upper_files.size());
+  const int32_t lower_size = static_cast<int32_t>(lower_files.size());
   int32_t upper_idx = upper_size - 1;
   int32_t lower_idx = lower_size - 1;
 

db/file_indexer.h

@@ -42,19 +42,19 @@ class FileIndexer {
  public:
   explicit FileIndexer(const Comparator* ucmp);
 
-  uint32_t NumLevelIndex() const;
+  size_t NumLevelIndex() const;
 
-  uint32_t LevelIndexSize(uint32_t level) const;
+  size_t LevelIndexSize(size_t level) const;
 
   // Return a file index range in the next level to search for a key based on
   // smallest and largest key comparision for the current file specified by
   // level and file_index. When *left_index < *right_index, both index should
   // be valid and fit in the vector size.
-  void GetNextLevelIndex(
-    const uint32_t level, const uint32_t file_index, const int cmp_smallest,
-    const int cmp_largest, int32_t* left_bound, int32_t* right_bound) const;
+  void GetNextLevelIndex(const size_t level, const size_t file_index,
+                         const int cmp_smallest, const int cmp_largest,
+                         int32_t* left_bound, int32_t* right_bound) const;
 
-  void UpdateIndex(Arena* arena, const uint32_t num_levels,
+  void UpdateIndex(Arena* arena, const size_t num_levels,
                    std::vector<FileMetaData*>* const files);
 
   enum {
@@ -62,7 +62,7 @@ class FileIndexer {
   };
 
  private:
-  uint32_t num_levels_;
+  size_t num_levels_;
   const Comparator* ucmp_;
 
   struct IndexUnit {

db/file_indexer_test.cc

@@ -22,8 +22,15 @@ class IntComparator : public Comparator {
   int Compare(const Slice& a, const Slice& b) const {
     assert(a.size() == 8);
     assert(b.size() == 8);
-    return *reinterpret_cast<const int64_t*>(a.data()) -
+    int64_t diff = *reinterpret_cast<const int64_t*>(a.data()) -
                    *reinterpret_cast<const int64_t*>(b.data());
+    if (diff < 0) {
+      return -1;
+    } else if (diff == 0) {
+      return 0;
+    } else {
+      return 1;
+    }
   }
 
   const char* Name() const {

db/flush_job.cc

@@ -150,9 +150,9 @@ Status FlushJob::WriteLevel0Table(const autovector<MemTable*>& mems,
       memtables.push_back(m->NewIterator(ro, &arena));
     }
     {
-      ScopedArenaIterator iter(NewMergingIterator(&cfd_->internal_comparator(),
-                                                  &memtables[0],
-                                                  memtables.size(), &arena));
+      ScopedArenaIterator iter(
+          NewMergingIterator(&cfd_->internal_comparator(), &memtables[0],
+                             static_cast<int>(memtables.size()), &arena));
       Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
           "[%s] Level-0 flush table #%" PRIu64 ": started",
           cfd_->GetName().c_str(), meta.fd.GetNumber());

db/forward_iterator.cc

@@ -264,10 +264,11 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
         if (search_left_bound == search_right_bound) {
           f_idx = search_left_bound;
         } else if (search_left_bound < search_right_bound) {
-          f_idx = FindFileInRange(
-              level_files, internal_key, search_left_bound,
-              search_right_bound == FileIndexer::kLevelMaxIndex ?
-                level_files.size() : search_right_bound);
+          f_idx =
+              FindFileInRange(level_files, internal_key, search_left_bound,
+                              search_right_bound == FileIndexer::kLevelMaxIndex
+                                  ? static_cast<uint32_t>(level_files.size())
+                                  : search_right_bound);
         } else {
           // search_left_bound > search_right_bound
           // There are only 2 cases this can happen:

db/listener_test.cc

@@ -59,7 +59,7 @@ class EventListenerTest {
                             const ColumnFamilyOptions* options = nullptr) {
     ColumnFamilyOptions cf_opts;
     cf_opts = ColumnFamilyOptions(Options());
-    int cfi = handles_.size();
+    size_t cfi = handles_.size();
     handles_.resize(cfi + cfs.size());
     for (auto cf : cfs) {
       ASSERT_OK(db_->CreateColumnFamily(cf_opts, cf, &handles_[cfi++]));
@@ -188,7 +188,7 @@ TEST(EventListenerTest, OnSingleDBFlushTest) {
   ASSERT_OK(Put(6, "alyosha", "alyosha"));
   ASSERT_OK(Put(7, "popovich", "popovich"));
   for (size_t i = 1; i < 8; ++i) {
-    Flush(i);
+    Flush(static_cast<int>(i));
     dbfull()->TEST_WaitForFlushMemTable();
     ASSERT_EQ(listener->flushed_dbs_.size(), i);
     ASSERT_EQ(listener->flushed_column_family_names_.size(), i);
@@ -218,7 +218,7 @@ TEST(EventListenerTest, MultiCF) {
   ASSERT_OK(Put(6, "alyosha", "alyosha"));
   ASSERT_OK(Put(7, "popovich", "popovich"));
   for (size_t i = 1; i < 8; ++i) {
-    Flush(i);
+    Flush(static_cast<int>(i));
     ASSERT_EQ(listener->flushed_dbs_.size(), i);
     ASSERT_EQ(listener->flushed_column_family_names_.size(), i);
   }

db/log_and_apply_bench.cc

@@ -6,6 +6,11 @@
 
 #include <vector>
 
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+#include <inttypes.h>
 #include "util/testharness.h"
 #include "util/benchharness.h"
 #include "db/version_set.h"
@@ -14,9 +19,9 @@
 
 namespace rocksdb {
 
-std::string MakeKey(unsigned int num) {
+std::string MakeKey(uint64_t num) {
   char buf[30];
-  snprintf(buf, sizeof(buf), "%016u", num);
+  snprintf(buf, sizeof(buf), "%016" PRIu64, num);
   return std::string(buf);
 }
 

db/log_test.cc

@@ -558,9 +558,9 @@ TEST(LogTest, ErrorJoinsRecords) {
 
   ASSERT_EQ("correct", Read());
   ASSERT_EQ("EOF", Read());
-  const unsigned int dropped = DroppedBytes();
-  ASSERT_LE(dropped, 2*kBlockSize + 100);
-  ASSERT_GE(dropped, 2*kBlockSize);
+  size_t dropped = DroppedBytes();
+  ASSERT_LE(dropped, 2 * kBlockSize + 100);
+  ASSERT_GE(dropped, 2 * kBlockSize);
 }
 
 TEST(LogTest, ReadStart) {

db/memtable.cc

@@ -188,7 +188,7 @@ KeyHandle MemTableRep::Allocate(const size_t len, char** buf) {
 // into this scratch space.
 const char* EncodeKey(std::string* scratch, const Slice& target) {
   scratch->clear();
-  PutVarint32(scratch, target.size());
+  PutVarint32(scratch, static_cast<uint32_t>(target.size()));
   scratch->append(target.data(), target.size());
   return scratch->data();
 }
@@ -288,12 +288,12 @@ void MemTable::Add(SequenceNumber s, ValueType type,
   //  key bytes    : char[internal_key.size()]
   //  value_size   : varint32 of value.size()
   //  value bytes  : char[value.size()]
-  size_t key_size = key.size();
-  size_t val_size = value.size();
-  size_t internal_key_size = key_size + 8;
-  const size_t encoded_len =
-      VarintLength(internal_key_size) + internal_key_size +
-      VarintLength(val_size) + val_size;
+  uint32_t key_size = static_cast<uint32_t>(key.size());
+  uint32_t val_size = static_cast<uint32_t>(value.size());
+  uint32_t internal_key_size = key_size + 8;
+  const uint32_t encoded_len = VarintLength(internal_key_size) +
+                               internal_key_size + VarintLength(val_size) +
+                               val_size;
   char* buf = nullptr;
   KeyHandle handle = table_->Allocate(encoded_len, &buf);
   assert(buf != nullptr);
@@ -502,8 +502,8 @@ void MemTable::Update(SequenceNumber seq,
       switch (static_cast<ValueType>(tag & 0xff)) {
         case kTypeValue: {
           Slice prev_value = GetLengthPrefixedSlice(key_ptr + key_length);
-          uint32_t prev_size = prev_value.size();
-          uint32_t new_size = value.size();
+          uint32_t prev_size = static_cast<uint32_t>(prev_value.size());
+          uint32_t new_size = static_cast<uint32_t>(value.size());
 
           // Update value, if new value size  <= previous value size
           if (new_size <= prev_size ) {
@@ -560,7 +560,7 @@ bool MemTable::UpdateCallback(SequenceNumber seq,
       switch (static_cast<ValueType>(tag & 0xff)) {
         case kTypeValue: {
           Slice prev_value = GetLengthPrefixedSlice(key_ptr + key_length);
-          uint32_t  prev_size = prev_value.size();
+          uint32_t prev_size = static_cast<uint32_t>(prev_value.size());
 
           char* prev_buffer = const_cast<char*>(prev_value.data());
           uint32_t new_prev_size = prev_size;

db/merge_test.cc

@@ -23,15 +23,11 @@ using namespace std;
 using namespace rocksdb;
 
 namespace {
-  int numMergeOperatorCalls;
-  void resetNumMergeOperatorCalls() {
-    numMergeOperatorCalls = 0;
-  }
+size_t num_merge_operator_calls;
+void resetNumMergeOperatorCalls() { num_merge_operator_calls = 0; }
 
-  int num_partial_merge_calls;
-  void resetNumPartialMergeCalls() {
-    num_partial_merge_calls = 0;
-  }
+size_t num_partial_merge_calls;
+void resetNumPartialMergeCalls() { num_partial_merge_calls = 0; }
 }
 
 class CountMergeOperator : public AssociativeMergeOperator {
@@ -45,7 +41,7 @@ class CountMergeOperator : public AssociativeMergeOperator {
                      const Slice& value,
                      std::string* new_value,
                      Logger* logger) const override {
-    ++numMergeOperatorCalls;
+    ++num_merge_operator_calls;
     if (existing_value == nullptr) {
       new_value->assign(value.data(), value.size());
       return true;
@@ -307,31 +303,31 @@ void testCounters(Counters& counters, DB* db, bool test_compaction) {
   }
 }
 
-void testSuccessiveMerge(
-    Counters& counters, int max_num_merges, int num_merges) {
+void testSuccessiveMerge(Counters& counters, size_t max_num_merges,
+                         size_t num_merges) {
 
   counters.assert_remove("z");
   uint64_t sum = 0;
 
-  for (int i = 1; i <= num_merges; ++i) {
+  for (size_t i = 1; i <= num_merges; ++i) {
     resetNumMergeOperatorCalls();
     counters.assert_add("z", i);
     sum += i;
 
     if (i % (max_num_merges + 1) == 0) {
-      assert(numMergeOperatorCalls == max_num_merges + 1);
+      assert(num_merge_operator_calls == max_num_merges + 1);
     } else {
-      assert(numMergeOperatorCalls == 0);
+      assert(num_merge_operator_calls == 0);
     }
 
     resetNumMergeOperatorCalls();
     assert(counters.assert_get("z") == sum);
-    assert(numMergeOperatorCalls == i % (max_num_merges + 1));
+    assert(num_merge_operator_calls == i % (max_num_merges + 1));
   }
 }
 
-void testPartialMerge(Counters* counters, DB* db, int max_merge, int min_merge,
-                      int count) {
+void testPartialMerge(Counters* counters, DB* db, size_t max_merge,
+                      size_t min_merge, size_t count) {
   FlushOptions o;
   o.wait = true;
 
@@ -339,7 +335,7 @@ void testPartialMerge(Counters* counters, DB* db, int max_merge, int min_merge,
   //              operands exceeds the threshold.
   uint64_t tmp_sum = 0;
   resetNumPartialMergeCalls();
-  for (int i = 1; i <= count; i++) {
+  for (size_t i = 1; i <= count; i++) {
     counters->assert_add("b", i);
     tmp_sum += i;
   }
@@ -348,7 +344,7 @@ void testPartialMerge(Counters* counters, DB* db, int max_merge, int min_merge,
   ASSERT_EQ(tmp_sum, counters->assert_get("b"));
   if (count > max_merge) {
     // in this case, FullMerge should be called instead.
-    ASSERT_EQ(num_partial_merge_calls, 0);
+    ASSERT_EQ(num_partial_merge_calls, 0U);
   } else {
     // if count >= min_merge, then partial merge should be called once.
     ASSERT_EQ((count >= min_merge), (num_partial_merge_calls == 1));
@@ -358,20 +354,18 @@ void testPartialMerge(Counters* counters, DB* db, int max_merge, int min_merge,
   resetNumPartialMergeCalls();
   tmp_sum = 0;
   db->Put(rocksdb::WriteOptions(), "c", "10");
-  for (int i = 1; i <= count; i++) {
+  for (size_t i = 1; i <= count; i++) {
     counters->assert_add("c", i);
     tmp_sum += i;
   }
   db->Flush(o);
   db->CompactRange(nullptr, nullptr);
   ASSERT_EQ(tmp_sum, counters->assert_get("c"));
-  ASSERT_EQ(num_partial_merge_calls, 0);
+  ASSERT_EQ(num_partial_merge_calls, 0U);
 }
 
-void testSingleBatchSuccessiveMerge(
-    DB* db,
-    int max_num_merges,
-    int num_merges) {
+void testSingleBatchSuccessiveMerge(DB* db, size_t max_num_merges,
+                                    size_t num_merges) {
   assert(num_merges > max_num_merges);
 
   Slice key("BatchSuccessiveMerge");
@@ -380,7 +374,7 @@ void testSingleBatchSuccessiveMerge(
 
   // Create the batch
   WriteBatch batch;
-  for (int i = 0; i < num_merges; ++i) {
+  for (size_t i = 0; i < num_merges; ++i) {
     batch.Merge(key, merge_value_slice);
   }
 
@@ -390,8 +384,9 @@ void testSingleBatchSuccessiveMerge(
     Status s = db->Write(WriteOptions(), &batch);
     assert(s.ok());
   }
-  assert(numMergeOperatorCalls ==
-      num_merges - (num_merges % (max_num_merges + 1)));
+  ASSERT_EQ(
+      num_merge_operator_calls,
+      static_cast<size_t>(num_merges - (num_merges % (max_num_merges + 1))));
 
   // Get the value
   resetNumMergeOperatorCalls();
@@ -403,7 +398,8 @@ void testSingleBatchSuccessiveMerge(
   assert(get_value_str.size() == sizeof(uint64_t));
   uint64_t get_value = DecodeFixed64(&get_value_str[0]);
   ASSERT_EQ(get_value, num_merges * merge_value);
-  ASSERT_EQ(numMergeOperatorCalls, (num_merges % (max_num_merges + 1)));
+  ASSERT_EQ(num_merge_operator_calls,
+            static_cast<size_t>((num_merges % (max_num_merges + 1))));
 }
 
 void runTest(int argc, const string& dbname, const bool use_ttl = false) {

db/plain_table_db_test.cc

@@ -158,7 +158,7 @@ class PlainTableDBTest {
   // Return spread of files per level
   std::string FilesPerLevel() {
     std::string result;
-    int last_non_zero_offset = 0;
+    size_t last_non_zero_offset = 0;
     for (int level = 0; level < db_->NumberLevels(); level++) {
       int f = NumTableFilesAtLevel(level);
       char buf[100];

db/prefix_test.cc

@@ -29,14 +29,14 @@ using GFLAGS::ParseCommandLineFlags;
 
 DEFINE_bool(trigger_deadlock, false,
             "issue delete in range scan to trigger PrefixHashMap deadlock");
-DEFINE_uint64(bucket_count, 100000, "number of buckets");
+DEFINE_int32(bucket_count, 100000, "number of buckets");
 DEFINE_uint64(num_locks, 10001, "number of locks");
 DEFINE_bool(random_prefix, false, "randomize prefix");
 DEFINE_uint64(total_prefixes, 100000, "total number of prefixes");
 DEFINE_uint64(items_per_prefix, 1, "total number of values per prefix");
 DEFINE_int64(write_buffer_size, 33554432, "");
-DEFINE_int64(max_write_buffer_number, 2, "");
-DEFINE_int64(min_write_buffer_number_to_merge, 1, "");
+DEFINE_int32(max_write_buffer_number, 2, "");
+DEFINE_int32(min_write_buffer_number_to_merge, 1, "");
 DEFINE_int32(skiplist_height, 4, "");
 DEFINE_int32(memtable_prefix_bloom_bits, 10000000, "");
 DEFINE_int32(memtable_prefix_bloom_probes, 10, "");

db/skiplist_test.cc

@@ -253,11 +253,10 @@ class ConcurrentTest {
         // Note that generation 0 is never inserted, so it is ok if
         // <*,0,*> is missing.
         ASSERT_TRUE((gen(pos) == 0U) ||
-                    (gen(pos) > (uint64_t)initial_state.Get(key(pos)))
-                    ) << "key: " << key(pos)
-                      << "; gen: " << gen(pos)
-                      << "; initgen: "
-                      << initial_state.Get(key(pos));
+                    (gen(pos) > static_cast<uint64_t>(initial_state.Get(
+                                    static_cast<int>(key(pos))))))
+            << "key: " << key(pos) << "; gen: " << gen(pos)
+            << "; initgen: " << initial_state.Get(static_cast<int>(key(pos)));
 
         // Advance to next key in the valid key space
         if (key(pos) < key(current)) {

db/version_edit.h

@@ -160,7 +160,7 @@ class VersionEdit {
   // Add the specified file at the specified number.
   // REQUIRES: This version has not been saved (see VersionSet::SaveTo)
   // REQUIRES: "smallest" and "largest" are smallest and largest keys in file
-  void AddFile(int level, uint64_t file, uint64_t file_path_id,
+  void AddFile(int level, uint64_t file, uint32_t file_path_id,
                uint64_t file_size, const InternalKey& smallest,
                const InternalKey& largest, const SequenceNumber& smallest_seqno,
                const SequenceNumber& largest_seqno) {
@@ -180,9 +180,7 @@ class VersionEdit {
   }
 
   // Number of edits
-  int NumEntries() {
-    return new_files_.size() + deleted_files_.size();
-  }
+  size_t NumEntries() { return new_files_.size() + deleted_files_.size(); }
 
   bool IsColumnFamilyManipulation() {
     return is_column_family_add_ || is_column_family_drop_;

db/version_edit_test.cc

@@ -26,11 +26,12 @@ class VersionEditTest { };
 
 TEST(VersionEditTest, EncodeDecode) {
   static const uint64_t kBig = 1ull << 50;
+  static const uint32_t kBig32Bit = 1ull << 30;
 
   VersionEdit edit;
   for (int i = 0; i < 4; i++) {
     TestEncodeDecode(edit);
-    edit.AddFile(3, kBig + 300 + i, kBig + 400 + i, 0,
+    edit.AddFile(3, kBig + 300 + i, kBig32Bit + 400 + i, 0,
                  InternalKey("foo", kBig + 500 + i, kTypeValue),
                  InternalKey("zoo", kBig + 600 + i, kTypeDeletion),
                  kBig + 500 + i, kBig + 600 + i);

db/version_set.cc

@@ -201,8 +201,8 @@ class FilePicker {
  private:
   unsigned int num_levels_;
   unsigned int curr_level_;
-  int search_left_bound_;
-  int search_right_bound_;
+  int32_t search_left_bound_;
+  int32_t search_right_bound_;
 #ifndef NDEBUG
   std::vector<FileMetaData*>* files_;
 #endif
@@ -258,11 +258,13 @@ class FilePicker {
           start_index = search_left_bound_;
         } else if (search_left_bound_ < search_right_bound_) {
           if (search_right_bound_ == FileIndexer::kLevelMaxIndex) {
-            search_right_bound_ = curr_file_level_->num_files - 1;
+            search_right_bound_ =
+                static_cast<int32_t>(curr_file_level_->num_files) - 1;
           }
-          start_index = FindFileInRange(*internal_comparator_,
-              *curr_file_level_, ikey_,
-              search_left_bound_, search_right_bound_);
+          start_index =
+              FindFileInRange(*internal_comparator_, *curr_file_level_, ikey_,
+                              static_cast<uint32_t>(search_left_bound_),
+                              static_cast<uint32_t>(search_right_bound_));
         } else {
           // search_left_bound > search_right_bound, key does not exist in
           // this level. Since no comparision is done in this level, it will
@@ -315,7 +317,8 @@ Version::~Version() {
 int FindFile(const InternalKeyComparator& icmp,
              const LevelFilesBrief& file_level,
              const Slice& key) {
-  return FindFileInRange(icmp, file_level, key, 0, file_level.num_files);
+  return FindFileInRange(icmp, file_level, key, 0,
+                         static_cast<uint32_t>(file_level.num_files));
 }
 
 void DoGenerateLevelFilesBrief(LevelFilesBrief* file_level,
@@ -412,7 +415,7 @@ class LevelFileNumIterator : public Iterator {
                        const LevelFilesBrief* flevel)
       : icmp_(icmp),
         flevel_(flevel),
-        index_(flevel->num_files),
+        index_(static_cast<uint32_t>(flevel->num_files)),
         current_value_(0, 0, 0) {  // Marks as invalid
   }
   virtual bool Valid() const {
@@ -423,7 +426,9 @@ class LevelFileNumIterator : public Iterator {
   }
   virtual void SeekToFirst() { index_ = 0; }
   virtual void SeekToLast() {
-    index_ = (flevel_->num_files == 0) ? 0 : flevel_->num_files - 1;
+    index_ = (flevel_->num_files == 0)
+                 ? 0
+                 : static_cast<uint32_t>(flevel_->num_files) - 1;
   }
   virtual void Next() {
     assert(Valid());
@@ -432,7 +437,7 @@ class LevelFileNumIterator : public Iterator {
   virtual void Prev() {
     assert(Valid());
     if (index_ == 0) {
-      index_ = flevel_->num_files;  // Marks as invalid
+      index_ = static_cast<uint32_t>(flevel_->num_files);  // Marks as invalid
     } else {
       index_--;
     }
@@ -1213,7 +1218,7 @@ void VersionStorageInfo::GetOverlappingInputs(
           i = 0;
         }
       } else if (file_index) {
-        *file_index = i-1;
+        *file_index = static_cast<int>(i) - 1;
       }
     }
   }
@@ -1229,7 +1234,7 @@ void VersionStorageInfo::GetOverlappingInputsBinarySearch(
   assert(level > 0);
   int min = 0;
   int mid = 0;
-  int max = files_[level].size() -1;
+  int max = static_cast<int>(files_[level].size()) - 1;
   bool foundOverlap = false;
   const Comparator* user_cmp = user_comparator_;
 
@@ -2646,12 +2651,12 @@ Iterator* VersionSet::MakeInputIterator(Compaction* c) {
   // Level-0 files have to be merged together.  For other levels,
   // we will make a concatenating iterator per level.
   // TODO(opt): use concatenating iterator for level-0 if there is no overlap
-  const int space = (c->level() == 0 ?
-      c->input_levels(0)->num_files + c->num_input_levels() - 1:
-      c->num_input_levels());
-  Iterator** list = new Iterator*[space];
-  int num = 0;
-  for (int which = 0; which < c->num_input_levels(); which++) {
+  const size_t space = (c->level() == 0 ? c->input_levels(0)->num_files +
+                                              c->num_input_levels() - 1
+                                        : c->num_input_levels());
+  Iterator** list = new Iterator* [space];
+  size_t num = 0;
+  for (size_t which = 0; which < c->num_input_levels(); which++) {
     if (c->input_levels(which)->num_files != 0) {
       if (c->level(which) == 0) {
         const LevelFilesBrief* flevel = c->input_levels(which);
@@ -2673,8 +2678,9 @@ Iterator* VersionSet::MakeInputIterator(Compaction* c) {
     }
   }
   assert(num <= space);
-  Iterator* result = NewMergingIterator(
-      &c->column_family_data()->internal_comparator(), list, num);
+  Iterator* result =
+      NewMergingIterator(&c->column_family_data()->internal_comparator(), list,
+                         static_cast<int>(num));
   delete[] list;
   return result;
 }
@@ -2691,9 +2697,9 @@ bool VersionSet::VerifyCompactionFileConsistency(Compaction* c) {
         c->column_family_data()->GetName().c_str());
   }
 
-  for (int input = 0; input < c->num_input_levels(); ++input) {
+  for (size_t input = 0; input < c->num_input_levels(); ++input) {
     int level = c->level(input);
-    for (int i = 0; i < c->num_input_files(input); ++i) {
+    for (size_t i = 0; i < c->num_input_files(input); ++i) {
       uint64_t number = c->input(input, i)->fd.GetNumber();
       bool found = false;
       for (unsigned int j = 0; j < vstorage->files_[level].size(); j++) {

db/version_set.h

@@ -194,7 +194,7 @@ class VersionStorageInfo {
   // REQUIRES: This version has been saved (see VersionSet::SaveTo)
   int NumLevelFiles(int level) const {
     assert(finalized_);
-    return files_[level].size();
+    return static_cast<int>(files_[level].size());
   }
 
   // Return the combined file size of all files at the specified level.

db/write_batch.cc

@@ -374,7 +374,7 @@ class MemTableInserter : public WriteBatch::Handler {
         Status s = db_->Get(ropts, cf_handle, key, &prev_value);
 
         char* prev_buffer = const_cast<char*>(prev_value.c_str());
-        uint32_t prev_size = prev_value.size();
+        uint32_t prev_size = static_cast<uint32_t>(prev_value.size());
         auto status = moptions->inplace_callback(s.ok() ? prev_buffer : nullptr,
                                                  s.ok() ? &prev_size : nullptr,
                                                  value, &merged_value);

include/rocksdb/env.h

@@ -20,6 +20,7 @@
 #include <cstdarg>
 #include <string>
 #include <memory>
+#include <limits>
 #include <vector>
 #include <stdint.h>
 #include "rocksdb/status.h"
@@ -476,8 +477,8 @@ class WritableFile {
     if (new_last_preallocated_block > last_preallocated_block_) {
       size_t num_spanned_blocks =
         new_last_preallocated_block - last_preallocated_block_;
-      Allocate(block_size * last_preallocated_block_,
-               block_size * num_spanned_blocks);
+      Allocate(static_cast<off_t>(block_size * last_preallocated_block_),
+               static_cast<off_t>(block_size * num_spanned_blocks));
       last_preallocated_block_ = new_last_preallocated_block;
     }
   }
@@ -580,7 +581,8 @@ enum InfoLogLevel : unsigned char {
 // An interface for writing log messages.
 class Logger {
  public:
-  enum { DO_NOT_SUPPORT_GET_LOG_FILE_SIZE = -1 };
+  size_t kDoNotSupportGetLogFileSize = std::numeric_limits<size_t>::max();
+
   explicit Logger(const InfoLogLevel log_level = InfoLogLevel::INFO_LEVEL)
       : log_level_(log_level) {}
   virtual ~Logger();
@@ -613,9 +615,7 @@ class Logger {
       Logv(new_format, ap);
     }
   }
-  virtual size_t GetLogFileSize() const {
-    return DO_NOT_SUPPORT_GET_LOG_FILE_SIZE;
-  }
+  virtual size_t GetLogFileSize() const { return kDoNotSupportGetLogFileSize; }
   // Flush to the OS buffers
   virtual void Flush() {}
   virtual InfoLogLevel GetInfoLogLevel() const { return log_level_; }

java/rocksjni/iterator.cc

@@ -74,9 +74,8 @@ jbyteArray Java_org_rocksdb_RocksIterator_key0(
   auto it = reinterpret_cast<rocksdb::Iterator*>(handle);
   rocksdb::Slice key_slice = it->key();
 
-  jbyteArray jkey = env->NewByteArray(key_slice.size());
-  env->SetByteArrayRegion(
-      jkey, 0, key_slice.size(),
+  jbyteArray jkey = env->NewByteArray(static_cast<jsize>(key_slice.size()));
+  env->SetByteArrayRegion(jkey, 0, static_cast<jsize>(key_slice.size()),
                           reinterpret_cast<const jbyte*>(key_slice.data()));
   return jkey;
 }
@@ -91,9 +90,9 @@ jbyteArray Java_org_rocksdb_RocksIterator_value0(
   auto it = reinterpret_cast<rocksdb::Iterator*>(handle);
   rocksdb::Slice value_slice = it->value();
 
-  jbyteArray jkeyValue = env->NewByteArray(value_slice.size());
-  env->SetByteArrayRegion(
-      jkeyValue, 0, value_slice.size(),
+  jbyteArray jkeyValue =
+      env->NewByteArray(static_cast<jsize>(value_slice.size()));
+  env->SetByteArrayRegion(jkeyValue, 0, static_cast<jsize>(value_slice.size()),
                           reinterpret_cast<const jbyte*>(value_slice.data()));
   return jkeyValue;
 }

java/rocksjni/restorejni.cc

@@ -65,8 +65,8 @@ void Java_org_rocksdb_RestoreBackupableDB_restoreDBFromBackup0(JNIEnv* env,
   const char* cwal_dir = env->GetStringUTFChars(jwal_dir, 0);
 
   auto rdb = reinterpret_cast<rocksdb::RestoreBackupableDB*>(jhandle);
-  rocksdb::Status s =
-      rdb->RestoreDBFromBackup(jbackup_id, cdb_dir, cwal_dir, *opt);
+  rocksdb::Status s = rdb->RestoreDBFromBackup(
+      static_cast<rocksdb::BackupID>(jbackup_id), cdb_dir, cwal_dir, *opt);
 
   env->ReleaseStringUTFChars(jdb_dir, cdb_dir);
   env->ReleaseStringUTFChars(jwal_dir, cwal_dir);

java/rocksjni/rocksjni.cc

@@ -234,9 +234,9 @@ jobject Java_org_rocksdb_RocksDB_listColumnFamilies(
     for (std::vector<std::string>::size_type i = 0;
         i < column_family_names.size(); i++) {
       jbyteArray jcf_value =
-          env->NewByteArray(column_family_names[i].size());
-      env->SetByteArrayRegion(jcf_value, 0,
-          column_family_names[i].size(),
+          env->NewByteArray(static_cast<jsize>(column_family_names[i].size()));
+      env->SetByteArrayRegion(
+          jcf_value, 0, static_cast<jsize>(column_family_names[i].size()),
           reinterpret_cast<const jbyte*>(column_family_names[i].c_str()));
       env->CallBooleanMethod(jvalue_list,
           rocksdb::ListJni::getListAddMethodId(env), jcf_value);
@@ -516,9 +516,8 @@ jbyteArray rocksdb_get_helper(
   }
 
   if (s.ok()) {
-    jbyteArray jret_value = env->NewByteArray(value.size());
-    env->SetByteArrayRegion(
-        jret_value, 0, value.size(),
+    jbyteArray jret_value = env->NewByteArray(static_cast<jsize>(value.size()));
+    env->SetByteArrayRegion(jret_value, 0, static_cast<jsize>(value.size()),
                             reinterpret_cast<const jbyte*>(value.c_str()));
     return jret_value;
   }
@@ -712,9 +711,10 @@ jobject multi_get_helper(JNIEnv* env, jobject jdb, rocksdb::DB* db,
   // insert in java list
   for (std::vector<rocksdb::Status>::size_type i = 0; i != s.size(); i++) {
     if (s[i].ok()) {
-      jbyteArray jentry_value = env->NewByteArray(values[i].size());
+      jbyteArray jentry_value =
+          env->NewByteArray(static_cast<jsize>(values[i].size()));
       env->SetByteArrayRegion(
-          jentry_value, 0, values[i].size(),
+          jentry_value, 0, static_cast<jsize>(values[i].size()),
           reinterpret_cast<const jbyte*>(values[i].c_str()));
       env->CallBooleanMethod(
           jvalue_list, rocksdb::ListJni::getListAddMethodId(env),
@@ -1135,10 +1135,11 @@ jlongArray Java_org_rocksdb_RocksDB_iterators(
   rocksdb::Status s = db->NewIterators(rocksdb::ReadOptions(),
       cf_handles, &iterators);
   if (s.ok()) {
-    jlongArray jLongArray = env->NewLongArray(iterators.size());
-    for (std::vector<rocksdb::Iterator*>::size_type i = 0;
-        i < iterators.size(); i++) {
-      env->SetLongArrayRegion(jLongArray, i, 1,
+    jlongArray jLongArray =
+        env->NewLongArray(static_cast<jsize>(iterators.size()));
+    for (std::vector<rocksdb::Iterator*>::size_type i = 0; i < iterators.size();
+         i++) {
+      env->SetLongArrayRegion(jLongArray, static_cast<jsize>(i), 1,
                               reinterpret_cast<const jlong*>(&iterators[i]));
     }
     return jLongArray;

java/rocksjni/slice.cc

@@ -39,7 +39,7 @@ void Java_org_rocksdb_AbstractSlice_createNewSliceFromString(
 jint Java_org_rocksdb_AbstractSlice_size0(
     JNIEnv* env, jobject jobj, jlong handle) {
   const rocksdb::Slice* slice = reinterpret_cast<rocksdb::Slice*>(handle);
-  return slice->size();
+  return static_cast<jint>(slice->size());
 }
 
 /*
@@ -154,7 +154,7 @@ void Java_org_rocksdb_Slice_createNewSlice1(
 jbyteArray Java_org_rocksdb_Slice_data0(
     JNIEnv* env, jobject jobj, jlong handle) {
   const rocksdb::Slice* slice = reinterpret_cast<rocksdb::Slice*>(handle);
-  const int len = slice->size();
+  const int len = static_cast<int>(slice->size());
   const jbyteArray data = env->NewByteArray(len);
   env->SetByteArrayRegion(data, 0, len,
     reinterpret_cast<jbyte*>(const_cast<char*>(slice->data())));

java/rocksjni/write_batch.cc

@@ -392,9 +392,8 @@ jbyteArray Java_org_rocksdb_WriteBatchTest_getContents(
   }
   delete mem->Unref();
 
-  jbyteArray jstate = env->NewByteArray(state.size());
-  env->SetByteArrayRegion(
-      jstate, 0, state.size(),
+  jbyteArray jstate = env->NewByteArray(static_cast<jsize>(state.size()));
+  env->SetByteArrayRegion(jstate, 0, static_cast<jsize>(state.size()),
                           reinterpret_cast<const jbyte*>(state.c_str()));
 
   return jstate;

port/port_posix.h

@@ -203,13 +203,13 @@ inline bool Zlib_Compress(const CompressionOptions& opts, const char* input,
 
   // Compress the input, and put compressed data in output.
   _stream.next_in = (Bytef *)input;
-  _stream.avail_in = length;
+  _stream.avail_in = static_cast<unsigned int>(length);
 
   // Initialize the output size.
-  _stream.avail_out = length;
-  _stream.next_out = (Bytef *)&(*output)[0];
+  _stream.avail_out = static_cast<unsigned int>(length);
+  _stream.next_out = (Bytef*)&(*output)[0];
 
-  int old_sz =0, new_sz =0, new_sz_delta =0;
+  size_t old_sz = 0, new_sz = 0, new_sz_delta = 0;
   bool done = false;
   while (!done) {
     st = deflate(&_stream, Z_FINISH);
@@ -221,12 +221,12 @@ inline bool Zlib_Compress(const CompressionOptions& opts, const char* input,
         // No output space. Increase the output space by 20%.
         // (Should we fail the compression since it expands the size?)
         old_sz = output->size();
-        new_sz_delta = (int)(output->size() * 0.2);
+        new_sz_delta = static_cast<size_t>(output->size() * 0.2);
         new_sz = output->size() + (new_sz_delta < 10 ? 10 : new_sz_delta);
         output->resize(new_sz);
         // Set more output.
         _stream.next_out = (Bytef *)&(*output)[old_sz];
-        _stream.avail_out = new_sz - old_sz;
+        _stream.avail_out = static_cast<unsigned int>(new_sz - old_sz);
         break;
       case Z_BUF_ERROR:
       default:
@@ -258,18 +258,18 @@ inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
   }
 
   _stream.next_in = (Bytef *)input_data;
-  _stream.avail_in = input_length;
+  _stream.avail_in = static_cast<unsigned int>(input_length);
 
   // Assume the decompressed data size will 5x of compressed size.
-  int output_len = input_length * 5;
+  size_t output_len = input_length * 5;
   char* output = new char[output_len];
-  int old_sz = output_len;
+  size_t old_sz = output_len;
 
   _stream.next_out = (Bytef *)output;
-  _stream.avail_out = output_len;
+  _stream.avail_out = static_cast<unsigned int>(output_len);
 
   char* tmp = nullptr;
-  int output_len_delta;
+  size_t output_len_delta;
   bool done = false;
 
   //while(_stream.next_in != nullptr && _stream.avail_in != 0) {
@@ -282,7 +282,7 @@ inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
       case Z_OK:
         // No output space. Increase the output space by 20%.
         old_sz = output_len;
-        output_len_delta = (int)(output_len * 0.2);
+        output_len_delta = static_cast<size_t>(output_len * 0.2);
         output_len += output_len_delta < 10 ? 10 : output_len_delta;
         tmp = new char[output_len];
         memcpy(tmp, output, old_sz);
@@ -291,7 +291,7 @@ inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
 
         // Set more output.
         _stream.next_out = (Bytef *)(output + old_sz);
-        _stream.avail_out = output_len - old_sz;
+        _stream.avail_out = static_cast<unsigned int>(output_len - old_sz);
         break;
       case Z_BUF_ERROR:
       default:
@@ -301,7 +301,7 @@ inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
     }
   }
 
-  *decompress_size = output_len - _stream.avail_out;
+  *decompress_size = static_cast<int>(output_len - _stream.avail_out);
   inflateEnd(&_stream);
   return output;
 #endif
@@ -329,14 +329,14 @@ inline bool BZip2_Compress(const CompressionOptions& opts, const char* input,
 
   // Compress the input, and put compressed data in output.
   _stream.next_in = (char *)input;
-  _stream.avail_in = length;
+  _stream.avail_in = static_cast<unsigned int>(length);
 
   // Initialize the output size.
   _stream.next_out = (char *)&(*output)[0];
-  _stream.avail_out = length;
+  _stream.avail_out = static_cast<unsigned int>(length);
 
-  int old_sz =0, new_sz =0;
-  while(_stream.next_in != nullptr && _stream.avail_in != 0) {
+  size_t old_sz = 0, new_sz = 0;
+  while (_stream.next_in != nullptr && _stream.avail_in != 0) {
     st = BZ2_bzCompress(&_stream, BZ_FINISH);
     switch (st) {
       case BZ_STREAM_END:
@@ -345,11 +345,11 @@ inline bool BZip2_Compress(const CompressionOptions& opts, const char* input,
         // No output space. Increase the output space by 20%.
         // (Should we fail the compression since it expands the size?)
         old_sz = output->size();
-        new_sz = (int)(output->size() * 1.2);
+        new_sz = static_cast<size_t>(output->size() * 1.2);
         output->resize(new_sz);
         // Set more output.
         _stream.next_out = (char *)&(*output)[old_sz];
-        _stream.avail_out = new_sz - old_sz;
+        _stream.avail_out = static_cast<unsigned int>(new_sz - old_sz);
         break;
       case BZ_SEQUENCE_ERROR:
       default:
@@ -377,15 +377,15 @@ inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
   }
 
   _stream.next_in = (char *)input_data;
-  _stream.avail_in = input_length;
+  _stream.avail_in = static_cast<unsigned int>(input_length);
 
   // Assume the decompressed data size will be 5x of compressed size.
-  int output_len = input_length * 5;
+  size_t output_len = input_length * 5;
   char* output = new char[output_len];
-  int old_sz = output_len;
+  size_t old_sz = output_len;
 
   _stream.next_out = (char *)output;
-  _stream.avail_out = output_len;
+  _stream.avail_out = static_cast<unsigned int>(output_len);
 
   char* tmp = nullptr;
 
@@ -397,7 +397,7 @@ inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
       case BZ_OK:
         // No output space. Increase the output space by 20%.
         old_sz = output_len;
-        output_len = (int)(output_len * 1.2);
+        output_len = static_cast<size_t>(output_len * 1.2);
         tmp = new char[output_len];
         memcpy(tmp, output, old_sz);
         delete[] output;
@@ -405,7 +405,7 @@ inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
 
         // Set more output.
         _stream.next_out = (char *)(output + old_sz);
-        _stream.avail_out = output_len - old_sz;
+        _stream.avail_out = static_cast<unsigned int>(output_len - old_sz);
         break;
       default:
         delete[] output;
@@ -414,7 +414,7 @@ inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
     }
   }
 
-  *decompress_size = output_len - _stream.avail_out;
+  *decompress_size = static_cast<int>(output_len - _stream.avail_out);
   BZ2_bzDecompressEnd(&_stream);
   return output;
 #endif
@@ -424,16 +424,16 @@ inline char* BZip2_Uncompress(const char* input_data, size_t input_length,
 inline bool LZ4_Compress(const CompressionOptions &opts, const char *input,
                          size_t length, ::std::string* output) {
 #ifdef LZ4
-  int compressBound = LZ4_compressBound(length);
-  output->resize(8 + compressBound);
-  char *p = const_cast<char *>(output->c_str());
+  int compressBound = LZ4_compressBound(static_cast<int>(length));
+  output->resize(static_cast<size_t>(8 + compressBound));
+  char* p = const_cast<char*>(output->c_str());
   memcpy(p, &length, sizeof(length));
-  size_t outlen;
-  outlen = LZ4_compress_limitedOutput(input, p + 8, length, compressBound);
+  int outlen = LZ4_compress_limitedOutput(
+      input, p + 8, static_cast<int>(length), compressBound);
   if (outlen == 0) {
     return false;
   }
-  output->resize(8 + outlen);
+  output->resize(static_cast<size_t>(8 + outlen));
   return true;
 #endif
   return false;
@@ -449,7 +449,8 @@ inline char* LZ4_Uncompress(const char* input_data, size_t input_length,
   memcpy(&output_len, input_data, sizeof(output_len));
   char *output = new char[output_len];
   *decompress_size = LZ4_decompress_safe_partial(
-      input_data + 8, output, input_length - 8, output_len, output_len);
+      input_data + 8, output, static_cast<int>(input_length - 8), output_len,
+      output_len);
   if (*decompress_size < 0) {
     delete[] output;
     return nullptr;
@@ -462,21 +463,22 @@ inline char* LZ4_Uncompress(const char* input_data, size_t input_length,
 inline bool LZ4HC_Compress(const CompressionOptions &opts, const char* input,
                            size_t length, ::std::string* output) {
 #ifdef LZ4
-  int compressBound = LZ4_compressBound(length);
-  output->resize(8 + compressBound);
-  char *p = const_cast<char *>(output->c_str());
+  int compressBound = LZ4_compressBound(static_cast<int>(length));
+  output->resize(static_cast<size_t>(8 + compressBound));
+  char* p = const_cast<char*>(output->c_str());
   memcpy(p, &length, sizeof(length));
-  size_t outlen;
+  int outlen;
 #ifdef LZ4_VERSION_MAJOR  // they only started defining this since r113
-  outlen = LZ4_compressHC2_limitedOutput(input, p + 8, length, compressBound,
-                                         opts.level);
+  outlen = LZ4_compressHC2_limitedOutput(input, p + 8, static_cast<int>(length),
+                                         compressBound, opts.level);
 #else
-  outlen = LZ4_compressHC_limitedOutput(input, p + 8, length, compressBound);
+  outlen = LZ4_compressHC_limitedOutput(input, p + 8, static_cast<int>(length),
+                                        compressBound);
 #endif
   if (outlen == 0) {
     return false;
   }
-  output->resize(8 + outlen);
+  output->resize(static_cast<size_t>(8 + outlen));
   return true;
 #endif
   return false;

table/block.cc

@@ -304,7 +304,8 @@ Block::Block(BlockContents&& contents)
   if (size_ < sizeof(uint32_t)) {
     size_ = 0;  // Error marker
   } else {
-    restart_offset_ = size_ - (1 + NumRestarts()) * sizeof(uint32_t);
+    restart_offset_ =
+        static_cast<uint32_t>(size_) - (1 + NumRestarts()) * sizeof(uint32_t);
     if (restart_offset_ > size_ - sizeof(uint32_t)) {
       // The size is too small for NumRestarts() and therefore
       // restart_offset_ wrapped around.

table/block.h

@@ -159,7 +159,8 @@ class BlockIter : public Iterator {
 
   // Return the offset in data_ just past the end of the current entry.
   inline uint32_t NextEntryOffset() const {
-    return (value_.data() + value_.size()) - data_;
+    // NOTE: We don't support files bigger than 2GB
+    return static_cast<uint32_t>((value_.data() + value_.size()) - data_);
   }
 
   uint32_t GetRestartPoint(uint32_t index) {

table/block_based_filter_block.cc

@@ -99,7 +99,7 @@ Slice BlockBasedFilterBlockBuilder::Finish() {
   }
 
   // Append array of per-filter offsets
-  const uint32_t array_offset = result_.size();
+  const uint32_t array_offset = static_cast<uint32_t>(result_.size());
   for (size_t i = 0; i < filter_offsets_.size(); i++) {
     PutFixed32(&result_, filter_offsets_[i]);
   }
@@ -113,7 +113,7 @@ void BlockBasedFilterBlockBuilder::GenerateFilter() {
   const size_t num_entries = start_.size();
   if (num_entries == 0) {
     // Fast path if there are no keys for this filter
-    filter_offsets_.push_back(result_.size());
+    filter_offsets_.push_back(static_cast<uint32_t>(result_.size()));
     return;
   }
 
@@ -127,8 +127,9 @@ void BlockBasedFilterBlockBuilder::GenerateFilter() {
   }
 
   // Generate filter for current set of keys and append to result_.
-  filter_offsets_.push_back(result_.size());
-  policy_->CreateFilter(&tmp_entries_[0], num_entries, &result_);
+  filter_offsets_.push_back(static_cast<uint32_t>(result_.size()));
+  policy_->CreateFilter(&tmp_entries_[0], static_cast<int>(num_entries),
+                        &result_);
 
   tmp_entries_.clear();
   entries_.clear();

table/block_based_table_builder.cc

@@ -203,7 +203,7 @@ class HashIndexBuilder : public IndexBuilder {
       // copy.
       pending_entry_prefix_ = key_prefix.ToString();
       pending_block_num_ = 1;
-      pending_entry_index_ = current_restart_index_;
+      pending_entry_index_ = static_cast<uint32_t>(current_restart_index_);
     } else {
       // entry number increments when keys share the prefix reside in
       // differnt data blocks.
@@ -234,7 +234,8 @@ class HashIndexBuilder : public IndexBuilder {
   void FlushPendingPrefix() {
     prefix_block_.append(pending_entry_prefix_.data(),
                          pending_entry_prefix_.size());
-    PutVarint32(&prefix_meta_block_, pending_entry_prefix_.size());
+    PutVarint32(&prefix_meta_block_,
+                static_cast<uint32_t>(pending_entry_prefix_.size()));
     PutVarint32(&prefix_meta_block_, pending_entry_index_);
     PutVarint32(&prefix_meta_block_, pending_block_num_);
   }
@@ -596,7 +597,8 @@ void BlockBasedTableBuilder::WriteRawBlock(const Slice& block_contents,
       }
       case kxxHash: {
         void* xxh = XXH32_init(0);
-        XXH32_update(xxh, block_contents.data(), block_contents.size());
+        XXH32_update(xxh, block_contents.data(),
+                     static_cast<uint32_t>(block_contents.size()));
         XXH32_update(xxh, trailer, 1);  // Extend  to cover block type
         EncodeFixed32(trailer_without_type, XXH32_digest(xxh));
         break;

table/block_builder.cc

@@ -85,7 +85,7 @@ Slice BlockBuilder::Finish() {
   for (size_t i = 0; i < restarts_.size(); i++) {
     PutFixed32(&buffer_, restarts_[i]);
   }
-  PutFixed32(&buffer_, restarts_.size());
+  PutFixed32(&buffer_, static_cast<uint32_t>(restarts_.size()));
   finished_ = true;
   return Slice(buffer_);
 }
@@ -103,15 +103,15 @@ void BlockBuilder::Add(const Slice& key, const Slice& value) {
     }
   } else {
     // Restart compression
-    restarts_.push_back(buffer_.size());
+    restarts_.push_back(static_cast<uint32_t>(buffer_.size()));
     counter_ = 0;
   }
   const size_t non_shared = key.size() - shared;
 
   // Add "<shared><non_shared><value_size>" to buffer_
-  PutVarint32(&buffer_, shared);
-  PutVarint32(&buffer_, non_shared);
-  PutVarint32(&buffer_, value.size());
+  PutVarint32(&buffer_, static_cast<uint32_t>(shared));
+  PutVarint32(&buffer_, static_cast<uint32_t>(non_shared));
+  PutVarint32(&buffer_, static_cast<uint32_t>(value.size()));
 
   // Add string delta to buffer_ followed by value
   buffer_.append(key.data() + shared, non_shared);

table/block_hash_index.cc

@@ -59,7 +59,7 @@ BlockHashIndex* CreateBlockHashIndexOnTheFly(
   auto hash_index = new BlockHashIndex(
       hash_key_extractor,
       true /* hash_index will copy prefix when Add() is called */);
-  uint64_t current_restart_index = 0;
+  uint32_t current_restart_index = 0;
 
   std::string pending_entry_prefix;
   // pending_block_num == 0 also implies there is no entry inserted at all.

table/block_hash_index_test.cc

@@ -82,8 +82,8 @@ TEST(BlockTest, BasicTest) {
 
   auto prefix_extractor = NewFixedPrefixTransform(prefix_size);
   std::unique_ptr<BlockHashIndex> block_hash_index(CreateBlockHashIndexOnTheFly(
-      &index_iter, &data_iter, index_entries.size(), BytewiseComparator(),
-      prefix_extractor));
+      &index_iter, &data_iter, static_cast<uint32_t>(index_entries.size()),
+      BytewiseComparator(), prefix_extractor));
 
   std::map<std::string, BlockHashIndex::RestartIndex> expected = {
       {"01xx", BlockHashIndex::RestartIndex(0, 1)},

table/block_prefix_index.cc

@@ -87,7 +87,7 @@ class BlockPrefixIndex::Builder {
 
   BlockPrefixIndex* Finish() {
     // For now, use roughly 1:1 prefix to bucket ratio.
-    uint32_t num_buckets = prefixes_.size() + 1;
+    uint32_t num_buckets = static_cast<uint32_t>(prefixes_.size()) + 1;
 
     // Collect prefix records that hash to the same bucket, into a single
     // linklist.

table/block_test.cc

@@ -163,7 +163,7 @@ void CheckBlockContents(BlockContents contents, const int max_key,
     auto iter1 = reader1.NewIterator(nullptr);
     auto iter2 = reader1.NewIterator(nullptr);
     reader1.SetBlockHashIndex(CreateBlockHashIndexOnTheFly(
-        iter1, iter2, keys.size(), BytewiseComparator(),
+        iter1, iter2, static_cast<uint32_t>(keys.size()), BytewiseComparator(),
         prefix_extractor.get()));
 
     delete iter1;

table/cuckoo_table_builder.cc

@@ -182,7 +182,7 @@ Slice CuckooTableBuilder::GetValue(uint64_t idx) const {
 
 Status CuckooTableBuilder::MakeHashTable(std::vector<CuckooBucket>* buckets) {
   buckets->resize(hash_table_size_ + cuckoo_block_size_ - 1);
-  uint64_t make_space_for_key_call_id = 0;
+  uint32_t make_space_for_key_call_id = 0;
   for (uint32_t vector_idx = 0; vector_idx < num_entries_; vector_idx++) {
     uint64_t bucket_id;
     bool bucket_found = false;
@@ -254,7 +254,7 @@ Status CuckooTableBuilder::Finish() {
     }
     // Determine unused_user_key to fill empty buckets.
     std::string unused_user_key = smallest_user_key_;
-    int curr_pos = unused_user_key.size() - 1;
+    int curr_pos = static_cast<int>(unused_user_key.size()) - 1;
     while (curr_pos >= 0) {
       --unused_user_key[curr_pos];
       if (Slice(unused_user_key).compare(smallest_user_key_) < 0) {
@@ -265,7 +265,7 @@ Status CuckooTableBuilder::Finish() {
     if (curr_pos < 0) {
       // Try using the largest key to identify an unused key.
       unused_user_key = largest_user_key_;
-      curr_pos = unused_user_key.size() - 1;
+      curr_pos = static_cast<int>(unused_user_key.size()) - 1;
       while (curr_pos >= 0) {
         ++unused_user_key[curr_pos];
         if (Slice(unused_user_key).compare(largest_user_key_) > 0) {
@@ -429,9 +429,8 @@ uint64_t CuckooTableBuilder::FileSize() const {
 // If tree depth exceedes max depth, we return false indicating failure.
 bool CuckooTableBuilder::MakeSpaceForKey(
     const autovector<uint64_t>& hash_vals,
-    const uint64_t make_space_for_key_call_id,
-    std::vector<CuckooBucket>* buckets,
-    uint64_t* bucket_id) {
+    const uint32_t make_space_for_key_call_id,
+    std::vector<CuckooBucket>* buckets, uint64_t* bucket_id) {
   struct CuckooNode {
     uint64_t bucket_id;
     uint32_t depth;
@@ -495,7 +494,7 @@ bool CuckooTableBuilder::MakeSpaceForKey(
     // child with the parent. Stop when first level is reached in the tree
     // (happens when 0 <= bucket_to_replace_pos < num_hash_func_) and return
     // this location in first level for target key to be inserted.
-    uint32_t bucket_to_replace_pos = tree.size()-1;
+    uint32_t bucket_to_replace_pos = static_cast<uint32_t>(tree.size()) - 1;
     while (bucket_to_replace_pos >= num_hash_func_) {
       CuckooNode& curr_node = tree[bucket_to_replace_pos];
       (*buckets)[curr_node.bucket_id] =

table/cuckoo_table_builder.h

@@ -68,11 +68,9 @@ class CuckooTableBuilder: public TableBuilder {
   };
   static const uint32_t kMaxVectorIdx = std::numeric_limits<int32_t>::max();
 
-  bool MakeSpaceForKey(
-      const autovector<uint64_t>& hash_vals,
-      const uint64_t call_id,
-      std::vector<CuckooBucket>* buckets,
-      uint64_t* bucket_id);
+  bool MakeSpaceForKey(const autovector<uint64_t>& hash_vals,
+                       const uint32_t call_id,
+                       std::vector<CuckooBucket>* buckets, uint64_t* bucket_id);
   Status MakeHashTable(std::vector<CuckooBucket>* buckets);
 
   inline bool IsDeletedKey(uint64_t idx) const;

table/cuckoo_table_builder_test.cc

@@ -87,13 +87,14 @@ class CuckooBuilderTest {
 
     // Check contents of the bucket.
     std::vector<bool> keys_found(keys.size(), false);
-    uint32_t bucket_size = expected_unused_bucket.size();
+    size_t bucket_size = expected_unused_bucket.size();
     for (uint32_t i = 0; i < table_size + cuckoo_block_size - 1; ++i) {
       Slice read_slice;
       ASSERT_OK(read_file->Read(i*bucket_size, bucket_size,
             &read_slice, nullptr));
-      uint32_t key_idx = std::find(expected_locations.begin(),
-          expected_locations.end(), i) - expected_locations.begin();
+      size_t key_idx =
+          std::find(expected_locations.begin(), expected_locations.end(), i) -
+          expected_locations.begin();
       if (key_idx == keys.size()) {
         // i is not one of the expected locaitons. Empty bucket.
         ASSERT_EQ(read_slice.compare(expected_unused_bucket), 0);
@@ -156,7 +157,7 @@ TEST(CuckooBuilderTest, WriteSuccessNoCollisionFullKey) {
   for (auto& user_key : user_keys) {
     keys.push_back(GetInternalKey(user_key, false));
   }
-  uint32_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/NoCollisionFullKey";
@@ -169,7 +170,7 @@ TEST(CuckooBuilderTest, WriteSuccessNoCollisionFullKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = keys[0].size() + values[0].size();
+  size_t bucket_size = keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -196,7 +197,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionFullKey) {
   for (auto& user_key : user_keys) {
     keys.push_back(GetInternalKey(user_key, false));
   }
-  uint32_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/WithCollisionFullKey";
@@ -209,7 +210,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionFullKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = keys[0].size() + values[0].size();
+  size_t bucket_size = keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -236,7 +237,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionAndCuckooBlock) {
   for (auto& user_key : user_keys) {
     keys.push_back(GetInternalKey(user_key, false));
   }
-  uint32_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   uint32_t cuckoo_block_size = 2;
@@ -251,7 +252,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionAndCuckooBlock) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = keys[0].size() + values[0].size();
+  size_t bucket_size = keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -283,7 +284,7 @@ TEST(CuckooBuilderTest, WithCollisionPathFullKey) {
   for (auto& user_key : user_keys) {
     keys.push_back(GetInternalKey(user_key, false));
   }
-  uint32_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/WithCollisionPathFullKey";
@@ -296,7 +297,7 @@ TEST(CuckooBuilderTest, WithCollisionPathFullKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = keys[0].size() + values[0].size();
+  size_t bucket_size = keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -325,7 +326,7 @@ TEST(CuckooBuilderTest, WithCollisionPathFullKeyAndCuckooBlock) {
   for (auto& user_key : user_keys) {
     keys.push_back(GetInternalKey(user_key, false));
   }
-  uint32_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/WithCollisionPathFullKeyAndCuckooBlock";
@@ -338,7 +339,7 @@ TEST(CuckooBuilderTest, WithCollisionPathFullKeyAndCuckooBlock) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = keys[0].size() + values[0].size();
+  size_t bucket_size = keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -361,7 +362,7 @@ TEST(CuckooBuilderTest, WriteSuccessNoCollisionUserKey) {
     {user_keys[3], {3, 4, 5, 6}}
   };
   std::vector<uint64_t> expected_locations = {0, 1, 2, 3};
-  uint32_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/NoCollisionUserKey";
@@ -374,7 +375,7 @@ TEST(CuckooBuilderTest, WriteSuccessNoCollisionUserKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = user_keys[0].size() + values[0].size();
+  size_t bucket_size = user_keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -397,7 +398,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionUserKey) {
     {user_keys[3], {0, 1, 2, 3}},
   };
   std::vector<uint64_t> expected_locations = {0, 1, 2, 3};
-  uint32_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/WithCollisionUserKey";
@@ -410,7 +411,7 @@ TEST(CuckooBuilderTest, WriteSuccessWithCollisionUserKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = user_keys[0].size() + values[0].size();
+  size_t bucket_size = user_keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());
@@ -435,7 +436,7 @@ TEST(CuckooBuilderTest, WithCollisionPathUserKey) {
     {user_keys[4], {0, 2}},
   };
   std::vector<uint64_t> expected_locations = {0, 1, 3, 4, 2};
-  uint32_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
+  uint64_t expected_table_size = NextPowOf2(user_keys.size() / kHashTableRatio);
 
   unique_ptr<WritableFile> writable_file;
   fname = test::TmpDir() + "/WithCollisionPathUserKey";
@@ -448,7 +449,7 @@ TEST(CuckooBuilderTest, WithCollisionPathUserKey) {
     ASSERT_EQ(builder.NumEntries(), i + 1);
     ASSERT_OK(builder.status());
   }
-  uint32_t bucket_size = user_keys[0].size() + values[0].size();
+  size_t bucket_size = user_keys[0].size() + values[0].size();
   ASSERT_EQ(expected_table_size * bucket_size - 1, builder.FileSize());
   ASSERT_OK(builder.Finish());
   ASSERT_OK(writable_file->Close());

table/cuckoo_table_factory.h

@@ -28,7 +28,7 @@ static inline uint64_t CuckooHash(
   if (hash_cnt == 0 && identity_as_first_hash) {
     value = (*reinterpret_cast<const int64_t*>(user_key.data()));
   } else {
-    value = MurmurHash(user_key.data(), user_key.size(),
+    value = MurmurHash(user_key.data(), static_cast<int>(user_key.size()),
                        kCuckooMurmurSeedMultiplier * hash_cnt);
   }
   if (use_module_hash) {

table/cuckoo_table_reader.cc

@@ -64,7 +64,7 @@ CuckooTableReader::CuckooTableReader(
   }
   unused_key_ = unused_key->second;
 
-  key_length_ = props->fixed_key_len;
+  key_length_ = static_cast<uint32_t>(props->fixed_key_len);
   auto user_key_len = user_props.find(CuckooTablePropertyNames::kUserKeyLength);
   if (user_key_len == user_props.end()) {
     status_ = Status::Corruption("User key length not found");
@@ -274,7 +274,7 @@ void CuckooTableIterator::SeekToFirst() {
 
 void CuckooTableIterator::SeekToLast() {
   InitIfNeeded();
-  curr_key_idx_ = sorted_bucket_ids_.size() - 1;
+  curr_key_idx_ = static_cast<uint32_t>(sorted_bucket_ids_.size()) - 1;
   PrepareKVAtCurrIdx();
 }
 
@@ -288,7 +288,8 @@ void CuckooTableIterator::Seek(const Slice& target) {
       sorted_bucket_ids_.end(),
       kInvalidIndex,
       seek_comparator);
-  curr_key_idx_ = std::distance(sorted_bucket_ids_.begin(), seek_it);
+  curr_key_idx_ =
+      static_cast<uint32_t>(std::distance(sorted_bucket_ids_.begin(), seek_it));
   PrepareKVAtCurrIdx();
 }
 
@@ -327,7 +328,7 @@ void CuckooTableIterator::Next() {
 
 void CuckooTableIterator::Prev() {
   if (curr_key_idx_ == 0) {
-    curr_key_idx_ = sorted_bucket_ids_.size();
+    curr_key_idx_ = static_cast<uint32_t>(sorted_bucket_ids_.size());
   }
   if (!Valid()) {
     curr_value_.clear();

table/cuckoo_table_reader_test.cc

@@ -161,7 +161,7 @@ class CuckooReaderTest {
     ASSERT_EQ(static_cast<uint32_t>(cnt), num_items);
 
     it->SeekToLast();
-    cnt = num_items - 1;
+    cnt = static_cast<int>(num_items) - 1;
     ASSERT_TRUE(it->Valid());
     while (it->Valid()) {
       ASSERT_OK(it->status());
@@ -172,7 +172,7 @@ class CuckooReaderTest {
     }
     ASSERT_EQ(cnt, -1);
 
-    cnt = num_items / 2;
+    cnt = static_cast<int>(num_items) / 2;
     it->Seek(keys[cnt]);
     while (it->Valid()) {
       ASSERT_OK(it->status());

table/format.cc

@@ -240,7 +240,7 @@ Status ReadBlock(RandomAccessFile* file, const Footer& footer,
         actual = crc32c::Value(data, n + 1);
         break;
       case kxxHash:
-        actual = XXH32(data, n + 1, 0);
+        actual = XXH32(data, static_cast<int>(n) + 1, 0);
         break;
       default:
         s = Status::Corruption("unknown checksum type");

table/full_filter_block_test.cc

@@ -25,7 +25,7 @@ class TestFilterBitsBuilder : public FilterBitsBuilder {
 
   // Generate the filter using the keys that are added
   virtual Slice Finish(std::unique_ptr<const char[]>* buf) override {
-    uint32_t len = hash_entries_.size() * 4;
+    uint32_t len = static_cast<uint32_t>(hash_entries_.size()) * 4;
     char* data = new char[len];
     for (size_t i = 0; i < hash_entries_.size(); i++) {
       EncodeFixed32(data + i * 4, hash_entries_[i]);
@@ -42,7 +42,7 @@ class TestFilterBitsBuilder : public FilterBitsBuilder {
 class TestFilterBitsReader : public FilterBitsReader {
  public:
   explicit TestFilterBitsReader(const Slice& contents)
-    : data_(contents.data()), len_(contents.size()) {}
+      : data_(contents.data()), len_(static_cast<uint32_t>(contents.size())) {}
 
   virtual bool MayMatch(const Slice& entry) override {
     uint32_t h = Hash(entry.data(), entry.size(), 1);

table/merger_test.cc

@@ -49,9 +49,9 @@ class MergerTest {
   MergerTest()
       : rnd_(3), merging_iterator_(nullptr), single_iterator_(nullptr) {}
   ~MergerTest() = default;
-  std::vector<std::string> GenerateStrings(int len, int string_len) {
+  std::vector<std::string> GenerateStrings(size_t len, int string_len) {
     std::vector<std::string> ret;
-    for (int i = 0; i < len; ++i) {
+    for (size_t i = 0; i < len; ++i) {
       ret.push_back(test::RandomHumanReadableString(&rnd_, string_len));
     }
     return ret;
@@ -119,7 +119,7 @@ class MergerTest {
   }
 
   void Generate(size_t num_iterators, size_t strings_per_iterator,
-                size_t letters_per_string) {
+                int letters_per_string) {
     std::vector<Iterator*> small_iterators;
     for (size_t i = 0; i < num_iterators; ++i) {
       auto strings = GenerateStrings(strings_per_iterator, letters_per_string);
@@ -127,8 +127,9 @@ class MergerTest {
       all_keys_.insert(all_keys_.end(), strings.begin(), strings.end());
     }
 
-    merging_iterator_.reset(NewMergingIterator(
-        BytewiseComparator(), &small_iterators[0], small_iterators.size()));
+    merging_iterator_.reset(
+        NewMergingIterator(BytewiseComparator(), &small_iterators[0],
+                           static_cast<int>(small_iterators.size())));
     single_iterator_.reset(new VectorIterator(all_keys_));
   }
 

table/plain_table_builder.cc

@@ -6,8 +6,10 @@
 #ifndef ROCKSDB_LITE
 #include "table/plain_table_builder.h"
 
-#include <string>
 #include <assert.h>
+
+#include <string>
+#include <limits>
 #include <map>
 
 #include "rocksdb/comparator.h"
@@ -133,7 +135,8 @@ void PlainTableBuilder::Add(const Slice& key, const Slice& value) {
   }
 
   // Write value
-  auto prev_offset = offset_;
+  assert(offset_ <= std::numeric_limits<uint32_t>::max());
+  auto prev_offset = static_cast<uint32_t>(offset_);
   // Write out the key
   encoder_.AppendKey(key, file_, &offset_, meta_bytes_buf,
                      &meta_bytes_buf_size);
@@ -142,7 +145,7 @@ void PlainTableBuilder::Add(const Slice& key, const Slice& value) {
   }
 
   // Write value length
-  int value_size = value.size();
+  uint32_t value_size = static_cast<uint32_t>(value.size());
   char* end_ptr =
       EncodeVarint32(meta_bytes_buf + meta_bytes_buf_size, value_size);
   assert(end_ptr <= meta_bytes_buf + sizeof(meta_bytes_buf));
@@ -180,10 +183,11 @@ Status PlainTableBuilder::Finish() {
   MetaIndexBuilder meta_index_builer;
 
   if (store_index_in_file_ && (properties_.num_entries > 0)) {
+    assert(properties_.num_entries <= std::numeric_limits<uint32_t>::max());
     bloom_block_.SetTotalBits(
-        &arena_, properties_.num_entries * bloom_bits_per_key_,
-        ioptions_.bloom_locality, huge_page_tlb_size_,
-        ioptions_.info_log);
+        &arena_,
+        static_cast<uint32_t>(properties_.num_entries) * bloom_bits_per_key_,
+        ioptions_.bloom_locality, huge_page_tlb_size_, ioptions_.info_log);
 
     PutVarint32(&properties_.user_collected_properties
                      [PlainTablePropertyNames::kNumBloomBlocks],

table/plain_table_builder.h

@@ -81,7 +81,7 @@ class PlainTableBuilder: public TableBuilder {
   WritableFile* file_;
   uint64_t offset_ = 0;
   uint32_t bloom_bits_per_key_;
-  uint32_t huge_page_tlb_size_;
+  size_t huge_page_tlb_size_;
   Status status_;
   TableProperties properties_;
   PlainTableKeyEncoder encoder_;

table/plain_table_index.cc

@@ -3,6 +3,12 @@
 //  LICENSE file in the root directory of this source tree. An additional grant
 //  of patent rights can be found in the PATENTS file in the same directory.
 
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
+#include <inttypes.h>
+
 #include "table/plain_table_index.h"
 #include "util/coding.h"
 #include "util/hash.h"
@@ -24,7 +30,8 @@ Status PlainTableIndex::InitFromRawData(Slice data) {
   if (!GetVarint32(&data, &num_prefixes_)) {
     return Status::Corruption("Couldn't read the index size!");
   }
-  sub_index_size_ = data.size() - index_size_ * kOffsetLen;
+  sub_index_size_ =
+      static_cast<uint32_t>(data.size()) - index_size_ * kOffsetLen;
 
   char* index_data_begin = const_cast<char*>(data.data());
   index_ = reinterpret_cast<uint32_t*>(index_data_begin);
@@ -55,13 +62,15 @@ void PlainTableIndexBuilder::IndexRecordList::AddRecord(murmur_t hash,
     num_records_in_current_group_ = 0;
   }
   auto& new_record = current_group_[num_records_in_current_group_++];
-  new_record.hash = hash;
+  // TODO(sdong) -- check if this is OK -- murmur_t is uint64_t, while we only
+  // use 32 bits here
+  new_record.hash = static_cast<uint32_t>(hash);
   new_record.offset = offset;
   new_record.next = nullptr;
 }
 
 void PlainTableIndexBuilder::AddKeyPrefix(Slice key_prefix_slice,
-                                          uint64_t key_offset) {
+                                          uint32_t key_offset) {
   if (is_first_record_ || prev_key_prefix_ != key_prefix_slice.ToString()) {
     ++num_prefixes_;
     if (!is_first_record_) {
@@ -149,7 +158,7 @@ Slice PlainTableIndexBuilder::FillIndexes(
     const std::vector<IndexRecord*>& hash_to_offsets,
     const std::vector<uint32_t>& entries_per_bucket) {
   Log(InfoLogLevel::DEBUG_LEVEL, ioptions_.info_log,
-      "Reserving %zu bytes for plain table's sub_index",
+      "Reserving %" PRIu32 " bytes for plain table's sub_index",
       sub_index_size_);
   auto total_allocate_size = GetTotalSize();
   char* allocated = arena_->AllocateAligned(
@@ -160,7 +169,7 @@ Slice PlainTableIndexBuilder::FillIndexes(
       reinterpret_cast<uint32_t*>(EncodeVarint32(temp_ptr, num_prefixes_));
   char* sub_index = reinterpret_cast<char*>(index + index_size_);
 
-  size_t sub_index_offset = 0;
+  uint32_t sub_index_offset = 0;
   for (uint32_t i = 0; i < index_size_; i++) {
     uint32_t num_keys_for_bucket = entries_per_bucket[i];
     switch (num_keys_for_bucket) {

table/plain_table_index.h

@@ -92,7 +92,7 @@ class PlainTableIndex {
 
  private:
   uint32_t index_size_;
-  size_t sub_index_size_;
+  uint32_t sub_index_size_;
   uint32_t num_prefixes_;
 
   uint32_t* index_;
@@ -109,8 +109,8 @@ class PlainTableIndex {
 class PlainTableIndexBuilder {
  public:
   PlainTableIndexBuilder(Arena* arena, const ImmutableCFOptions& ioptions,
-                         uint32_t index_sparseness, double hash_table_ratio,
-                         double huge_page_tlb_size)
+                         size_t index_sparseness, double hash_table_ratio,
+                         size_t huge_page_tlb_size)
       : arena_(arena),
         ioptions_(ioptions),
         record_list_(kRecordsPerGroup),
@@ -124,7 +124,7 @@ class PlainTableIndexBuilder {
         hash_table_ratio_(hash_table_ratio),
         huge_page_tlb_size_(huge_page_tlb_size) {}
 
-  void AddKeyPrefix(Slice key_prefix_slice, uint64_t key_offset);
+  void AddKeyPrefix(Slice key_prefix_slice, uint32_t key_offset);
 
   Slice Finish();
 
@@ -205,13 +205,13 @@ class PlainTableIndexBuilder {
   uint32_t num_keys_per_prefix_;
 
   uint32_t prev_key_prefix_hash_;
-  uint32_t index_sparseness_;
+  size_t index_sparseness_;
   uint32_t index_size_;
-  size_t sub_index_size_;
+  uint32_t sub_index_size_;
 
   const SliceTransform* prefix_extractor_;
   double hash_table_ratio_;
-  double huge_page_tlb_size_;
+  size_t huge_page_tlb_size_;
 
   std::string prev_key_prefix_;
 

table/plain_table_key_coding.cc

@@ -43,7 +43,7 @@ size_t EncodeSize(EntryType type, uint32_t key_size, char* out_buffer) {
 
 // Return position after the size byte(s). nullptr means error
 const char* DecodeSize(const char* offset, const char* limit,
-                       EntryType* entry_type, size_t* key_size) {
+                       EntryType* entry_type, uint32_t* key_size) {
   assert(offset < limit);
   *entry_type = static_cast<EntryType>(
       (static_cast<unsigned char>(offset[0]) & ~kSizeInlineLimit) >> 6);
@@ -73,10 +73,10 @@ Status PlainTableKeyEncoder::AppendKey(const Slice& key, WritableFile* file,
 
   Slice key_to_write = key;  // Portion of internal key to write out.
 
-  size_t user_key_size = fixed_user_key_len_;
+  uint32_t user_key_size = fixed_user_key_len_;
   if (encoding_type_ == kPlain) {
     if (fixed_user_key_len_ == kPlainTableVariableLength) {
-      user_key_size = key.size() - 8;
+      user_key_size = static_cast<uint32_t>(key.size() - 8);
       // Write key length
       char key_size_buf[5];  // tmp buffer for key size as varint32
       char* ptr = EncodeVarint32(key_size_buf, user_key_size);
@@ -93,7 +93,7 @@ Status PlainTableKeyEncoder::AppendKey(const Slice& key, WritableFile* file,
     char size_bytes[12];
     size_t size_bytes_pos = 0;
 
-    user_key_size = key.size() - 8;
+    user_key_size = static_cast<uint32_t>(key.size() - 8);
 
     Slice prefix =
         prefix_extractor_->Transform(Slice(key.data(), user_key_size));
@@ -112,10 +112,11 @@ Status PlainTableKeyEncoder::AppendKey(const Slice& key, WritableFile* file,
       if (key_count_for_prefix_ == 2) {
         // For second key within a prefix, need to encode prefix length
         size_bytes_pos +=
-            EncodeSize(kPrefixFromPreviousKey, pre_prefix_.GetKey().size(),
+            EncodeSize(kPrefixFromPreviousKey,
+                       static_cast<uint32_t>(pre_prefix_.GetKey().size()),
                        size_bytes + size_bytes_pos);
       }
-      size_t prefix_len = pre_prefix_.GetKey().size();
+      uint32_t prefix_len = static_cast<uint32_t>(pre_prefix_.GetKey().size());
       size_bytes_pos += EncodeSize(kKeySuffix, user_key_size - prefix_len,
                                    size_bytes + size_bytes_pos);
       Status s = file->Append(Slice(size_bytes, size_bytes_pos));
@@ -184,7 +185,7 @@ Status PlainTableKeyDecoder::NextPlainEncodingKey(
     const char* start, const char* limit, ParsedInternalKey* parsed_key,
     Slice* internal_key, size_t* bytes_read, bool* seekable) {
   const char* key_ptr = start;
-  size_t user_key_size = 0;
+  uint32_t user_key_size = 0;
   if (fixed_user_key_len_ != kPlainTableVariableLength) {
     user_key_size = fixed_user_key_len_;
     key_ptr = start;
@@ -195,7 +196,7 @@ Status PlainTableKeyDecoder::NextPlainEncodingKey(
       return Status::Corruption(
           "Unexpected EOF when reading the next key's size");
     }
-    user_key_size = static_cast<size_t>(tmp_size);
+    user_key_size = tmp_size;
     *bytes_read = key_ptr - start;
   }
   // dummy initial value to avoid compiler complain
@@ -227,7 +228,7 @@ Status PlainTableKeyDecoder::NextPrefixEncodingKey(
 
   bool expect_suffix = false;
   do {
-    size_t size = 0;
+    uint32_t size = 0;
     // dummy initial value to avoid compiler complain
     bool decoded_internal_key_valid = true;
     const char* pos = DecodeSize(key_ptr, limit, &entry_type, &size);

table/plain_table_reader.cc

@@ -98,8 +98,8 @@ PlainTableReader::PlainTableReader(const ImmutableCFOptions& ioptions,
     : internal_comparator_(icomparator),
       encoding_type_(encoding_type),
       full_scan_mode_(false),
-      data_end_offset_(table_properties->data_size),
-      user_key_len_(table_properties->fixed_key_len),
+      data_end_offset_(static_cast<uint32_t>(table_properties->data_size)),
+      user_key_len_(static_cast<uint32_t>(table_properties->fixed_key_len)),
       prefix_extractor_(ioptions.prefix_extractor),
       enable_bloom_(false),
       bloom_(6, nullptr),
@@ -327,7 +327,8 @@ Status PlainTableReader::PopulateIndex(TableProperties* props,
     // Allocate bloom filter here for total order mode.
     if (IsTotalOrderMode()) {
       uint32_t num_bloom_bits =
-          table_properties_->num_entries * bloom_bits_per_key;
+          static_cast<uint32_t>(table_properties_->num_entries) *
+          bloom_bits_per_key;
       if (num_bloom_bits > 0) {
         enable_bloom_ = true;
         bloom_.SetTotalBits(&arena_, num_bloom_bits, ioptions_.bloom_locality,
@@ -350,7 +351,7 @@ Status PlainTableReader::PopulateIndex(TableProperties* props,
     bloom_.SetRawData(
         const_cast<unsigned char*>(
             reinterpret_cast<const unsigned char*>(bloom_block->data())),
-        bloom_block->size() * 8, num_blocks);
+        static_cast<uint32_t>(bloom_block->size()) * 8, num_blocks);
   }
 
   PlainTableIndexBuilder index_builder(&arena_, ioptions_, index_sparseness,
@@ -509,7 +510,7 @@ Status PlainTableReader::Next(PlainTableKeyDecoder* decoder, uint32_t* offset,
     return Status::Corruption(
         "Unexpected EOF when reading the next value's size.");
   }
-  *offset = *offset + (value_ptr - start) + value_size;
+  *offset = *offset + static_cast<uint32_t>(value_ptr - start) + value_size;
   if (*offset > data_end_offset_) {
     return Status::Corruption("Unexpected EOF when reading the next value. ");
   }

table/plain_table_reader.h

@@ -123,7 +123,7 @@ class PlainTableReader: public TableReader {
   // sst file that stores data.
   const uint32_t data_start_offset_ = 0;
   const uint32_t data_end_offset_;
-  const size_t user_key_len_;
+  const uint32_t user_key_len_;
   const SliceTransform* prefix_extractor_;
 
   static const size_t kNumInternalBytes = 8;
@@ -135,7 +135,7 @@ class PlainTableReader: public TableReader {
 
   const ImmutableCFOptions& ioptions_;
   unique_ptr<RandomAccessFile> file_;
-  uint32_t file_size_;
+  uint64_t file_size_;
   std::shared_ptr<const TableProperties> table_properties_;
 
   bool IsFixedLength() const {

table/table_test.cc

@@ -947,7 +947,7 @@ class Harness {
     if (keys.empty()) {
       return "foo";
     } else {
-      const int index = rnd->Uniform(keys.size());
+      const int index = rnd->Uniform(static_cast<int>(keys.size()));
       std::string result = keys[index];
       switch (rnd->Uniform(support_prev_ ? 3 : 1)) {
         case 0:

tools/blob_store_bench.cc

@@ -31,7 +31,7 @@ BlobStore* bs;
 namespace {
 std::string RandomString(Random* rnd, uint64_t len) {
   std::string r;
-  test::RandomString(rnd, len, &r);
+  test::RandomString(rnd, static_cast<int>(len), &r);
   return r;
 }
 }  // namespace

tools/db_stress.cc

@@ -113,7 +113,8 @@ DEFINE_bool(verbose, false, "Verbose");
 DEFINE_bool(progress_reports, true,
             "If true, db_stress will report number of finished operations");
 
-DEFINE_int32(write_buffer_size, rocksdb::Options().write_buffer_size,
+DEFINE_int32(write_buffer_size,
+             static_cast<int32_t>(rocksdb::Options().write_buffer_size),
              "Number of bytes to buffer in memtable before compacting");
 
 DEFINE_int32(max_write_buffer_number,
@@ -154,7 +155,8 @@ DEFINE_int32(level0_stop_writes_trigger,
              rocksdb::Options().level0_stop_writes_trigger,
              "Number of files in level-0 that will trigger put stop.");
 
-DEFINE_int32(block_size, rocksdb::BlockBasedTableOptions().block_size,
+DEFINE_int32(block_size,
+             static_cast<int32_t>(rocksdb::BlockBasedTableOptions().block_size),
              "Number of bytes in a block.");
 
 DEFINE_int32(max_background_compactions,
@@ -573,9 +575,9 @@ class SharedState {
 
   explicit SharedState(StressTest* stress_test)
       : cv_(&mu_),
-        seed_(FLAGS_seed),
+        seed_(static_cast<uint32_t>(FLAGS_seed)),
         max_key_(FLAGS_max_key),
-        log2_keys_per_lock_(FLAGS_log2_keys_per_lock),
+        log2_keys_per_lock_(static_cast<uint32_t>(FLAGS_log2_keys_per_lock)),
         num_threads_(FLAGS_threads),
         num_initialized_(0),
         num_populated_(0),
@@ -1451,7 +1453,7 @@ class StressTest {
           assert(count <=
                  (static_cast<int64_t>(1) << ((8 - FLAGS_prefix_size) * 8)));
           if (iter->status().ok()) {
-            thread->stats.AddPrefixes(1, count);
+            thread->stats.AddPrefixes(1, static_cast<int>(count));
           } else {
             thread->stats.AddErrors(1);
           }
@@ -1489,7 +1491,8 @@ class StressTest {
         } else {
           MultiPut(thread, write_opts, column_family, key, v, sz);
         }
-        PrintKeyValue(rand_column_family, rand_key, value, sz);
+        PrintKeyValue(rand_column_family, static_cast<uint32_t>(rand_key),
+                      value, sz);
       } else if (writeBound <= prob_op && prob_op < delBound) {
         // OPERATION delete
         if (!FLAGS_test_batches_snapshots) {
@@ -1553,16 +1556,19 @@ class StressTest {
               from_db = iter->value().ToString();
               iter->Next();
             } else if (iter->key().compare(k) < 0) {
-              VerificationAbort(shared, "An out of range key was found", cf, i);
+              VerificationAbort(shared, "An out of range key was found",
+                                static_cast<int>(cf), i);
             }
           } else {
             // The iterator found no value for the key in question, so do not
             // move to the next item in the iterator
             s = Status::NotFound(Slice());
           }
-          VerifyValue(cf, i, options, shared, from_db, s, true);
+          VerifyValue(static_cast<int>(cf), i, options, shared, from_db, s,
+                      true);
           if (from_db.length()) {
-            PrintKeyValue(cf, i, from_db.data(), from_db.length());
+            PrintKeyValue(static_cast<int>(cf), static_cast<uint32_t>(i),
+                          from_db.data(), from_db.length());
           }
         }
       } else {
@@ -1575,9 +1581,11 @@ class StressTest {
           std::string keystr = Key(i);
           Slice k = keystr;
           Status s = db_->Get(options, column_families_[cf], k, &from_db);
-          VerifyValue(cf, i, options, shared, from_db, s, true);
+          VerifyValue(static_cast<int>(cf), i, options, shared, from_db, s,
+                      true);
           if (from_db.length()) {
-            PrintKeyValue(cf, i, from_db.data(), from_db.length());
+            PrintKeyValue(static_cast<int>(cf), static_cast<uint32_t>(i),
+                          from_db.data(), from_db.length());
           }
         }
       }

util/auto_roll_logger.cc

@@ -18,8 +18,7 @@ Status AutoRollLogger::ResetLogger() {
     return status_;
   }
 
-  if (logger_->GetLogFileSize() ==
-      (size_t)Logger::DO_NOT_SUPPORT_GET_LOG_FILE_SIZE) {
+  if (logger_->GetLogFileSize() == Logger::kDoNotSupportGetLogFileSize) {
     status_ = Status::NotSupported(
         "The underlying logger doesn't support GetLogFileSize()");
   }

util/auto_roll_logger_test.cc

@@ -122,7 +122,7 @@ uint64_t AutoRollLoggerTest::RollLogFileByTimeTest(
   }
 
   // -- Make the log file expire
-  sleep(time);
+  sleep(static_cast<unsigned int>(time));
   LogMessage(logger, log_message.c_str());
 
   // At this time, the new log file should be created.

util/benchharness.cc

@@ -206,7 +206,8 @@ static double RunBenchmarkGetNSPerIteration(const BenchmarkFun& fun,
   size_t actualEpochs = 0;
 
   for (; actualEpochs < epochs; ++actualEpochs) {
-    for (unsigned int n = FLAGS_bm_min_iters; n < (1UL << 30); n *= 2) {
+    for (unsigned int n = static_cast<unsigned int>(FLAGS_bm_min_iters);
+         n < (1UL << 30); n *= 2) {
       auto const nsecs = fun(n);
       if (nsecs < minNanoseconds) {
         continue;

util/benchharness_test.cc

@@ -10,35 +10,35 @@
 namespace rocksdb {
 
 BENCHMARK(insertFrontVector) {
-  std::vector<int> v;
-  for (int i = 0; i < 100; i++) {
+  std::vector<size_t> v;
+  for (size_t i = 0; i < 100; i++) {
     v.insert(v.begin(), i);
   }
 }
 
 BENCHMARK_RELATIVE(insertBackVector) {
-  std::vector<int> v;
+  std::vector<size_t> v;
   for (size_t i = 0; i < 100; i++) {
     v.insert(v.end(), i);
   }
 }
 
 BENCHMARK_N(insertFrontVector_n, n) {
-  std::vector<int> v;
+  std::vector<size_t> v;
   for (size_t i = 0; i < n; i++) {
     v.insert(v.begin(), i);
   }
 }
 
 BENCHMARK_RELATIVE_N(insertBackVector_n, n) {
-  std::vector<int> v;
+  std::vector<size_t> v;
   for (size_t i = 0; i < n; i++) {
     v.insert(v.end(), i);
   }
 }
 
 BENCHMARK_N(insertFrontEnd_n, n) {
-  std::vector<int> v;
+  std::vector<size_t> v;
   for (size_t i = 0; i < n; i++) {
     v.insert(v.begin(), i);
   }
@@ -48,7 +48,7 @@ BENCHMARK_N(insertFrontEnd_n, n) {
 }
 
 BENCHMARK_RELATIVE_N(insertFrontEndSuspend_n, n) {
-  std::vector<int> v;
+  std::vector<size_t> v;
   for (size_t i = 0; i < n; i++) {
     v.insert(v.begin(), i);
   }

util/blob_store.cc

@@ -132,7 +132,9 @@ BlobStore::~BlobStore() {
 
 Status BlobStore::Put(const Slice& value, Blob* blob) {
   // convert size to number of blocks
-  Status s = Allocate((value.size() + block_size_ - 1) / block_size_, blob);
+  Status s = Allocate(
+      static_cast<uint32_t>((value.size() + block_size_ - 1) / block_size_),
+      blob);
   if (!s.ok()) {
     return s;
   }

util/bloom.cc

@@ -55,7 +55,8 @@ class FullFilterBitsBuilder : public FilterBitsBuilder {
   // +----------------------------------------------------------------+
   virtual Slice Finish(std::unique_ptr<const char[]>* buf) override {
     uint32_t total_bits, num_lines;
-    char* data = ReserveSpace(hash_entries_.size(), &total_bits, &num_lines);
+    char* data = ReserveSpace(static_cast<int>(hash_entries_.size()),
+                              &total_bits, &num_lines);
     assert(data);
 
     if (total_bits != 0 && num_lines != 0) {
@@ -111,7 +112,7 @@ char* FullFilterBitsBuilder::ReserveSpace(const int num_entry,
   assert(bits_per_key_);
   char* data = nullptr;
   if (num_entry != 0) {
-    uint32_t total_bits_tmp = num_entry * bits_per_key_;
+    uint32_t total_bits_tmp = num_entry * static_cast<uint32_t>(bits_per_key_);
 
     *total_bits = GetTotalBitsForLocality(total_bits_tmp);
     *num_lines = *total_bits / (CACHE_LINE_SIZE * 8);
@@ -152,8 +153,9 @@ class FullFilterBitsReader : public FilterBitsReader {
  public:
   explicit FullFilterBitsReader(const Slice& contents)
       : data_(const_cast<char*>(contents.data())),
-        data_len_(contents.size()),
-        num_probes_(0), num_lines_(0) {
+        data_len_(static_cast<uint32_t>(contents.size())),
+        num_probes_(0),
+        num_lines_(0) {
     assert(data_);
     GetFilterMeta(contents, &num_probes_, &num_lines_);
     // Sanitize broken parameter
@@ -210,7 +212,7 @@ class FullFilterBitsReader : public FilterBitsReader {
 
 void FullFilterBitsReader::GetFilterMeta(const Slice& filter,
     size_t* num_probes, uint32_t* num_lines) {
-  uint32_t len = filter.size();
+  uint32_t len = static_cast<uint32_t>(filter.size());
   if (len <= 5) {
     // filter is empty or broken
     *num_probes = 0;
@@ -225,7 +227,7 @@ void FullFilterBitsReader::GetFilterMeta(const Slice& filter,
 bool FullFilterBitsReader::HashMayMatch(const uint32_t& hash,
     const Slice& filter, const size_t& num_probes,
     const uint32_t& num_lines) {
-  uint32_t len = filter.size();
+  uint32_t len = static_cast<uint32_t>(filter.size());
   if (len <= 5) return false;  // remain the same with original filter
 
   // It is ensured the params are valid before calling it

util/bloom_test.cc

@@ -79,7 +79,8 @@ class BloomTest {
       key_slices.push_back(Slice(keys_[i]));
     }
     filter_.clear();
-    policy_->CreateFilter(&key_slices[0], key_slices.size(), &filter_);
+    policy_->CreateFilter(&key_slices[0], static_cast<int>(key_slices.size()),
+                          &filter_);
     keys_.clear();
     if (kVerbose >= 2) DumpFilter();
   }

util/cache.cc

@@ -145,7 +145,7 @@ class LRUCache {
 
   // Separate from constructor so caller can easily make an array of LRUCache
   void SetCapacity(size_t capacity) { capacity_ = capacity; }
-  void SetRemoveScanCountLimit(size_t remove_scan_count_limit) {
+  void SetRemoveScanCountLimit(uint32_t remove_scan_count_limit) {
     remove_scan_count_limit_ = remove_scan_count_limit;
   }
 

util/cache_test.cc

@@ -28,7 +28,9 @@ static int DecodeKey(const Slice& k) {
   return DecodeFixed32(k.data());
 }
 static void* EncodeValue(uintptr_t v) { return reinterpret_cast<void*>(v); }
-static int DecodeValue(void* v) { return reinterpret_cast<uintptr_t>(v); }
+static int DecodeValue(void* v) {
+  return static_cast<int>(reinterpret_cast<uintptr_t>(v));
+}
 
 class CacheTest {
  public:

util/coding.h

@@ -157,7 +157,7 @@ inline void PutFixed64(std::string* dst, uint64_t value) {
 inline void PutVarint32(std::string* dst, uint32_t v) {
   char buf[5];
   char* ptr = EncodeVarint32(buf, v);
-  dst->append(buf, ptr - buf);
+  dst->append(buf, static_cast<size_t>(ptr - buf));
 }
 
 inline char* EncodeVarint64(char* dst, uint64_t v) {
@@ -174,11 +174,11 @@ inline char* EncodeVarint64(char* dst, uint64_t v) {
 inline void PutVarint64(std::string* dst, uint64_t v) {
   char buf[10];
   char* ptr = EncodeVarint64(buf, v);
-  dst->append(buf, ptr - buf);
+  dst->append(buf, static_cast<size_t>(ptr - buf));
 }
 
 inline void PutLengthPrefixedSlice(std::string* dst, const Slice& value) {
-  PutVarint32(dst, value.size());
+  PutVarint32(dst, static_cast<uint32_t>(value.size()));
   dst->append(value.data(), value.size());
 }
 
@@ -219,7 +219,7 @@ inline bool GetVarint32(Slice* input, uint32_t* value) {
   if (q == nullptr) {
     return false;
   } else {
-    *input = Slice(q, limit - q);
+    *input = Slice(q, static_cast<size_t>(limit - q));
     return true;
   }
 }
@@ -231,7 +231,7 @@ inline bool GetVarint64(Slice* input, uint64_t* value) {
   if (q == nullptr) {
     return false;
   } else {
-    *input = Slice(q, limit - q);
+    *input = Slice(q, static_cast<size_t>(limit - q));
     return true;
   }
 }

util/crc32c.cc

@@ -298,14 +298,14 @@ static inline uint64_t LE_LOAD64(const uint8_t *p) {
 #endif
 
 static inline void Slow_CRC32(uint64_t* l, uint8_t const **p) {
-  uint32_t c = *l ^ LE_LOAD32(*p);
+  uint32_t c = static_cast<uint32_t>(*l ^ LE_LOAD32(*p));
   *p += 4;
   *l = table3_[c & 0xff] ^
   table2_[(c >> 8) & 0xff] ^
   table1_[(c >> 16) & 0xff] ^
   table0_[c >> 24];
   // DO it twice.
-  c = *l ^ LE_LOAD32(*p);
+  c = static_cast<uint32_t>(*l ^ LE_LOAD32(*p));
   *p += 4;
   *l = table3_[c & 0xff] ^
   table2_[(c >> 8) & 0xff] ^
@@ -362,7 +362,7 @@ uint32_t ExtendImpl(uint32_t crc, const char* buf, size_t size) {
   }
 #undef STEP1
 #undef ALIGN
-  return l ^ 0xffffffffu;
+  return static_cast<uint32_t>(l ^ 0xffffffffu);
 }
 
 // Detect if SS42 or not.

util/dynamic_bloom_test.cc

@@ -153,15 +153,15 @@ TEST(DynamicBloomTest, perf) {
     return;
   }
 
-  for (uint64_t m = 1; m <= 8; ++m) {
+  for (uint32_t m = 1; m <= 8; ++m) {
     Arena arena;
-    const uint64_t num_keys = m * 8 * 1024 * 1024;
-    fprintf(stderr, "testing %" PRIu64 "M keys\n", m * 8);
+    const uint32_t num_keys = m * 8 * 1024 * 1024;
+    fprintf(stderr, "testing %" PRIu32 "M keys\n", m * 8);
 
     DynamicBloom std_bloom(&arena, num_keys * 10, 0, num_probes);
 
     timer.Start();
-    for (uint64_t i = 1; i <= num_keys; ++i) {
+    for (uint32_t i = 1; i <= num_keys; ++i) {
       std_bloom.Add(Slice(reinterpret_cast<const char*>(&i), 8));
     }
 
@@ -169,9 +169,9 @@ TEST(DynamicBloomTest, perf) {
     fprintf(stderr, "standard bloom, avg add latency %" PRIu64 "\n",
             elapsed / num_keys);
 
-    uint64_t count = 0;
+    uint32_t count = 0;
     timer.Start();
-    for (uint64_t i = 1; i <= num_keys; ++i) {
+    for (uint32_t i = 1; i <= num_keys; ++i) {
       if (std_bloom.MayContain(Slice(reinterpret_cast<const char*>(&i), 8))) {
         ++count;
       }
@@ -185,7 +185,7 @@ TEST(DynamicBloomTest, perf) {
     DynamicBloom blocked_bloom(&arena, num_keys * 10, 1, num_probes);
 
       timer.Start();
-      for (uint64_t i = 1; i <= num_keys; ++i) {
+      for (uint32_t i = 1; i <= num_keys; ++i) {
         blocked_bloom.Add(Slice(reinterpret_cast<const char*>(&i), 8));
       }
 
@@ -196,7 +196,7 @@ TEST(DynamicBloomTest, perf) {
 
       count = 0;
       timer.Start();
-      for (uint64_t i = 1; i <= num_keys; ++i) {
+      for (uint32_t i = 1; i <= num_keys; ++i) {
         if (blocked_bloom.MayContain(
                 Slice(reinterpret_cast<const char*>(&i), 8))) {
           ++count;

util/env_posix.cc

@@ -1594,7 +1594,8 @@ class PosixEnv : public Env {
         void (*function)(void*) = queue_.front().function;
         void* arg = queue_.front().arg;
         queue_.pop_front();
-        queue_len_.store(queue_.size(), std::memory_order_relaxed);
+        queue_len_.store(static_cast<unsigned int>(queue_.size()),
+                         std::memory_order_relaxed);
 
         bool decrease_io_priority = (low_io_priority != low_io_priority_);
         PthreadCall("unlock", pthread_mutex_unlock(&mu_));
@@ -1709,7 +1710,8 @@ class PosixEnv : public Env {
       queue_.push_back(BGItem());
       queue_.back().function = function;
       queue_.back().arg = arg;
-      queue_len_.store(queue_.size(), std::memory_order_relaxed);
+      queue_len_.store(static_cast<unsigned int>(queue_.size()),
+                       std::memory_order_relaxed);
 
       if (!HasExcessiveThread()) {
         // Wake up at least one waiting thread.

util/hash.cc

@@ -18,7 +18,7 @@ uint32_t Hash(const char* data, size_t n, uint32_t seed) {
   const uint32_t m = 0xc6a4a793;
   const uint32_t r = 24;
   const char* limit = data + n;
-  uint32_t h = seed ^ (n * m);
+  uint32_t h = static_cast<uint32_t>(seed ^ (n * m));
 
   // Pick up four bytes at a time
   while (data + 4 <= limit) {

util/hash_cuckoo_rep.cc

@@ -213,9 +213,10 @@ class HashCuckooRep : public MemTableRep {
     static const int kMurmurHashSeeds[HashCuckooRepFactory::kMaxHashCount] = {
         545609244,  1769731426, 763324157,  13099088,   592422103,
         1899789565, 248369300,  1984183468, 1613664382, 1491157517};
-    return MurmurHash(slice.data(), slice.size(),
+    return static_cast<unsigned int>(
+        MurmurHash(slice.data(), static_cast<int>(slice.size()),
                    kMurmurHashSeeds[hash_func_id]) %
-           bucket_count_;
+        bucket_count_);
   }
 
   // A cuckoo path is a sequence of bucket ids, where each id points to a

util/hash_linklist_rep.cc

@@ -200,7 +200,8 @@ class HashLinkListRep : public MemTableRep {
   }
 
   size_t GetHash(const Slice& slice) const {
-    return MurmurHash(slice.data(), slice.size(), 0) % bucket_size_;
+    return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0) %
+           bucket_size_;
   }
 
   Pointer* GetBucket(size_t i) const {

util/hash_skiplist_rep.cc

@@ -65,7 +65,8 @@ class HashSkipListRep : public MemTableRep {
   Arena* const arena_;
 
   inline size_t GetHash(const Slice& slice) const {
-    return MurmurHash(slice.data(), slice.size(), 0) % bucket_size_;
+    return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0) %
+           bucket_size_;
   }
   inline Bucket* GetBucket(size_t i) const {
     return buckets_[i].load(std::memory_order_acquire);

util/ldb_cmd.cc

@@ -971,8 +971,9 @@ void DBDumperCommand::DoCommand() {
   uint64_t s1=0,s2=0;
 
   // At this point, bucket_size=0 => time_range=0
-  uint64_t num_buckets = (bucket_size >= time_range) ? 1 :
-    ((time_range + bucket_size - 1) / bucket_size);
+  int num_buckets = (bucket_size >= time_range)
+                        ? 1
+                        : ((time_range + bucket_size - 1) / bucket_size);
   vector<uint64_t> bucket_counts(num_buckets, 0);
   if (is_db_ttl_ && !count_only_ && timestamp_ && !count_delim_) {
     fprintf(stdout, "Dumping key-values from %s to %s\n",

util/mock_env.cc

@@ -19,9 +19,14 @@ namespace rocksdb {
 
 class MemFile {
  public:
-  explicit MemFile(const std::string& fn) :
-    fn_(fn), refs_(0), size_(0), modified_time_(Now()),
-    rnd_((uint32_t)MurmurHash(fn.data(), fn.size(), 0)), fsynced_bytes_(0) {}
+  explicit MemFile(const std::string& fn)
+      : fn_(fn),
+        refs_(0),
+        size_(0),
+        modified_time_(Now()),
+        rnd_(static_cast<uint32_t>(
+            MurmurHash(fn.data(), static_cast<int>(fn.size()), 0))),
+        fsynced_bytes_(0) {}
 
   void Ref() {
     MutexLock lock(&mutex_);
@@ -61,7 +66,8 @@ class MemFile {
       return;
     }
     uint64_t buffered_bytes = size_ - fsynced_bytes_;
-    uint64_t start = fsynced_bytes_ + rnd_.Uniform(buffered_bytes);
+    uint64_t start =
+        fsynced_bytes_ + rnd_.Uniform(static_cast<int>(buffered_bytes));
     uint64_t end = std::min(start + 512, size_.load());
     MutexLock lock(&mutex_);
     for (uint64_t pos = start; pos < end; ++pos) {

util/murmurhash.h

@@ -36,7 +36,7 @@ typedef unsigned int murmur_t;
 namespace rocksdb {
 struct murmur_hash {
   size_t operator()(const Slice& slice) const {
-    return MurmurHash(slice.data(), slice.size(), 0);
+    return MurmurHash(slice.data(), static_cast<int>(slice.size()), 0);
   }
 };
 }  // rocksdb

util/mutable_cf_options.cc

@@ -110,7 +110,7 @@ void MutableCFOptions::Dump(Logger* log) const {
       expanded_compaction_factor);
   Log(log, "                 source_compaction_factor: %d",
       source_compaction_factor);
-  Log(log, "                    target_file_size_base: %d",
+  Log(log, "                    target_file_size_base: %" PRIu64,
       target_file_size_base);
   Log(log, "              target_file_size_multiplier: %d",
       target_file_size_multiplier);

util/mutable_cf_options.h

@@ -108,7 +108,7 @@ struct MutableCFOptions {
   int max_grandparent_overlap_factor;
   int expanded_compaction_factor;
   int source_compaction_factor;
-  int target_file_size_base;
+  uint64_t target_file_size_base;
   int target_file_size_multiplier;
   uint64_t max_bytes_for_level_base;
   int max_bytes_for_level_multiplier;

util/options_builder.cc

@@ -95,7 +95,7 @@ void PickWriteBufferSize(size_t total_write_buffer_limit, Options* options) {
 
   options->write_buffer_size = write_buffer_size;
   options->max_write_buffer_number =
-      total_write_buffer_limit / write_buffer_size;
+      static_cast<int>(total_write_buffer_limit / write_buffer_size);
   options->min_write_buffer_number_to_merge = 1;
 }
 
@@ -147,10 +147,10 @@ void OptimizeForLevel(int read_amplification_threshold,
 
   // This doesn't consider compaction and overheads of mem tables. But usually
   // it is in the same order of magnitude.
-  int expected_level0_compaction_size =
+  size_t expected_level0_compaction_size =
       options->level0_file_num_compaction_trigger * options->write_buffer_size;
   // Enlarge level1 target file size if level0 compaction size is larger.
-  int max_bytes_for_level_base = 10 * kBytesForOneMb;
+  uint64_t max_bytes_for_level_base = 10 * kBytesForOneMb;
   if (expected_level0_compaction_size > max_bytes_for_level_base) {
     max_bytes_for_level_base = expected_level0_compaction_size;
   }
@@ -160,7 +160,7 @@ void OptimizeForLevel(int read_amplification_threshold,
 
   const int kMinFileSize = 2 * kBytesForOneMb;
   // Allow at least 3-way parallelism for compaction between level 1 and 2.
-  int max_file_size = max_bytes_for_level_base / 3;
+  uint64_t max_file_size = max_bytes_for_level_base / 3;
   if (max_file_size < kMinFileSize) {
     options->target_file_size_base = kMinFileSize;
   } else {

util/options_helper.cc

@@ -40,12 +40,10 @@ bool ParseBoolean(const std::string& type, const std::string& value) {
     throw type;
   }
 }
-uint32_t ParseInt(const std::string& value) {
-  return std::stoi(value);
-}
+int ParseInt(const std::string& value) { return std::stoi(value); }
 
 uint32_t ParseUint32(const std::string& value) {
-  return std::stoul(value);
+  return static_cast<uint32_t>(std::stoul(value));
 }
 
 uint64_t ParseUint64(const std::string& value) {
@@ -82,9 +80,9 @@ bool ParseMemtableOptions(const std::string& name, const std::string& value,
   } else if (name == "arena_block_size") {
     new_options->arena_block_size = ParseInt64(value);
   } else if (name == "memtable_prefix_bloom_bits") {
-    new_options->memtable_prefix_bloom_bits = stoul(value);
+    new_options->memtable_prefix_bloom_bits = ParseUint32(value);
   } else if (name == "memtable_prefix_bloom_probes") {
-    new_options->memtable_prefix_bloom_probes = stoul(value);
+    new_options->memtable_prefix_bloom_probes = ParseUint32(value);
   } else if (name == "memtable_prefix_bloom_huge_page_tlb_size") {
     new_options->memtable_prefix_bloom_huge_page_tlb_size =
       ParseInt64(value);

util/rate_limiter.cc

@@ -47,7 +47,8 @@ GenericRateLimiter::GenericRateLimiter(
 GenericRateLimiter::~GenericRateLimiter() {
   MutexLock g(&request_mutex_);
   stop_ = true;
-  requests_to_wait_ = queue_[Env::IO_LOW].size() + queue_[Env::IO_HIGH].size();
+  requests_to_wait_ = static_cast<int32_t>(queue_[Env::IO_LOW].size() +
+                                           queue_[Env::IO_HIGH].size());
   for (auto& r : queue_[Env::IO_HIGH]) {
     r->cv.Signal();
   }

util/rate_limiter_test.cc

@@ -30,12 +30,12 @@ TEST(RateLimiterTest, StartStop) {
 TEST(RateLimiterTest, Rate) {
   auto* env = Env::Default();
   struct Arg {
-    Arg(int64_t _target_rate, int _burst)
+    Arg(int32_t _target_rate, int _burst)
         : limiter(new GenericRateLimiter(_target_rate, 100 * 1000, 10)),
           request_size(_target_rate / 10),
           burst(_burst) {}
     std::unique_ptr<RateLimiter> limiter;
-    int64_t request_size;
+    int32_t request_size;
     int burst;
   };
 
@@ -51,13 +51,12 @@ TEST(RateLimiterTest, Rate) {
         arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
                               Env::IO_HIGH);
       }
-      arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1,
-                            Env::IO_LOW);
+      arg->limiter->Request(r.Uniform(arg->request_size - 1) + 1, Env::IO_LOW);
     }
   };
 
   for (int i = 1; i <= 16; i*=2) {
-    int64_t target = i * 1024 * 10;
+    int32_t target = i * 1024 * 10;
     Arg arg(target, i / 4 + 1);
     auto start = env->NowMicros();
     for (int t = 0; t < i; ++t) {
@@ -68,7 +67,7 @@ TEST(RateLimiterTest, Rate) {
     auto elapsed = env->NowMicros() - start;
     double rate = arg.limiter->GetTotalBytesThrough()
                   * 1000000.0 / elapsed;
-    fprintf(stderr, "request size [1 - %" PRIi64 "], limit %" PRIi64
+    fprintf(stderr, "request size [1 - %" PRIi32 "], limit %" PRIi32
                     " KB/sec, actual rate: %lf KB/sec, elapsed %.2lf seconds\n",
             arg.request_size - 1, target / 1024, rate / 1024,
             elapsed / 1000000.0);

util/status.cc

@@ -23,8 +23,8 @@ const char* Status::CopyState(const char* state) {
 
 Status::Status(Code _code, const Slice& msg, const Slice& msg2) : code_(_code) {
   assert(code_ != kOk);
-  const uint32_t len1 = msg.size();
-  const uint32_t len2 = msg2.size();
+  const uint32_t len1 = static_cast<uint32_t>(msg.size());
+  const uint32_t len2 = static_cast<uint32_t>(msg2.size());
   const uint32_t size = len1 + (len2 ? (2 + len2) : 0);
   char* result = new char[size + 4];
   memcpy(result, &size, sizeof(size));

utilities/backupable/backupable_db.cc

@@ -54,7 +54,8 @@ class BackupRateLimiter {
         (bytes_since_start_ * kMicrosInSecond) / max_bytes_per_second_;
 
     if (should_take_micros > interval) {
-      env_->SleepForMicroseconds(should_take_micros - interval);
+      env_->SleepForMicroseconds(
+          static_cast<int>(should_take_micros - interval));
       now = env_->NowMicros();
     }
     // reset interval
@@ -165,9 +166,7 @@ class BackupEngineImpl : public BackupEngine {
     uint64_t GetSize() const {
       return size_;
     }
-    uint32_t GetNumberFiles() {
-      return files_.size();
-    }
+    uint32_t GetNumberFiles() { return static_cast<uint32_t>(files_.size()); }
     void SetSequenceNumber(uint64_t sequence_number) {
       sequence_number_ = sequence_number;
     }