`compression_per_level` should be used for flush and changeable (#9658)

Summary:
- Make `compression_per_level` dynamical changeable with `SetOptions`;
- Fix a bug that `compression_per_level` is not used for flush;

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9658

Test Plan: CI

Reviewed By: ajkr

Differential Revision: D34700749

Pulled By: jay-zhuang

fbshipit-source-id: a23b9dfa7ad03d393c1d71781d19e91de796f49c

HISTORY.md

@@ -8,9 +8,11 @@
 ### Bug Fixes
 * Fixed a data race on `versions_` between `DBImpl::ResumeImpl()` and threads waiting for recovery to complete (#9496)
 * Fixed a bug caused by race among flush, incoming writes and taking snapshots. Queries to snapshots created with these race condition can return incorrect result, e.g. resurfacing deleted data.
+* Fixed a bug that DB flush uses `options.compression` even `options.compression_per_level` is set.
 
 ### Public API changes
 * Remove BlockBasedTableOptions.hash_index_allow_collision which already takes no effect.
+* `options.compression_per_level` is dynamically changeable with `SetOptions()`.
 
 ### Bug Fixes
 * Fix a race condition when cancel manual compaction with `DisableManualCompaction`. Also DB close can cancel the manual compaction thread.

db/compaction/compaction.cc

@@ -277,9 +277,9 @@ Compaction::~Compaction() {
 
 bool Compaction::InputCompressionMatchesOutput() const {
   int base_level = input_vstorage_->base_level();
-  bool matches = (GetCompressionType(immutable_options_, input_vstorage_,
-                                     mutable_cf_options_, start_level_,
-                                     base_level) == output_compression_);
+  bool matches =
+      (GetCompressionType(input_vstorage_, mutable_cf_options_, start_level_,
+                          base_level) == output_compression_);
   if (matches) {
     TEST_SYNC_POINT("Compaction::InputCompressionMatchesOutput:Matches");
     return true;

db/compaction/compaction_picker.cc

@@ -100,8 +100,7 @@ bool FindIntraL0Compaction(const std::vector<FileMetaData*>& level_files,
 // If enable_compression is false, then compression is always disabled no
 // matter what the values of the other two parameters are.
 // Otherwise, the compression type is determined based on options and level.
-CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
-                                   const VersionStorageInfo* vstorage,
+CompressionType GetCompressionType(const VersionStorageInfo* vstorage,
                                    const MutableCFOptions& mutable_cf_options,
                                    int level, int base_level,
                                    const bool enable_compression) {
@@ -118,17 +117,19 @@ CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
   }
   // If the user has specified a different compression level for each level,
   // then pick the compression for that level.
-  if (!ioptions.compression_per_level.empty()) {
+  if (!mutable_cf_options.compression_per_level.empty()) {
     assert(level == 0 || level >= base_level);
     int idx = (level == 0) ? 0 : level - base_level + 1;
 
-    const int n = static_cast<int>(ioptions.compression_per_level.size()) - 1;
+    const int n =
+        static_cast<int>(mutable_cf_options.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
     // belongs to.  Likewise, if level is beyond the end of the
     // specified compression levels, use the last value.
-    return ioptions.compression_per_level[std::max(0, std::min(idx, n))];
+    return mutable_cf_options
+        .compression_per_level[std::max(0, std::min(idx, n))];
   } else {
     return mutable_cf_options.compression;
   }
@@ -347,9 +348,8 @@ Compaction* CompactionPicker::CompactFiles(
     } else {
       base_level = 1;
     }
-    compression_type =
-        GetCompressionType(ioptions_, vstorage, mutable_cf_options,
-                           output_level, base_level);
+    compression_type = GetCompressionType(vstorage, mutable_cf_options,
+                                          output_level, base_level);
   } else {
     // TODO(ajkr): `CompactionOptions` offers configurable `CompressionType`
     // without configurable `CompressionOptions`, which is inconsistent.
@@ -637,8 +637,7 @@ Compaction* CompactionPicker::CompactRange(
                             ioptions_.compaction_style),
         /* max_compaction_bytes */ LLONG_MAX,
         compact_range_options.target_path_id,
-        GetCompressionType(ioptions_, vstorage, mutable_cf_options,
-                           output_level, 1),
+        GetCompressionType(vstorage, mutable_cf_options, output_level, 1),
         GetCompressionOptions(mutable_cf_options, vstorage, output_level),
         Temperature::kUnknown, compact_range_options.max_subcompactions,
         /* grandparents */ {},
@@ -816,7 +815,7 @@ Compaction* CompactionPicker::CompactRange(
                           ioptions_.level_compaction_dynamic_level_bytes),
       mutable_cf_options.max_compaction_bytes,
       compact_range_options.target_path_id,
-      GetCompressionType(ioptions_, vstorage, mutable_cf_options, output_level,
+      GetCompressionType(vstorage, mutable_cf_options, output_level,
                          vstorage->base_level()),
       GetCompressionOptions(mutable_cf_options, vstorage, output_level),
       Temperature::kUnknown, compact_range_options.max_subcompactions,

db/compaction/compaction_picker.h

@@ -304,8 +304,7 @@ bool FindIntraL0Compaction(
     CompactionInputFiles* comp_inputs,
     SequenceNumber earliest_mem_seqno = kMaxSequenceNumber);
 
-CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
-                                   const VersionStorageInfo* vstorage,
+CompressionType GetCompressionType(const VersionStorageInfo* vstorage,
                                    const MutableCFOptions& mutable_cf_options,
                                    int level, int base_level,
                                    const bool enable_compression = true);

db/compaction/compaction_picker_level.cc

@@ -343,8 +343,8 @@ Compaction* LevelCompactionBuilder::GetCompaction() {
                           ioptions_.level_compaction_dynamic_level_bytes),
       mutable_cf_options_.max_compaction_bytes,
       GetPathId(ioptions_, mutable_cf_options_, output_level_),
-      GetCompressionType(ioptions_, vstorage_, mutable_cf_options_,
-                         output_level_, vstorage_->base_level()),
+      GetCompressionType(vstorage_, mutable_cf_options_, output_level_,
+                         vstorage_->base_level()),
       GetCompressionOptions(mutable_cf_options_, vstorage_, output_level_),
       Temperature::kUnknown,
       /* max_subcompactions */ 0, std::move(grandparents_), is_manual_,

db/compaction/compaction_picker_universal.cc

@@ -746,19 +746,19 @@ Compaction* UniversalCompactionBuilder::PickCompactionToReduceSortedRuns(
   } else {
     compaction_reason = CompactionReason::kUniversalSortedRunNum;
   }
-  return new Compaction(
-      vstorage_, ioptions_, mutable_cf_options_, mutable_db_options_,
-      std::move(inputs), output_level,
-      MaxFileSizeForLevel(mutable_cf_options_, output_level,
-                          kCompactionStyleUniversal),
-      GetMaxOverlappingBytes(), path_id,
-      GetCompressionType(ioptions_, vstorage_, mutable_cf_options_, start_level,
-                         1, enable_compression),
-      GetCompressionOptions(mutable_cf_options_, vstorage_, start_level,
-                            enable_compression),
-      Temperature::kUnknown,
-      /* max_subcompactions */ 0, grandparents, /* is manual */ false, score_,
-      false /* deletion_compaction */, compaction_reason);
+  return new Compaction(vstorage_, ioptions_, mutable_cf_options_,
+                        mutable_db_options_, std::move(inputs), output_level,
+                        MaxFileSizeForLevel(mutable_cf_options_, output_level,
+                                            kCompactionStyleUniversal),
+                        GetMaxOverlappingBytes(), path_id,
+                        GetCompressionType(vstorage_, mutable_cf_options_,
+                                           start_level, 1, enable_compression),
+                        GetCompressionOptions(mutable_cf_options_, vstorage_,
+                                              start_level, enable_compression),
+                        Temperature::kUnknown,
+                        /* max_subcompactions */ 0, grandparents,
+                        /* is manual */ false, score_,
+                        false /* deletion_compaction */, compaction_reason);
 }
 
 // Look at overall size amplification. If size amplification
@@ -1076,8 +1076,8 @@ Compaction* UniversalCompactionBuilder::PickIncrementalForReduceSizeAmp(
       MaxFileSizeForLevel(mutable_cf_options_, output_level,
                           kCompactionStyleUniversal),
       GetMaxOverlappingBytes(), path_id,
-      GetCompressionType(ioptions_, vstorage_, mutable_cf_options_,
-                         output_level, 1, true /* enable_compression */),
+      GetCompressionType(vstorage_, mutable_cf_options_, output_level, 1,
+                         true /* enable_compression */),
       GetCompressionOptions(mutable_cf_options_, vstorage_, output_level,
                             true /* enable_compression */),
       Temperature::kUnknown,
@@ -1220,8 +1220,7 @@ Compaction* UniversalCompactionBuilder::PickDeleteTriggeredCompaction() {
       MaxFileSizeForLevel(mutable_cf_options_, output_level,
                           kCompactionStyleUniversal),
       /* max_grandparent_overlap_bytes */ GetMaxOverlappingBytes(), path_id,
-      GetCompressionType(ioptions_, vstorage_, mutable_cf_options_,
-                         output_level, 1),
+      GetCompressionType(vstorage_, mutable_cf_options_, output_level, 1),
       GetCompressionOptions(mutable_cf_options_, vstorage_, output_level),
       Temperature::kUnknown,
       /* max_subcompactions */ 0, grandparents, /* is manual */ false, score_,
@@ -1294,8 +1293,8 @@ Compaction* UniversalCompactionBuilder::PickCompactionToOldest(
       MaxFileSizeForLevel(mutable_cf_options_, output_level,
                           kCompactionStyleUniversal),
       GetMaxOverlappingBytes(), path_id,
-      GetCompressionType(ioptions_, vstorage_, mutable_cf_options_,
-                         output_level, 1, true /* enable_compression */),
+      GetCompressionType(vstorage_, mutable_cf_options_, output_level, 1,
+                         true /* enable_compression */),
       GetCompressionOptions(mutable_cf_options_, vstorage_, output_level,
                             true /* enable_compression */),
       Temperature::kUnknown,

db/db_impl/db_impl.cc

@@ -119,18 +119,16 @@ CompressionType GetCompressionFlush(
   // Compressing memtable flushes might not help unless the sequential load
   // optimization is used for leveled compaction. Otherwise the CPU and
   // latency overhead is not offset by saving much space.
-  if (ioptions.compaction_style == kCompactionStyleUniversal) {
-    if (mutable_cf_options.compaction_options_universal
-            .compression_size_percent < 0) {
-      return mutable_cf_options.compression;
-    } else {
-      return kNoCompression;
-    }
-  } else if (!ioptions.compression_per_level.empty()) {
-    // For leveled compress when min_level_to_compress != 0.
-    return ioptions.compression_per_level[0];
-  } else {
+  if (ioptions.compaction_style == kCompactionStyleUniversal &&
+      mutable_cf_options.compaction_options_universal
+              .compression_size_percent >= 0) {
+    return kNoCompression;
+  }
+  if (mutable_cf_options.compression_per_level.empty()) {
     return mutable_cf_options.compression;
+  } else {
+    // For leveled compress when min_level_to_compress != 0.
+    return mutable_cf_options.compression_per_level[0];
   }
 }
 

db/db_properties_test.cc

@@ -1067,11 +1067,17 @@ TEST_F(DBPropertiesTest, EstimateCompressionRatio) {
   const int kNumEntriesPerFile = 1000;
 
   Options options = CurrentOptions();
-  options.compression_per_level = {kNoCompression, kSnappyCompression};
   options.disable_auto_compactions = true;
-  options.num_levels = 2;
+  options.num_levels = 3;
   Reopen(options);
 
+  ASSERT_OK(db_->SetOptions(
+      {{"compression_per_level", "kNoCompression:kSnappyCompression"}}));
+  auto opts = db_->GetOptions();
+  ASSERT_EQ(opts.compression_per_level.size(), 2);
+  ASSERT_EQ(opts.compression_per_level[0], kNoCompression);
+  ASSERT_EQ(opts.compression_per_level[1], kSnappyCompression);
+
   // compression ratio is -1.0 when no open files at level
   ASSERT_EQ(CompressionRatioAtLevel(0), -1.0);
 

include/rocksdb/advanced_options.h

@@ -471,6 +471,14 @@ struct AdvancedColumnFamilyOptions {
   // according to compression_per_level[1], L3 using compression_per_level[2]
   // and L4 using compression_per_level[3]. Compaction for each level can
   // change when data grows.
+  //
+  // NOTE: if the vector size is smaller than the level number, the undefined
+  // lower level uses the last option in the vector, for example, for 3 level
+  // LSM tree the following settings are the same:
+  // {kNoCompression, kSnappyCompression}
+  // {kNoCompression, kSnappyCompression, kSnappyCompression}
+  //
+  // Dynamically changeable through SetOptions() API
   std::vector<CompressionType> compression_per_level;
 
   // Number of levels for this database

options/cf_options.cc

@@ -441,6 +441,11 @@ static std::unordered_map<std::string, OptionTypeInfo>
          {offsetof(struct MutableCFOptions, bottommost_compression),
           OptionType::kCompressionType, OptionVerificationType::kNormal,
           OptionTypeFlags::kMutable}},
+        {"compression_per_level",
+         OptionTypeInfo::Vector<CompressionType>(
+             offsetof(struct MutableCFOptions, compression_per_level),
+             OptionVerificationType::kNormal, OptionTypeFlags::kMutable,
+             {0, OptionType::kCompressionType})},
         {kOptNameCompOpts,
          OptionTypeInfo::Struct(
              kOptNameCompOpts, &compression_options_type_info,
@@ -548,11 +553,6 @@ static std::unordered_map<std::string, OptionTypeInfo>
         {"rate_limit_delay_max_milliseconds",
          {0, OptionType::kUInt, OptionVerificationType::kDeprecated,
           OptionTypeFlags::kNone}},
-        {"compression_per_level",
-         OptionTypeInfo::Vector<CompressionType>(
-             offsetof(struct ImmutableCFOptions, compression_per_level),
-             OptionVerificationType::kNormal, OptionTypeFlags::kNone,
-             {0, OptionType::kCompressionType})},
         {"comparator",
          OptionTypeInfo::AsCustomRawPtr<const Comparator>(
              offsetof(struct ImmutableCFOptions, user_comparator),
@@ -849,7 +849,6 @@ ImmutableCFOptions::ImmutableCFOptions(const ColumnFamilyOptions& cf_options)
       table_properties_collector_factories(
           cf_options.table_properties_collector_factories),
       bloom_locality(cf_options.bloom_locality),
-      compression_per_level(cf_options.compression_per_level),
       level_compaction_dynamic_level_bytes(
           cf_options.level_compaction_dynamic_level_bytes),
       num_levels(cf_options.num_levels),

options/cf_options.h

@@ -62,8 +62,6 @@ struct ImmutableCFOptions {
   // to PlainTableOptions just like bloom_bits_per_key
   uint32_t bloom_locality;
 
-  std::vector<CompressionType> compression_per_level;
-
   bool level_compaction_dynamic_level_bytes;
 
   int num_levels;
@@ -154,7 +152,8 @@ struct MutableCFOptions {
         bottommost_compression_opts(options.bottommost_compression_opts),
         bottommost_temperature(options.bottommost_temperature),
         sample_for_compression(
-            options.sample_for_compression) {  // TODO: is 0 fine here?
+            options.sample_for_compression),  // TODO: is 0 fine here?
+        compression_per_level(options.compression_per_level) {
     RefreshDerivedOptions(options.num_levels, options.compaction_style);
   }
 
@@ -271,6 +270,7 @@ struct MutableCFOptions {
   Temperature bottommost_temperature;
 
   uint64_t sample_for_compression;
+  std::vector<CompressionType> compression_per_level;
 
   // Derived options
   // Per-level target file size.

options/options_helper.cc

@@ -263,6 +263,7 @@ void UpdateColumnFamilyOptions(const MutableCFOptions& moptions,
   cf_opts->bottommost_compression = moptions.bottommost_compression;
   cf_opts->bottommost_compression_opts = moptions.bottommost_compression_opts;
   cf_opts->sample_for_compression = moptions.sample_for_compression;
+  cf_opts->compression_per_level = moptions.compression_per_level;
   cf_opts->bottommost_temperature = moptions.bottommost_temperature;
 }
 
@@ -287,7 +288,6 @@ void UpdateColumnFamilyOptions(const ImmutableCFOptions& ioptions,
   cf_opts->table_properties_collector_factories =
       ioptions.table_properties_collector_factories;
   cf_opts->bloom_locality = ioptions.bloom_locality;
-  cf_opts->compression_per_level = ioptions.compression_per_level;
   cf_opts->level_compaction_dynamic_level_bytes =
       ioptions.level_compaction_dynamic_level_bytes;
   cf_opts->num_levels = ioptions.num_levels;

options/options_settable_test.cc

@@ -539,6 +539,8 @@ TEST_F(OptionsSettableTest, ColumnFamilyOptionsAllFieldsSettable) {
       {offsetof(struct MutableCFOptions,
                 max_bytes_for_level_multiplier_additional),
        sizeof(std::vector<int>)},
+      {offsetof(struct MutableCFOptions, compression_per_level),
+       sizeof(std::vector<CompressionType>)},
       {offsetof(struct MutableCFOptions, max_file_size),
        sizeof(std::vector<uint64_t>)},
   };

table/sst_file_writer.cc

@@ -242,9 +242,9 @@ Status SstFileWriter::Open(const std::string& file_path) {
     } else {
       compression_opts = r->mutable_cf_options.compression_opts;
     }
-  } else if (!r->ioptions.compression_per_level.empty()) {
+  } else if (!r->mutable_cf_options.compression_per_level.empty()) {
     // Use the compression of the last level if we have per level compression
-    compression_type = *(r->ioptions.compression_per_level.rbegin());
+    compression_type = *(r->mutable_cf_options.compression_per_level.rbegin());
     compression_opts = r->mutable_cf_options.compression_opts;
   } else {
     compression_type = r->mutable_cf_options.compression;