Readers for partition filter

Summary:
This is the last split of this pull request: https://github.com/facebook/rocksdb/pull/1891 which includes the reader part as well as the tests.
Closes https://github.com/facebook/rocksdb/pull/1961

Differential Revision: D4672216

Pulled By: maysamyabandeh

fbshipit-source-id: 6a2b829

Makefile

@@ -354,6 +354,7 @@ TESTS = \
 	file_reader_writer_test \
 	block_based_filter_block_test \
 	full_filter_block_test \
+	partitioned_filter_block_test \
 	hash_table_test \
 	histogram_test \
 	log_test \
@@ -1158,6 +1159,9 @@ block_based_filter_block_test: table/block_based_filter_block_test.o $(LIBOBJECT
 full_filter_block_test: table/full_filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 
+partitioned_filter_block_test: table/partitioned_filter_block_test.o $(LIBOBJECTS) $(TESTHARNESS)
+	$(AM_LINK)
+
 log_test: db/log_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 

db/db_bloom_filter_test.cc

@@ -20,17 +20,23 @@ class DBBloomFilterTest : public DBTestBase {
   DBBloomFilterTest() : DBTestBase("/db_bloom_filter_test") {}
 };
 
-class DBBloomFilterTestWithParam : public DBTestBase,
-                                   public testing::WithParamInterface<bool> {
+class DBBloomFilterTestWithParam
+    : public DBTestBase,
+      public testing::WithParamInterface<std::tuple<bool, bool>> {
+  //                             public testing::WithParamInterface<bool> {
  protected:
   bool use_block_based_filter_;
+  bool partition_filters_;
 
  public:
   DBBloomFilterTestWithParam() : DBTestBase("/db_bloom_filter_tests") {}
 
   ~DBBloomFilterTestWithParam() {}
 
-  void SetUp() override { use_block_based_filter_ = GetParam(); }
+  void SetUp() override {
+    use_block_based_filter_ = std::get<0>(GetParam());
+    partition_filters_ = std::get<1>(GetParam());
+  }
 };
 
 // KeyMayExist can lead to a few false positives, but not false negatives.
@@ -43,7 +49,17 @@ TEST_P(DBBloomFilterTestWithParam, KeyMayExist) {
     anon::OptionsOverride options_override;
     options_override.filter_policy.reset(
         NewBloomFilterPolicy(20, use_block_based_filter_));
+    options_override.partition_filters = partition_filters_;
+    options_override.index_per_partition = 2;
     Options options = CurrentOptions(options_override);
+    if (partition_filters_ &&
+        static_cast<BlockBasedTableOptions*>(
+            options.table_factory->GetOptions())
+                ->index_type != BlockBasedTableOptions::kTwoLevelIndexSearch) {
+      // In the current implementation partitioned filters depend on partitioned
+      // indexes
+      continue;
+    }
     options.statistics = rocksdb::CreateDBStatistics();
     CreateAndReopenWithCF({"pikachu"}, options);
 
@@ -102,11 +118,16 @@ TEST_P(DBBloomFilterTestWithParam, KeyMayExist) {
 }
 
 TEST_F(DBBloomFilterTest, GetFilterByPrefixBloom) {
+  for (bool partition_filters : {true, false}) {
     Options options = last_options_;
     options.prefix_extractor.reset(NewFixedPrefixTransform(8));
     options.statistics = rocksdb::CreateDBStatistics();
     BlockBasedTableOptions bbto;
     bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
+    if (partition_filters) {
+      bbto.partition_filters = true;
+      bbto.index_type = BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+    }
     bbto.whole_key_filtering = false;
     options.table_factory.reset(NewBlockBasedTableFactory(bbto));
     DestroyAndReopen(options);
@@ -140,8 +161,10 @@ TEST_F(DBBloomFilterTest, GetFilterByPrefixBloom) {
     ASSERT_TRUE(db_->Get(ro, "foobarbar", &value).IsNotFound());
     ASSERT_EQ(TestGetTickerCount(options, BLOOM_FILTER_USEFUL), 2);
   }
+}
 
 TEST_F(DBBloomFilterTest, WholeKeyFilterProp) {
+  for (bool partition_filters : {true, false}) {
     Options options = last_options_;
     options.prefix_extractor.reset(NewFixedPrefixTransform(3));
     options.statistics = rocksdb::CreateDBStatistics();
@@ -149,6 +172,10 @@ TEST_F(DBBloomFilterTest, WholeKeyFilterProp) {
     BlockBasedTableOptions bbto;
     bbto.filter_policy.reset(NewBloomFilterPolicy(10, false));
     bbto.whole_key_filtering = false;
+    if (partition_filters) {
+      bbto.partition_filters = true;
+      bbto.index_type = BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+    }
     options.table_factory.reset(NewBlockBasedTableFactory(bbto));
     DestroyAndReopen(options);
 
@@ -289,6 +316,7 @@ TEST_F(DBBloomFilterTest, WholeKeyFilterProp) {
     ASSERT_EQ("bar", Get("barfoo"));
     ASSERT_EQ(TestGetTickerCount(options, BLOOM_FILTER_USEFUL), 12);
   }
+}
 
 TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
   do {
@@ -301,6 +329,12 @@ TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
     table_options.no_block_cache = true;
     table_options.filter_policy.reset(
         NewBloomFilterPolicy(10, use_block_based_filter_));
+    table_options.partition_filters = partition_filters_;
+    if (partition_filters_) {
+      table_options.index_type =
+          BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+    }
+    table_options.index_per_partition = 2;
     options.table_factory.reset(NewBlockBasedTableFactory(table_options));
 
     CreateAndReopenWithCF({"pikachu"}, options);
@@ -327,7 +361,13 @@ TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
     int reads = env_->random_read_counter_.Read();
     fprintf(stderr, "%d present => %d reads\n", N, reads);
     ASSERT_GE(reads, N);
+    if (partition_filters_) {
+      // Without block cache, we read an extra partition filter per each
+      // level*read and a partition index per each read
+      ASSERT_LE(reads, 4 * N + 2 * N / 100);
+    } else {
       ASSERT_LE(reads, N + 2 * N / 100);
+    }
 
     // Lookup present keys.  Should rarely read from either sstable.
     env_->random_read_counter_.Reset();
@@ -336,7 +376,13 @@ TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
     }
     reads = env_->random_read_counter_.Read();
     fprintf(stderr, "%d missing => %d reads\n", N, reads);
+    if (partition_filters_) {
+      // With partitioned filter we read one extra filter per level per each
+      // missed read.
+      ASSERT_LE(reads, 2 * N + 3 * N / 100);
+    } else {
       ASSERT_LE(reads, 3 * N / 100);
+    }
 
     env_->delay_sstable_sync_.store(false, std::memory_order_release);
     Close();
@@ -344,7 +390,9 @@ TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
 }
 
 INSTANTIATE_TEST_CASE_P(DBBloomFilterTestWithParam, DBBloomFilterTestWithParam,
-                        ::testing::Bool());
+                        ::testing::Values(std::make_tuple(true, false),
+                                          std::make_tuple(false, true),
+                                          std::make_tuple(false, false)));
 
 TEST_F(DBBloomFilterTest, BloomFilterRate) {
   while (ChangeFilterOptions()) {
@@ -401,14 +449,35 @@ TEST_F(DBBloomFilterTest, BloomFilterCompatibility) {
     ASSERT_EQ(Key(i), Get(1, Key(i)));
   }
   ASSERT_EQ(TestGetTickerCount(options, BLOOM_FILTER_USEFUL), 0);
+
+  // Check db with partitioned full filter
+  table_options.partition_filters = true;
+  table_options.index_type =
+      BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+  table_options.filter_policy.reset(NewBloomFilterPolicy(10, false));
+  options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+  ReopenWithColumnFamilies({"default", "pikachu"}, options);
+
+  // Check if they can be found
+  for (int i = 0; i < maxKey; i++) {
+    ASSERT_EQ(Key(i), Get(1, Key(i)));
+  }
+  ASSERT_EQ(TestGetTickerCount(options, BLOOM_FILTER_USEFUL), 0);
 }
 
 TEST_F(DBBloomFilterTest, BloomFilterReverseCompatibility) {
+  for (bool partition_filters : {true, false}) {
     Options options = CurrentOptions();
     options.statistics = rocksdb::CreateDBStatistics();
     BlockBasedTableOptions table_options;
+    if (partition_filters) {
+      table_options.partition_filters = true;
+      table_options.index_type =
+          BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+    }
     table_options.filter_policy.reset(NewBloomFilterPolicy(10, false));
     options.table_factory.reset(NewBlockBasedTableFactory(table_options));
+    DestroyAndReopen(options);
 
     // Create with full filter
     CreateAndReopenWithCF({"pikachu"}, options);
@@ -431,6 +500,7 @@ TEST_F(DBBloomFilterTest, BloomFilterReverseCompatibility) {
     }
     ASSERT_EQ(TestGetTickerCount(options, BLOOM_FILTER_USEFUL), 0);
   }
+}
 
 namespace {
 // A wrapped bloom over default FilterPolicy
@@ -586,11 +656,12 @@ TEST_F(DBBloomFilterTest, PrefixExtractorBlockFilter) {
 #ifndef ROCKSDB_LITE
 class BloomStatsTestWithParam
     : public DBBloomFilterTest,
-      public testing::WithParamInterface<std::tuple<bool, bool>> {
+      public testing::WithParamInterface<std::tuple<bool, bool, bool>> {
  public:
   BloomStatsTestWithParam() {
     use_block_table_ = std::get<0>(GetParam());
     use_block_based_builder_ = std::get<1>(GetParam());
+    partition_filters_ = std::get<2>(GetParam());
 
     options_.create_if_missing = true;
     options_.prefix_extractor.reset(rocksdb::NewFixedPrefixTransform(4));
@@ -599,10 +670,17 @@ class BloomStatsTestWithParam
     if (use_block_table_) {
       BlockBasedTableOptions table_options;
       table_options.hash_index_allow_collision = false;
+      if (partition_filters_) {
+        assert(!use_block_based_builder_);
+        table_options.partition_filters = partition_filters_;
+        table_options.index_type =
+            BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+      }
       table_options.filter_policy.reset(
           NewBloomFilterPolicy(10, use_block_based_builder_));
       options_.table_factory.reset(NewBlockBasedTableFactory(table_options));
     } else {
+      assert(!partition_filters_);  // not supported in plain table
       PlainTableOptions table_options;
       options_.table_factory.reset(NewPlainTableFactory(table_options));
     }
@@ -623,6 +701,7 @@ class BloomStatsTestWithParam
 
   bool use_block_table_;
   bool use_block_based_builder_;
+  bool partition_filters_;
   Options options_;
 };
 
@@ -717,25 +796,44 @@ TEST_P(BloomStatsTestWithParam, BloomStatsTestWithIter) {
   ASSERT_OK(iter->status());
   ASSERT_TRUE(iter->Valid());
   ASSERT_EQ(value1, iter->value().ToString());
+  if (partition_filters_) {
+    ASSERT_EQ(0, perf_context.bloom_sst_hit_count);   // no_io
+    ASSERT_EQ(0, perf_context.bloom_sst_miss_count);  // no_io
+  } else {
     ASSERT_EQ(1, perf_context.bloom_sst_hit_count);
+  }
 
   iter->Seek(key3);
   ASSERT_OK(iter->status());
   ASSERT_TRUE(iter->Valid());
   ASSERT_EQ(value3, iter->value().ToString());
+  if (partition_filters_) {
+    ASSERT_EQ(0, perf_context.bloom_sst_hit_count);   // no_io
+    ASSERT_EQ(0, perf_context.bloom_sst_miss_count);  // no_io
+  } else {
     ASSERT_EQ(2, perf_context.bloom_sst_hit_count);
+  }
 
   iter->Seek(key2);
   ASSERT_OK(iter->status());
+  if (partition_filters_) {
+    // iter is still valid since filter did not reject the key2
+    ASSERT_TRUE(iter->Valid());
+    ASSERT_EQ(0, perf_context.bloom_sst_hit_count);   // no_io
+    ASSERT_EQ(0, perf_context.bloom_sst_miss_count);  // no_io
+  } else {
     ASSERT_TRUE(!iter->Valid());
     ASSERT_EQ(1, perf_context.bloom_sst_miss_count);
     ASSERT_EQ(2, perf_context.bloom_sst_hit_count);
   }
+}
 
 INSTANTIATE_TEST_CASE_P(BloomStatsTestWithParam, BloomStatsTestWithParam,
-                        ::testing::Values(std::make_tuple(true, true),
-                                          std::make_tuple(true, false),
-                                          std::make_tuple(false, false)));
+                        ::testing::Values(std::make_tuple(true, true, false),
+                                          std::make_tuple(true, false, false),
+                                          std::make_tuple(true, false, true),
+                                          std::make_tuple(false, false,
+                                                          false)));
 
 namespace {
 void PrefixScanInit(DBBloomFilterTest* dbtest) {

db/db_test2.cc

@@ -1221,7 +1221,7 @@ class PinL0IndexAndFilterBlocksTest : public DBTestBase,
   PinL0IndexAndFilterBlocksTest() : DBTestBase("/db_pin_l0_index_bloom_test") {}
   virtual void SetUp() override { infinite_max_files_ = GetParam(); }
 
-  void CreateTwoLevels(Options* options) {
+  void CreateTwoLevels(Options* options, bool close_afterwards) {
     if (infinite_max_files_) {
       options->max_open_files = -1;
     }
@@ -1249,6 +1249,9 @@ class PinL0IndexAndFilterBlocksTest : public DBTestBase,
     Put(1, "z2", "end2");
     ASSERT_OK(Flush(1));
 
+    if (close_afterwards) {
+      Close();  // This ensures that there is no ref to block cache entries
+    }
     table_options.block_cache->EraseUnRefEntries();
   }
 
@@ -1303,7 +1306,7 @@ TEST_P(PinL0IndexAndFilterBlocksTest,
 TEST_P(PinL0IndexAndFilterBlocksTest,
        MultiLevelIndexAndFilterBlocksCachedWithPinning) {
   Options options = CurrentOptions();
-  PinL0IndexAndFilterBlocksTest::CreateTwoLevels(&options);
+  PinL0IndexAndFilterBlocksTest::CreateTwoLevels(&options, false);
   // get base cache values
   uint64_t fm = TestGetTickerCount(options, BLOCK_CACHE_FILTER_MISS);
   uint64_t fh = TestGetTickerCount(options, BLOCK_CACHE_FILTER_HIT);
@@ -1332,7 +1335,10 @@ TEST_P(PinL0IndexAndFilterBlocksTest,
 
 TEST_P(PinL0IndexAndFilterBlocksTest, DisablePrefetchingNonL0IndexAndFilter) {
   Options options = CurrentOptions();
-  PinL0IndexAndFilterBlocksTest::CreateTwoLevels(&options);
+  // This ensures that db does not ref anything in the block cache, so
+  // EraseUnRefEntries could clear them up.
+  bool close_afterwards = true;
+  PinL0IndexAndFilterBlocksTest::CreateTwoLevels(&options, close_afterwards);
 
   // Get base cache values
   uint64_t fm = TestGetTickerCount(options, BLOCK_CACHE_FILTER_MISS);

db/db_test_util.cc

@@ -230,6 +230,8 @@ bool DBTestBase::ChangeFilterOptions() {
     option_config_ = kFilter;
   } else if (option_config_ == kFilter) {
     option_config_ = kFullFilterWithNewTableReaderForCompactions;
+  } else if (option_config_ == kFullFilterWithNewTableReaderForCompactions) {
+    option_config_ = kPartitionedFilterWithNewTableReaderForCompactions;
   } else {
     return false;
   }
@@ -325,6 +327,14 @@ Options DBTestBase::CurrentOptions(
       options.new_table_reader_for_compaction_inputs = true;
       options.compaction_readahead_size = 10 * 1024 * 1024;
       break;
+    case kPartitionedFilterWithNewTableReaderForCompactions:
+      table_options.filter_policy.reset(NewBloomFilterPolicy(10, false));
+      table_options.partition_filters = true;
+      table_options.index_type =
+          BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
+      options.new_table_reader_for_compaction_inputs = true;
+      options.compaction_readahead_size = 10 * 1024 * 1024;
+      break;
     case kUncompressed:
       options.compression = kNoCompression;
       break;
@@ -426,6 +436,8 @@ Options DBTestBase::CurrentOptions(
 
   if (options_override.filter_policy) {
     table_options.filter_policy = options_override.filter_policy;
+    table_options.partition_filters = options_override.partition_filters;
+    table_options.index_per_partition = options_override.index_per_partition;
   }
   if (set_block_based_table_factory) {
     options.table_factory.reset(NewBlockBasedTableFactory(table_options));

db/db_test_util.h

@@ -109,6 +109,11 @@ class AtomicCounter {
 
 struct OptionsOverride {
   std::shared_ptr<const FilterPolicy> filter_policy = nullptr;
+  // These will be used only if filter_policy is set
+  bool partition_filters = false;
+  uint64_t index_per_partition = 1024;
+  BlockBasedTableOptions::IndexType index_type =
+      BlockBasedTableOptions::IndexType::kBinarySearch;
 
   // Used as a bit mask of individual enums in which to skip an XF test point
   int skip_policy = 0;
@@ -617,6 +622,7 @@ class DBTestBase : public testing::Test {
     kUniversalSubcompactions = 32,
     kBlockBasedTableWithIndexRestartInterval = 33,
     kBlockBasedTableWithPartitionedIndex = 34,
+    kPartitionedFilterWithNewTableReaderForCompactions = 35,
   };
   int option_config_;
 

table/block_based_filter_block.cc

@@ -184,8 +184,9 @@ BlockBasedFilterBlockReader::BlockBasedFilterBlockReader(
   num_ = (n - 5 - last_word) / 4;
 }
 
-bool BlockBasedFilterBlockReader::KeyMayMatch(const Slice& key,
-                                              uint64_t block_offset) {
+bool BlockBasedFilterBlockReader::KeyMayMatch(
+    const Slice& key, uint64_t block_offset, const bool no_io,
+    const Slice* const const_ikey_ptr) {
   assert(block_offset != kNotValid);
   if (!whole_key_filtering_) {
     return true;
@@ -193,8 +194,9 @@ bool BlockBasedFilterBlockReader::KeyMayMatch(const Slice& key,
   return MayMatch(key, block_offset);
 }
 
-bool BlockBasedFilterBlockReader::PrefixMayMatch(const Slice& prefix,
-                                                 uint64_t block_offset) {
+bool BlockBasedFilterBlockReader::PrefixMayMatch(
+    const Slice& prefix, uint64_t block_offset, const bool no_io,
+    const Slice* const const_ikey_ptr) {
   assert(block_offset != kNotValid);
   if (!prefix_extractor_) {
     return true;

table/block_based_filter_block.h

@@ -81,10 +81,14 @@ class BlockBasedFilterBlockReader : public FilterBlockReader {
                               bool whole_key_filtering,
                               BlockContents&& contents, Statistics* statistics);
   virtual bool IsBlockBased() override { return true; }
-  virtual bool KeyMayMatch(const Slice& key,
-                           uint64_t block_offset = kNotValid) override;
-  virtual bool PrefixMayMatch(const Slice& prefix,
-                              uint64_t block_offset = kNotValid) override;
+  virtual bool KeyMayMatch(
+      const Slice& key, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
+  virtual bool PrefixMayMatch(
+      const Slice& prefix, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
   virtual size_t ApproximateMemoryUsage() const override;
 
   // convert this object to a human readable form

table/block_based_table_reader.cc

@@ -37,6 +37,7 @@
 #include "table/get_context.h"
 #include "table/internal_iterator.h"
 #include "table/meta_blocks.h"
+#include "table/partitioned_filter_block.h"
 #include "table/persistent_cache_helper.h"
 #include "table/sst_file_writer_collectors.h"
 #include "table/two_level_iterator.h"
@@ -149,7 +150,7 @@ Cache::Handle* GetEntryFromCache(Cache* block_cache, const Slice& key,
 }  // namespace
 
 // Index that allows binary search lookup in a two-level index structure.
-class PartitionIndexReader : public IndexReader {
+class PartitionIndexReader : public IndexReader, public Cleanable {
  public:
   // Read the partition index from the file and create an instance for
   // `PartitionIndexReader`.
@@ -159,7 +160,8 @@ class PartitionIndexReader : public IndexReader {
                        const Footer& footer, const BlockHandle& index_handle,
                        const ImmutableCFOptions& ioptions,
                        const Comparator* comparator, IndexReader** index_reader,
-                       const PersistentCacheOptions& cache_options) {
+                       const PersistentCacheOptions& cache_options,
+                       const int level) {
     std::unique_ptr<Block> index_block;
     auto s = ReadBlockFromFile(
         file, footer, ReadOptions(), index_handle, &index_block, ioptions,
@@ -167,8 +169,9 @@ class PartitionIndexReader : public IndexReader {
         kDisableGlobalSequenceNumber, 0 /* read_amp_bytes_per_bit */);
 
     if (s.ok()) {
-      *index_reader = new PartitionIndexReader(
-          table, comparator, std::move(index_block), ioptions.statistics);
+      *index_reader =
+          new PartitionIndexReader(table, comparator, std::move(index_block),
+                                   ioptions.statistics, level);
     }
 
     return s;
@@ -177,10 +180,25 @@ class PartitionIndexReader : public IndexReader {
   // return a two-level iterator: first level is on the partition index
   virtual InternalIterator* NewIterator(BlockIter* iter = nullptr,
                                         bool dont_care = true) override {
+    // Filters are already checked before seeking the index
+    const bool skip_filters = true;
+    const bool is_index = true;
+    Cleanable* block_cache_cleaner = nullptr;
+    const bool pin_cached_indexes =
+        level_ == 0 &&
+        table_->rep_->table_options.pin_l0_filter_and_index_blocks_in_cache;
+    if (pin_cached_indexes) {
+      // Keep partition indexes into the cache as long as the partition index
+      // reader object is alive
+      block_cache_cleaner = this;
+    }
     return NewTwoLevelIterator(
-        new BlockBasedTable::BlockEntryIteratorState(table_, ReadOptions(),
-                                                     false),
-        index_block_->NewIterator(comparator_, iter, true));
+        new BlockBasedTable::BlockEntryIteratorState(
+            table_, ReadOptions(), skip_filters, is_index, block_cache_cleaner),
+        index_block_->NewIterator(comparator_, nullptr, true));
+    // TODO(myabandeh): Update TwoLevelIterator to be able to make use of
+    // on-stack
+    // BlockIter while the state is on heap
   }
 
   virtual size_t size() const override { return index_block_->size(); }
@@ -195,14 +213,17 @@ class PartitionIndexReader : public IndexReader {
 
  private:
   PartitionIndexReader(BlockBasedTable* table, const Comparator* comparator,
-                       std::unique_ptr<Block>&& index_block, Statistics* stats)
+                       std::unique_ptr<Block>&& index_block, Statistics* stats,
+                       const int level)
       : IndexReader(comparator, stats),
         table_(table),
-        index_block_(std::move(index_block)) {
+        index_block_(std::move(index_block)),
+        level_(level) {
     assert(index_block_ != nullptr);
   }
   BlockBasedTable* table_;
   std::unique_ptr<Block> index_block_;
+  int level_;
 };
 
 // Index that allows binary search lookup for the first key of each block.
@@ -555,14 +576,28 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
 
   // Find filter handle and filter type
   if (rep->filter_policy) {
-    for (auto prefix : {kFullFilterBlockPrefix, kFilterBlockPrefix}) {
+    for (auto filter_type :
+         {Rep::FilterType::kFullFilter, Rep::FilterType::kPartitionedFilter,
+          Rep::FilterType::kBlockFilter}) {
+      std::string prefix;
+      switch (filter_type) {
+        case Rep::FilterType::kFullFilter:
+          prefix = kFullFilterBlockPrefix;
+          break;
+        case Rep::FilterType::kPartitionedFilter:
+          prefix = kPartitionedFilterBlockPrefix;
+          break;
+        case Rep::FilterType::kBlockFilter:
+          prefix = kFilterBlockPrefix;
+          break;
+        default:
+          assert(0);
+      }
       std::string filter_block_key = prefix;
       filter_block_key.append(rep->filter_policy->Name());
       if (FindMetaBlock(meta_iter.get(), filter_block_key, &rep->filter_handle)
               .ok()) {
-        rep->filter_type = (prefix == kFullFilterBlockPrefix)
-                               ? Rep::FilterType::kFullFilter
-                               : Rep::FilterType::kBlockFilter;
+        rep->filter_type = filter_type;
         break;
       }
     }
@@ -697,6 +732,7 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
         if (rep->table_options.pin_l0_filter_and_index_blocks_in_cache &&
             level == 0) {
           rep->filter_entry = filter_entry;
+          rep->filter_entry.value->SetLevel(level);
         } else {
           filter_entry.Release(table_options.block_cache.get());
         }
@@ -707,14 +743,19 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
     // pre-load these blocks, which will kept in member variables in Rep
     // and with a same life-time as this table object.
     IndexReader* index_reader = nullptr;
-    s = new_table->CreateIndexReader(&index_reader, meta_iter.get());
+    s = new_table->CreateIndexReader(&index_reader, meta_iter.get(), level);
 
     if (s.ok()) {
       rep->index_reader.reset(index_reader);
 
       // Set filter block
       if (rep->filter_policy) {
-        rep->filter.reset(new_table->ReadFilter(rep));
+        const bool is_a_filter_partition = true;
+        rep->filter.reset(
+            new_table->ReadFilter(rep->filter_handle, !is_a_filter_partition));
+        if (rep->filter.get()) {
+          rep->filter->SetLevel(level);
+        }
       }
     } else {
       delete index_reader;
@@ -798,7 +839,8 @@ Status BlockBasedTable::GetDataBlockFromCache(
     Cache* block_cache, Cache* block_cache_compressed,
     const ImmutableCFOptions& ioptions, const ReadOptions& read_options,
     BlockBasedTable::CachableEntry<Block>* block, uint32_t format_version,
-    const Slice& compression_dict, size_t read_amp_bytes_per_bit) {
+    const Slice& compression_dict, size_t read_amp_bytes_per_bit,
+    bool is_index) {
   Status s;
   Block* compressed_block = nullptr;
   Cache::Handle* block_cache_compressed_handle = nullptr;
@@ -806,9 +848,10 @@ Status BlockBasedTable::GetDataBlockFromCache(
 
   // Lookup uncompressed cache first
   if (block_cache != nullptr) {
-    block->cache_handle =
-        GetEntryFromCache(block_cache, block_cache_key, BLOCK_CACHE_DATA_MISS,
-                          BLOCK_CACHE_DATA_HIT, statistics);
+    block->cache_handle = GetEntryFromCache(
+        block_cache, block_cache_key,
+        is_index ? BLOCK_CACHE_INDEX_MISS : BLOCK_CACHE_DATA_MISS,
+        is_index ? BLOCK_CACHE_INDEX_HIT : BLOCK_CACHE_DATA_HIT, statistics);
     if (block->cache_handle != nullptr) {
       block->value =
           reinterpret_cast<Block*>(block_cache->Value(block->cache_handle));
@@ -860,9 +903,15 @@ Status BlockBasedTable::GetDataBlockFromCache(
           &DeleteCachedEntry<Block>, &(block->cache_handle));
       if (s.ok()) {
         RecordTick(statistics, BLOCK_CACHE_ADD);
+        if (is_index) {
+          RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
+          RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT,
+                     block->value->usable_size());
+        } else {
           RecordTick(statistics, BLOCK_CACHE_DATA_ADD);
           RecordTick(statistics, BLOCK_CACHE_DATA_BYTES_INSERT,
                      block->value->usable_size());
+        }
         RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE,
                    block->value->usable_size());
       } else {
@@ -883,7 +932,8 @@ Status BlockBasedTable::PutDataBlockToCache(
     Cache* block_cache, Cache* block_cache_compressed,
     const ReadOptions& read_options, const ImmutableCFOptions& ioptions,
     CachableEntry<Block>* block, Block* raw_block, uint32_t format_version,
-    const Slice& compression_dict, size_t read_amp_bytes_per_bit) {
+    const Slice& compression_dict, size_t read_amp_bytes_per_bit, bool is_index,
+    Cache::Priority priority) {
   assert(raw_block->compression_type() == kNoCompression ||
          block_cache_compressed != nullptr);
 
@@ -929,15 +979,21 @@ Status BlockBasedTable::PutDataBlockToCache(
   // insert into uncompressed block cache
   assert((block->value->compression_type() == kNoCompression));
   if (block_cache != nullptr && block->value->cachable()) {
-    s = block_cache->Insert(block_cache_key, block->value,
-                            block->value->usable_size(),
-                            &DeleteCachedEntry<Block>, &(block->cache_handle));
+    s = block_cache->Insert(
+        block_cache_key, block->value, block->value->usable_size(),
+        &DeleteCachedEntry<Block>, &(block->cache_handle), priority);
     if (s.ok()) {
       assert(block->cache_handle != nullptr);
       RecordTick(statistics, BLOCK_CACHE_ADD);
+      if (is_index) {
+        RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
+        RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT,
+                   block->value->usable_size());
+      } else {
         RecordTick(statistics, BLOCK_CACHE_DATA_ADD);
         RecordTick(statistics, BLOCK_CACHE_DATA_BYTES_INSERT,
                    block->value->usable_size());
+      }
       RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE,
                  block->value->usable_size());
       assert(reinterpret_cast<Block*>(
@@ -952,7 +1008,9 @@ Status BlockBasedTable::PutDataBlockToCache(
   return s;
 }
 
-FilterBlockReader* BlockBasedTable::ReadFilter(Rep* rep) const {
+FilterBlockReader* BlockBasedTable::ReadFilter(
+    const BlockHandle& filter_handle, const bool is_a_filter_partition) const {
+  auto& rep = rep_;
   // TODO: We might want to unify with ReadBlockFromFile() if we start
   // requiring checksum verification in Table::Open.
   if (rep->filter_type == Rep::FilterType::kNoFilter) {
@@ -960,7 +1018,7 @@ FilterBlockReader* BlockBasedTable::ReadFilter(Rep* rep) const {
   }
   BlockContents block;
   if (!ReadBlockContents(rep->file.get(), rep->footer, ReadOptions(),
-                         rep->filter_handle, &block, rep->ioptions,
+                         filter_handle, &block, rep->ioptions,
                          false /* decompress */, Slice() /*compression dict*/,
                          rep->persistent_cache_options)
            .ok()) {
@@ -970,35 +1028,60 @@ FilterBlockReader* BlockBasedTable::ReadFilter(Rep* rep) const {
 
   assert(rep->filter_policy);
 
-  if (rep->filter_type == Rep::FilterType::kBlockFilter) {
+  auto filter_type = rep->filter_type;
+  if (rep->filter_type == Rep::FilterType::kPartitionedFilter &&
+      is_a_filter_partition) {
+    filter_type = Rep::FilterType::kFullFilter;
+  }
+
+  switch (filter_type) {
+    case Rep::FilterType::kPartitionedFilter: {
+      return new PartitionedFilterBlockReader(
+          rep->prefix_filtering ? rep->ioptions.prefix_extractor : nullptr,
+          rep->whole_key_filtering, std::move(block), nullptr,
+          rep->ioptions.statistics, rep->internal_comparator, this);
+    }
+
+    case Rep::FilterType::kBlockFilter:
       return new BlockBasedFilterBlockReader(
           rep->prefix_filtering ? rep->ioptions.prefix_extractor : nullptr,
           rep->table_options, rep->whole_key_filtering, std::move(block),
           rep->ioptions.statistics);
-  } else if (rep->filter_type == Rep::FilterType::kFullFilter) {
+
+    case Rep::FilterType::kFullFilter: {
       auto filter_bits_reader =
           rep->filter_policy->GetFilterBitsReader(block.data);
-    if (filter_bits_reader != nullptr) {
+      assert(filter_bits_reader != nullptr);
       return new FullFilterBlockReader(
           rep->prefix_filtering ? rep->ioptions.prefix_extractor : nullptr,
           rep->whole_key_filtering, std::move(block), filter_bits_reader,
           rep->ioptions.statistics);
     }
-  }
 
+    default:
       // filter_type is either kNoFilter (exited the function at the first if),
-  // kBlockFilter or kFullFilter. there is no way for the execution to come here
+      // or it must be covered in this switch block
       assert(false);
       return nullptr;
   }
+}
+
+BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
+                                                          bool no_io) const {
+  const BlockHandle& filter_blk_handle = rep_->filter_handle;
+  const bool is_a_filter_partition = true;
+  return GetFilter(filter_blk_handle, !is_a_filter_partition, no_io);
+}
 
 BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
+    const BlockHandle& filter_blk_handle, const bool is_a_filter_partition,
     bool no_io) const {
   // If cache_index_and_filter_blocks is false, filter should be pre-populated.
   // We will return rep_->filter anyway. rep_->filter can be nullptr if filter
   // read fails at Open() time. We don't want to reload again since it will
   // most probably fail again.
-  if (!rep_->table_options.cache_index_and_filter_blocks) {
+  if (!is_a_filter_partition &&
+      !rep_->table_options.cache_index_and_filter_blocks) {
     return {rep_->filter.get(), nullptr /* cache handle */};
   }
 
@@ -1008,8 +1091,7 @@ BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
     return {nullptr /* filter */, nullptr /* cache handle */};
   }
 
-  // we have a pinned filter block
-  if (rep_->filter_entry.IsSet()) {
+  if (!is_a_filter_partition && rep_->filter_entry.IsSet()) {
     return rep_->filter_entry;
   }
 
@@ -1018,8 +1100,7 @@ BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
   // Fetching from the cache
   char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
   auto key = GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size,
-                         rep_->footer.metaindex_handle(),
-                         cache_key);
+                         filter_blk_handle, cache_key);
 
   Statistics* statistics = rep_->ioptions.statistics;
   auto cache_handle =
@@ -1034,7 +1115,7 @@ BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
     // Do not invoke any io.
     return CachableEntry<FilterBlockReader>();
   } else {
-    filter = ReadFilter(rep_);
+    filter = ReadFilter(filter_blk_handle, is_a_filter_partition);
     if (filter != nullptr) {
       assert(filter->size() > 0);
       Status s = block_cache->Insert(
@@ -1074,7 +1155,7 @@ InternalIterator* BlockBasedTable::NewIndexIterator(
 
   PERF_TIMER_GUARD(read_index_block_nanos);
 
-  bool no_io = read_options.read_tier == kBlockCacheTier;
+  const bool no_io = read_options.read_tier == kBlockCacheTier;
   Cache* block_cache = rep_->table_options.block_cache.get();
   char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
   auto key =
@@ -1153,29 +1234,36 @@ InternalIterator* BlockBasedTable::NewIndexIterator(
   return iter;
 }
 
+InternalIterator* BlockBasedTable::NewDataBlockIterator(
+    Rep* rep, const ReadOptions& ro, const Slice& index_value,
+    BlockIter* input_iter, bool is_index) {
+  BlockHandle handle;
+  Slice input = index_value;
+  // We intentionally allow extra stuff in index_value so that we
+  // can add more features in the future.
+  Status s = handle.DecodeFrom(&input);
+  return NewDataBlockIterator(rep, ro, handle, input_iter, is_index, s);
+}
+
 // Convert an index iterator value (i.e., an encoded BlockHandle)
 // into an iterator over the contents of the corresponding block.
 // If input_iter is null, new a iterator
 // If input_iter is not null, update this iter and return it
 InternalIterator* BlockBasedTable::NewDataBlockIterator(
-    Rep* rep, const ReadOptions& ro, const Slice& index_value,
-    BlockIter* input_iter) {
+    Rep* rep, const ReadOptions& ro, const BlockHandle& handle,
+    BlockIter* input_iter, bool is_index, Status s) {
   PERF_TIMER_GUARD(new_table_block_iter_nanos);
 
   const bool no_io = (ro.read_tier == kBlockCacheTier);
   Cache* block_cache = rep->table_options.block_cache.get();
   CachableEntry<Block> block;
-  BlockHandle handle;
-  Slice input = index_value;
-  // We intentionally allow extra stuff in index_value so that we
-  // can add more features in the future.
-  Status s = handle.DecodeFrom(&input);
   Slice compression_dict;
   if (s.ok()) {
     if (rep->compression_dict_block) {
       compression_dict = rep->compression_dict_block->data;
     }
-    s = MaybeLoadDataBlockToCache(rep, ro, handle, compression_dict, &block);
+    s = MaybeLoadDataBlockToCache(rep, ro, handle, compression_dict, &block,
+                                  is_index);
   }
 
   // Didn't get any data from block caches.
@@ -1224,7 +1312,7 @@ InternalIterator* BlockBasedTable::NewDataBlockIterator(
 
 Status BlockBasedTable::MaybeLoadDataBlockToCache(
     Rep* rep, const ReadOptions& ro, const BlockHandle& handle,
-    Slice compression_dict, CachableEntry<Block>* block_entry) {
+    Slice compression_dict, CachableEntry<Block>* block_entry, bool is_index) {
   const bool no_io = (ro.read_tier == kBlockCacheTier);
   Cache* block_cache = rep->table_options.block_cache.get();
   Cache* block_cache_compressed =
@@ -1254,7 +1342,7 @@ Status BlockBasedTable::MaybeLoadDataBlockToCache(
     s = GetDataBlockFromCache(
         key, ckey, block_cache, block_cache_compressed, rep->ioptions, ro,
         block_entry, rep->table_options.format_version, compression_dict,
-        rep->table_options.read_amp_bytes_per_bit);
+        rep->table_options.read_amp_bytes_per_bit, is_index);
 
     if (block_entry->value == nullptr && !no_io && ro.fill_cache) {
       std::unique_ptr<Block> raw_block;
@@ -1271,7 +1359,13 @@ Status BlockBasedTable::MaybeLoadDataBlockToCache(
         s = PutDataBlockToCache(
             key, ckey, block_cache, block_cache_compressed, ro, rep->ioptions,
             block_entry, raw_block.release(), rep->table_options.format_version,
-            compression_dict, rep->table_options.read_amp_bytes_per_bit);
+            compression_dict, rep->table_options.read_amp_bytes_per_bit,
+            is_index,
+            is_index &&
+                    rep->table_options
+                        .cache_index_and_filter_blocks_with_high_priority
+                ? Cache::Priority::HIGH
+                : Cache::Priority::LOW);
       }
     }
   }
@@ -1279,17 +1373,39 @@ Status BlockBasedTable::MaybeLoadDataBlockToCache(
 }
 
 BlockBasedTable::BlockEntryIteratorState::BlockEntryIteratorState(
-    BlockBasedTable* table, const ReadOptions& read_options, bool skip_filters)
+    BlockBasedTable* table, const ReadOptions& read_options, bool skip_filters,
+    bool is_index, Cleanable* block_cache_cleaner)
     : TwoLevelIteratorState(table->rep_->ioptions.prefix_extractor != nullptr),
       table_(table),
       read_options_(read_options),
-      skip_filters_(skip_filters) {}
+      skip_filters_(skip_filters),
+      is_index_(is_index),
+      block_cache_cleaner_(block_cache_cleaner) {}
 
 InternalIterator*
 BlockBasedTable::BlockEntryIteratorState::NewSecondaryIterator(
     const Slice& index_value) {
   // Return a block iterator on the index partition
-  return NewDataBlockIterator(table_->rep_, read_options_, index_value);
+  BlockHandle handle;
+  Slice input = index_value;
+  Status s = handle.DecodeFrom(&input);
+  auto iter = NewDataBlockIterator(table_->rep_, read_options_, handle, nullptr,
+                                   is_index_, s);
+  if (block_cache_cleaner_) {
+    uint64_t offset = handle.offset();
+    {
+      ReadLock rl(&cleaner_mu);
+      if (cleaner_set.find(offset) != cleaner_set.end()) {
+        // already have a refernce to the block cache objects
+        return iter;
+      }
+    }
+    WriteLock wl(&cleaner_mu);
+    cleaner_set.insert(offset);
+    // Keep the data into cache until the cleaner cleansup
+    iter->DelegateCleanupsTo(block_cache_cleaner_);
+  }
+  return iter;
 }
 
 bool BlockBasedTable::BlockEntryIteratorState::PrefixMayMatch(
@@ -1325,25 +1441,29 @@ bool BlockBasedTable::PrefixMayMatch(const Slice& internal_key) {
     return true;
   }
   auto prefix = rep_->ioptions.prefix_extractor->Transform(user_key);
-  InternalKey internal_key_prefix(prefix, kMaxSequenceNumber, kTypeValue);
-  auto internal_prefix = internal_key_prefix.Encode();
 
   bool may_match = true;
   Status s;
 
+  // First, try check with full filter
+  const bool no_io = true;
+  auto filter_entry = GetFilter(no_io);
+  FilterBlockReader* filter = filter_entry.value;
+  if (filter != nullptr) {
+    if (!filter->IsBlockBased()) {
+      const Slice* const const_ikey_ptr = &internal_key;
+      may_match =
+          filter->PrefixMayMatch(prefix, kNotValid, no_io, const_ikey_ptr);
+    } else {
+      InternalKey internal_key_prefix(prefix, kMaxSequenceNumber, kTypeValue);
+      auto internal_prefix = internal_key_prefix.Encode();
+
       // To prevent any io operation in this method, we set `read_tier` to make
       // sure we always read index or filter only when they have already been
       // loaded to memory.
       ReadOptions no_io_read_options;
       no_io_read_options.read_tier = kBlockCacheTier;
 
-  // First, try check with full filter
-  auto filter_entry = GetFilter(true /* no io */);
-  FilterBlockReader* filter = filter_entry.value;
-  if (filter != nullptr) {
-    if (!filter->IsBlockBased()) {
-      may_match = filter->PrefixMayMatch(prefix);
-    } else {
       // Then, try find it within each block
       unique_ptr<InternalIterator> iiter(NewIndexIterator(no_io_read_options));
       iiter->Seek(internal_prefix);
@@ -1438,20 +1558,23 @@ InternalIterator* BlockBasedTable::NewRangeTombstoneIterator(
 
 bool BlockBasedTable::FullFilterKeyMayMatch(const ReadOptions& read_options,
                                             FilterBlockReader* filter,
-                                            const Slice& internal_key) const {
+                                            const Slice& internal_key,
+                                            const bool no_io) const {
   if (filter == nullptr || filter->IsBlockBased()) {
     return true;
   }
   Slice user_key = ExtractUserKey(internal_key);
+  const Slice* const const_ikey_ptr = &internal_key;
   if (filter->whole_key_filtering()) {
-    return filter->KeyMayMatch(user_key);
+    return filter->KeyMayMatch(user_key, kNotValid, no_io, const_ikey_ptr);
   }
   if (!read_options.total_order_seek && rep_->ioptions.prefix_extractor &&
       rep_->table_properties->prefix_extractor_name.compare(
           rep_->ioptions.prefix_extractor->Name()) == 0 &&
       rep_->ioptions.prefix_extractor->InDomain(user_key) &&
       !filter->PrefixMayMatch(
-          rep_->ioptions.prefix_extractor->Transform(user_key))) {
+          rep_->ioptions.prefix_extractor->Transform(user_key), kNotValid,
+          false, const_ikey_ptr)) {
     return false;
   }
   return true;
@@ -1460,6 +1583,7 @@ bool BlockBasedTable::FullFilterKeyMayMatch(const ReadOptions& read_options,
 Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
                             GetContext* get_context, bool skip_filters) {
   Status s;
+  const bool no_io = read_options.read_tier == kBlockCacheTier;
   CachableEntry<FilterBlockReader> filter_entry;
   if (!skip_filters) {
     filter_entry = GetFilter(read_options.read_tier == kBlockCacheTier);
@@ -1468,14 +1592,14 @@ Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
 
   // First check the full filter
   // If full filter not useful, Then go into each block
-  if (!FullFilterKeyMayMatch(read_options, filter, key)) {
+  if (!FullFilterKeyMayMatch(read_options, filter, key, no_io)) {
     RecordTick(rep_->ioptions.statistics, BLOOM_FILTER_USEFUL);
   } else {
     BlockIter iiter_on_stack;
     auto iiter = NewIndexIterator(read_options, &iiter_on_stack);
     std::unique_ptr<InternalIterator> iiter_unique_ptr;
     if (iiter != &iiter_on_stack) {
-      iiter_unique_ptr = std::unique_ptr<InternalIterator>(iiter);
+      iiter_unique_ptr.reset(iiter);
     }
 
     bool done = false;
@@ -1486,7 +1610,7 @@ Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
       bool not_exist_in_filter =
           filter != nullptr && filter->IsBlockBased() == true &&
           handle.DecodeFrom(&handle_value).ok() &&
-          !filter->KeyMayMatch(ExtractUserKey(key), handle.offset());
+          !filter->KeyMayMatch(ExtractUserKey(key), handle.offset(), no_io);
 
       if (not_exist_in_filter) {
         // Not found
@@ -1525,6 +1649,10 @@ Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
         }
         s = biter.status();
       }
+      if (done) {
+        // Avoid the extra Next which is expensive in two-level indexes
+        break;
+      }
     }
     if (s.ok()) {
       s = iiter->status();
@@ -1631,7 +1759,8 @@ bool BlockBasedTable::TEST_KeyInCache(const ReadOptions& options,
 //  4. internal_comparator
 //  5. index_type
 Status BlockBasedTable::CreateIndexReader(
-    IndexReader** index_reader, InternalIterator* preloaded_meta_index_iter) {
+    IndexReader** index_reader, InternalIterator* preloaded_meta_index_iter,
+    int level) {
   // Some old version of block-based tables don't have index type present in
   // table properties. If that's the case we can safely use the kBinarySearch.
   auto index_type_on_file = BlockBasedTableOptions::kBinarySearch;
@@ -1660,7 +1789,7 @@ Status BlockBasedTable::CreateIndexReader(
     case BlockBasedTableOptions::kTwoLevelIndexSearch: {
       return PartitionIndexReader::Create(
           this, file, footer, footer.index_handle(), rep_->ioptions, comparator,
-          index_reader, rep_->persistent_cache_options);
+          index_reader, rep_->persistent_cache_options, level);
     }
     case BlockBasedTableOptions::kBinarySearch: {
       return BinarySearchIndexReader::Create(

table/block_based_table_reader.h

@@ -11,6 +11,7 @@
 
 #include <stdint.h>
 #include <memory>
+#include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ -193,17 +194,29 @@ class BlockBasedTable : public TableReader {
 
   class BlockEntryIteratorState;
 
- private:
+  friend class PartitionIndexReader;
+
+ protected:
   template <class TValue>
   struct CachableEntry;
   struct Rep;
   Rep* rep_;
+  explicit BlockBasedTable(Rep* rep)
+      : rep_(rep), compaction_optimized_(false) {}
+
+ private:
   bool compaction_optimized_;
 
   // input_iter: if it is not null, update this one and return it as Iterator
-  static InternalIterator* NewDataBlockIterator(
-      Rep* rep, const ReadOptions& ro, const Slice& index_value,
-      BlockIter* input_iter = nullptr);
+  static InternalIterator* NewDataBlockIterator(Rep* rep, const ReadOptions& ro,
+                                                const Slice& index_value,
+                                                BlockIter* input_iter = nullptr,
+                                                bool is_index = false);
+  static InternalIterator* NewDataBlockIterator(Rep* rep, const ReadOptions& ro,
+                                                const BlockHandle& block_hanlde,
+                                                BlockIter* input_iter = nullptr,
+                                                bool is_index = false,
+                                                Status s = Status());
   // If block cache enabled (compressed or uncompressed), looks for the block
   // identified by handle in (1) uncompressed cache, (2) compressed cache, and
   // then (3) file. If found, inserts into the cache(s) that were searched
@@ -213,14 +226,19 @@ class BlockBasedTable : public TableReader {
   // @param block_entry value is set to the uncompressed block if found. If
   //    in uncompressed block cache, also sets cache_handle to reference that
   //    block.
-  static Status MaybeLoadDataBlockToCache(
-      Rep* rep, const ReadOptions& ro, const BlockHandle& handle,
-      Slice compression_dict, CachableEntry<Block>* block_entry);
+  static Status MaybeLoadDataBlockToCache(Rep* rep, const ReadOptions& ro,
+                                          const BlockHandle& handle,
+                                          Slice compression_dict,
+                                          CachableEntry<Block>* block_entry,
+                                          bool is_index = false);
 
   // For the following two functions:
   // if `no_io == true`, we will not try to read filter/index from sst file
   // were they not present in cache yet.
   CachableEntry<FilterBlockReader> GetFilter(bool no_io = false) const;
+  virtual CachableEntry<FilterBlockReader> GetFilter(
+      const BlockHandle& filter_blk_handle, const bool is_a_filter_partition,
+      bool no_io) const;
 
   // Get the iterator from the index reader.
   // If input_iter is not set, return new Iterator
@@ -247,7 +265,8 @@ class BlockBasedTable : public TableReader {
       Cache* block_cache, Cache* block_cache_compressed,
       const ImmutableCFOptions& ioptions, const ReadOptions& read_options,
       BlockBasedTable::CachableEntry<Block>* block, uint32_t format_version,
-      const Slice& compression_dict, size_t read_amp_bytes_per_bit);
+      const Slice& compression_dict, size_t read_amp_bytes_per_bit,
+      bool is_index = false);
 
   // Put a raw block (maybe compressed) to the corresponding block caches.
   // This method will perform decompression against raw_block if needed and then
@@ -264,7 +283,8 @@ class BlockBasedTable : public TableReader {
       Cache* block_cache, Cache* block_cache_compressed,
       const ReadOptions& read_options, const ImmutableCFOptions& ioptions,
       CachableEntry<Block>* block, Block* raw_block, uint32_t format_version,
-      const Slice& compression_dict, size_t read_amp_bytes_per_bit);
+      const Slice& compression_dict, size_t read_amp_bytes_per_bit,
+      bool is_index = false, Cache::Priority pri = Cache::Priority::LOW);
 
   // Calls (*handle_result)(arg, ...) repeatedly, starting with the entry found
   // after a call to Seek(key), until handle_result returns false.
@@ -280,24 +300,23 @@ class BlockBasedTable : public TableReader {
   // helps avoid re-reading meta index block if caller already created one.
   Status CreateIndexReader(
       IndexReader** index_reader,
-      InternalIterator* preloaded_meta_index_iter = nullptr);
+      InternalIterator* preloaded_meta_index_iter = nullptr,
+      const int level = -1);
 
   bool FullFilterKeyMayMatch(const ReadOptions& read_options,
-                             FilterBlockReader* filter,
-                             const Slice& user_key) const;
+                             FilterBlockReader* filter, const Slice& user_key,
+                             const bool no_io) const;
 
   // Read the meta block from sst.
   static Status ReadMetaBlock(Rep* rep, std::unique_ptr<Block>* meta_block,
                               std::unique_ptr<InternalIterator>* iter);
 
   // Create the filter from the filter block.
-  FilterBlockReader* ReadFilter(Rep* rep) const;
+  FilterBlockReader* ReadFilter(const BlockHandle& filter_handle,
+                                const bool is_a_filter_partition) const;
 
   static void SetupCacheKeyPrefix(Rep* rep, uint64_t file_size);
 
-  explicit BlockBasedTable(Rep* rep)
-      : rep_(rep), compaction_optimized_(false) {}
-
   // Generate a cache key prefix from the file
   static void GenerateCachePrefix(Cache* cc,
     RandomAccessFile* file, char* buffer, size_t* size);
@@ -313,13 +332,18 @@ class BlockBasedTable : public TableReader {
   // No copying allowed
   explicit BlockBasedTable(const TableReader&) = delete;
   void operator=(const TableReader&) = delete;
+
+  friend class PartitionedFilterBlockReader;
+  friend class PartitionedFilterBlockTest;
 };
 
 // Maitaning state of a two-level iteration on a partitioned index structure
 class BlockBasedTable::BlockEntryIteratorState : public TwoLevelIteratorState {
  public:
   BlockEntryIteratorState(BlockBasedTable* table,
-                          const ReadOptions& read_options, bool skip_filters);
+                          const ReadOptions& read_options, bool skip_filters,
+                          bool is_index = false,
+                          Cleanable* block_cache_cleaner = nullptr);
   InternalIterator* NewSecondaryIterator(const Slice& index_value) override;
   bool PrefixMayMatch(const Slice& internal_key) override;
 
@@ -328,6 +352,11 @@ class BlockBasedTable::BlockEntryIteratorState : public TwoLevelIteratorState {
   BlockBasedTable* table_;
   const ReadOptions read_options_;
   bool skip_filters_;
+  // true if the 2nd level iterator is on indexes instead of on user data.
+  bool is_index_;
+  Cleanable* block_cache_cleaner_;
+  std::set<uint64_t> cleaner_set;
+  port::RWMutex cleaner_mu;
 };
 
 // CachableEntry represents the entries that *may* be fetched from block cache.

table/filter_block.h

@@ -82,16 +82,35 @@ class FilterBlockReader {
   virtual ~FilterBlockReader() {}
 
   virtual bool IsBlockBased() = 0;  // If is blockbased filter
-  virtual bool KeyMayMatch(const Slice& key,
-                           uint64_t block_offset = kNotValid) = 0;
+  /**
+   * If no_io is set, then it returns true if it cannot answer the query without
+   * reading data from disk. This is used in PartitionedFilterBlockReader to
+   * avoid reading partitions that are not in block cache already
+   *
+   * Normally filters are built on only the user keys and the InternalKey is not
+   * needed for a query. The index in PartitionedFilterBlockReader however is
+   * built upon InternalKey and must be provided via const_ikey_ptr when running
+   * queries.
+   */
+  virtual bool KeyMayMatch(const Slice& key, uint64_t block_offset = kNotValid,
+                           const bool no_io = false,
+                           const Slice* const const_ikey_ptr = nullptr) = 0;
+  /**
+   * no_io and const_ikey_ptr here means the same as in KeyMayMatch
+   */
   virtual bool PrefixMayMatch(const Slice& prefix,
-                              uint64_t block_offset = kNotValid) = 0;
+                              uint64_t block_offset = kNotValid,
+                              const bool no_io = false,
+                              const Slice* const const_ikey_ptr = nullptr) = 0;
   virtual size_t ApproximateMemoryUsage() const = 0;
   virtual size_t size() const { return size_; }
   virtual Statistics* statistics() const { return statistics_; }
 
   bool whole_key_filtering() const { return whole_key_filtering_; }
 
+  int GetLevel() const { return level_; }
+  void SetLevel(int level) { level_ = level; }
+
   // convert this object to a human readable form
   virtual std::string ToString() const {
     std::string error_msg("Unsupported filter \n");
@@ -107,6 +126,7 @@ class FilterBlockReader {
   void operator=(const FilterBlockReader&);
   size_t size_;
   Statistics* statistics_;
+  int level_ = -1;
 };
 
 }  // namespace rocksdb

table/full_filter_block.cc

@@ -73,8 +73,9 @@ FullFilterBlockReader::FullFilterBlockReader(
   block_contents_ = std::move(contents);
 }
 
-bool FullFilterBlockReader::KeyMayMatch(const Slice& key,
-                                        uint64_t block_offset) {
+bool FullFilterBlockReader::KeyMayMatch(const Slice& key, uint64_t block_offset,
+                                        const bool no_io,
+                                        const Slice* const const_ikey_ptr) {
   assert(block_offset == kNotValid);
   if (!whole_key_filtering_) {
     return true;
@@ -83,7 +84,9 @@ bool FullFilterBlockReader::KeyMayMatch(const Slice& key,
 }
 
 bool FullFilterBlockReader::PrefixMayMatch(const Slice& prefix,
-                                           uint64_t block_offset) {
+                                           uint64_t block_offset,
+                                           const bool no_io,
+                                           const Slice* const const_ikey_ptr) {
   assert(block_offset == kNotValid);
   if (!prefix_extractor_) {
     return true;

table/full_filter_block.h

@@ -91,10 +91,14 @@ class FullFilterBlockReader : public FilterBlockReader {
   ~FullFilterBlockReader() {}
 
   virtual bool IsBlockBased() override { return false; }
-  virtual bool KeyMayMatch(const Slice& key,
-                           uint64_t block_offset = kNotValid) override;
-  virtual bool PrefixMayMatch(const Slice& prefix,
-                              uint64_t block_offset = kNotValid) override;
+  virtual bool KeyMayMatch(
+      const Slice& key, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
+  virtual bool PrefixMayMatch(
+      const Slice& prefix, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
   virtual size_t ApproximateMemoryUsage() const override;
 
  private:

table/partitioned_filter_block.cc

@@ -5,7 +5,12 @@
 
 #include "table/partitioned_filter_block.h"
 
+#include <utility>
+
 #include "port/port.h"
+#include "rocksdb/filter_policy.h"
+#include "table/block.h"
+#include "table/block_based_table_reader.h"
 #include "util/coding.h"
 
 namespace rocksdb {
@@ -67,4 +72,149 @@ Slice PartitionedFilterBlockBuilder::Finish(
   }
 }
 
+PartitionedFilterBlockReader::PartitionedFilterBlockReader(
+    const SliceTransform* prefix_extractor, bool _whole_key_filtering,
+    BlockContents&& contents, FilterBitsReader* filter_bits_reader,
+    Statistics* stats, const Comparator& comparator,
+    const BlockBasedTable* table)
+    : FilterBlockReader(contents.data.size(), stats, _whole_key_filtering),
+      prefix_extractor_(prefix_extractor),
+      comparator_(comparator),
+      table_(table) {
+  idx_on_fltr_blk_.reset(new Block(std::move(contents),
+                                   kDisableGlobalSequenceNumber,
+                                   0 /* read_amp_bytes_per_bit */, stats));
+}
+
+PartitionedFilterBlockReader::~PartitionedFilterBlockReader() {
+  ReadLock rl(&mu_);
+  for (auto it = handle_list_.begin(); it != handle_list_.end(); ++it) {
+    table_->rep_->table_options.block_cache.get()->Release(*it);
+  }
+}
+
+bool PartitionedFilterBlockReader::KeyMayMatch(
+    const Slice& key, uint64_t block_offset, const bool no_io,
+    const Slice* const const_ikey_ptr) {
+  assert(const_ikey_ptr != nullptr);
+  assert(block_offset == kNotValid);
+  if (!whole_key_filtering_) {
+    return true;
+  }
+  if (UNLIKELY(idx_on_fltr_blk_->size() == 0)) {
+    return true;
+  }
+  // This is the user key vs. the full key in the partition index. We assume
+  // that user key <= full key
+  auto filter_handle = GetFilterPartitionHandle(*const_ikey_ptr);
+  if (UNLIKELY(filter_handle.size() == 0)) {  // key is out of range
+    return false;
+  }
+  bool cached = false;
+  auto filter_partition = GetFilterPartition(&filter_handle, no_io, &cached);
+  if (UNLIKELY(!filter_partition.value)) {
+    return true;
+  }
+  auto res = filter_partition.value->KeyMayMatch(key, block_offset, no_io);
+  if (cached) {
+    return res;
+  }
+  if (LIKELY(filter_partition.IsSet())) {
+    filter_partition.Release(table_->rep_->table_options.block_cache.get());
+  } else {
+    delete filter_partition.value;
+  }
+  return res;
+}
+
+bool PartitionedFilterBlockReader::PrefixMayMatch(
+    const Slice& prefix, uint64_t block_offset, const bool no_io,
+    const Slice* const const_ikey_ptr) {
+  assert(const_ikey_ptr != nullptr);
+  assert(block_offset == kNotValid);
+  if (!prefix_extractor_) {
+    return true;
+  }
+  if (UNLIKELY(idx_on_fltr_blk_->size() == 0)) {
+    return true;
+  }
+  auto filter_handle = GetFilterPartitionHandle(*const_ikey_ptr);
+  if (UNLIKELY(filter_handle.size() == 0)) {  // prefix is out of range
+    return false;
+  }
+  bool cached = false;
+  auto filter_partition = GetFilterPartition(&filter_handle, no_io, &cached);
+  if (UNLIKELY(!filter_partition.value)) {
+    return true;
+  }
+  auto res = filter_partition.value->PrefixMayMatch(prefix, kNotValid, no_io);
+  if (cached) {
+    return res;
+  }
+  if (LIKELY(filter_partition.IsSet())) {
+    filter_partition.Release(table_->rep_->table_options.block_cache.get());
+  } else {
+    delete filter_partition.value;
+  }
+  return res;
+}
+
+Slice PartitionedFilterBlockReader::GetFilterPartitionHandle(
+    const Slice& entry) {
+  BlockIter iter;
+  idx_on_fltr_blk_->NewIterator(&comparator_, &iter, true);
+  iter.Seek(entry);
+  if (UNLIKELY(!iter.Valid())) {
+    return Slice();
+  }
+  assert(iter.Valid());
+  Slice handle_value = iter.value();
+  return handle_value;
+}
+
+BlockBasedTable::CachableEntry<FilterBlockReader>
+PartitionedFilterBlockReader::GetFilterPartition(Slice* handle_value,
+                                                 const bool no_io,
+                                                 bool* cached) {
+  BlockHandle fltr_blk_handle;
+  auto s = fltr_blk_handle.DecodeFrom(handle_value);
+  assert(s.ok());
+  const bool is_a_filter_partition = true;
+  auto block_cache = table_->rep_->table_options.block_cache.get();
+  if (LIKELY(block_cache != nullptr)) {
+    bool pin_cached_filters =
+        GetLevel() == 0 &&
+        table_->rep_->table_options.pin_l0_filter_and_index_blocks_in_cache;
+    if (pin_cached_filters) {
+      ReadLock rl(&mu_);
+      auto iter = filter_cache_.find(fltr_blk_handle.offset());
+      if (iter != filter_cache_.end()) {
+        RecordTick(statistics(), BLOCK_CACHE_FILTER_HIT);
+        *cached = true;
+        return {iter->second, nullptr};
+      }
+    }
+    auto filter =
+        table_->GetFilter(fltr_blk_handle, is_a_filter_partition, no_io);
+    if (pin_cached_filters && filter.IsSet()) {
+      WriteLock wl(&mu_);
+      std::pair<uint64_t, FilterBlockReader*> pair(fltr_blk_handle.offset(),
+                                                   filter.value);
+      auto succ = filter_cache_.insert(pair).second;
+      if (succ) {
+        handle_list_.push_back(filter.cache_handle);
+      }  // Otherwise it is already inserted by a concurrent thread
+      *cached = true;
+    }
+    return filter;
+  } else {
+    auto filter = table_->ReadFilter(fltr_blk_handle, is_a_filter_partition);
+    return {filter, nullptr};
+  }
+}
+
+size_t PartitionedFilterBlockReader::ApproximateMemoryUsage() const {
+  return idx_on_fltr_blk_->size();
+}
+
 }  // namespace rocksdb

table/partitioned_filter_block.h

@@ -7,14 +7,17 @@
 
 #include <list>
 #include <string>
-#include <vector>
+#include <unordered_map>
 #include "db/dbformat.h"
 #include "rocksdb/options.h"
 #include "rocksdb/slice.h"
 #include "rocksdb/slice_transform.h"
 
+#include "table/block.h"
+#include "table/block_based_table_reader.h"
 #include "table/full_filter_block.h"
 #include "table/index_builder.h"
+#include "util/autovector.h"
 
 namespace rocksdb {
 
@@ -49,4 +52,40 @@ class PartitionedFilterBlockBuilder : public FullFilterBlockBuilder {
   PartitionedIndexBuilder* const p_index_builder_;
 };
 
+class PartitionedFilterBlockReader : public FilterBlockReader {
+ public:
+  explicit PartitionedFilterBlockReader(const SliceTransform* prefix_extractor,
+                                        bool whole_key_filtering,
+                                        BlockContents&& contents,
+                                        FilterBitsReader* filter_bits_reader,
+                                        Statistics* stats,
+                                        const Comparator& comparator,
+                                        const BlockBasedTable* table);
+  virtual ~PartitionedFilterBlockReader();
+
+  virtual bool IsBlockBased() override { return false; }
+  virtual bool KeyMayMatch(
+      const Slice& key, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
+  virtual bool PrefixMayMatch(
+      const Slice& prefix, uint64_t block_offset = kNotValid,
+      const bool no_io = false,
+      const Slice* const const_ikey_ptr = nullptr) override;
+  virtual size_t ApproximateMemoryUsage() const override;
+
+ private:
+  Slice GetFilterPartitionHandle(const Slice& entry);
+  BlockBasedTable::CachableEntry<FilterBlockReader> GetFilterPartition(
+      Slice* handle, const bool no_io, bool* cached);
+
+  const SliceTransform* prefix_extractor_;
+  std::unique_ptr<Block> idx_on_fltr_blk_;
+  const Comparator& comparator_;
+  const BlockBasedTable* table_;
+  std::unordered_map<uint64_t, FilterBlockReader*> filter_cache_;
+  autovector<Cache::Handle*> handle_list_;
+  port::RWMutex mu_;
+};
+
 }  // namespace rocksdb

table/partitioned_filter_block_test.cc

@@ -0,0 +1,242 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  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.
+
+#include <map>
+
+#include "rocksdb/filter_policy.h"
+
+#include "table/partitioned_filter_block.h"
+#include "util/coding.h"
+#include "util/hash.h"
+#include "util/logging.h"
+#include "util/testharness.h"
+#include "util/testutil.h"
+
+namespace rocksdb {
+
+std::map<uint64_t, Slice> slices;
+
+class MockedBlockBasedTable : public BlockBasedTable {
+ public:
+  explicit MockedBlockBasedTable(Rep* rep) : BlockBasedTable(rep) {}
+
+  virtual CachableEntry<FilterBlockReader> GetFilter(
+      const BlockHandle& filter_blk_handle, const bool is_a_filter_partition,
+      bool no_io) const override {
+    Slice slice = slices[filter_blk_handle.offset()];
+    auto obj = new FullFilterBlockReader(
+        nullptr, true, BlockContents(slice, false, kNoCompression),
+        rep_->table_options.filter_policy->GetFilterBitsReader(slice), nullptr);
+    return {obj, nullptr};
+  }
+};
+
+class PartitionedFilterBlockTest : public testing::Test {
+ public:
+  BlockBasedTableOptions table_options_;
+  InternalKeyComparator icomp = InternalKeyComparator(BytewiseComparator());
+
+  PartitionedFilterBlockTest() {
+    table_options_.filter_policy.reset(NewBloomFilterPolicy(10, false));
+    table_options_.no_block_cache = true;  // Otherwise BlockBasedTable::Close
+                                           // will access variable that are not
+                                           // initialized in our mocked version
+  }
+
+  std::shared_ptr<Cache> cache_;
+  ~PartitionedFilterBlockTest() {}
+
+  const std::string keys[4] = {"afoo", "bar", "box", "hello"};
+  const std::string missing_keys[2] = {"missing", "other"};
+
+  int last_offset = 10;
+  BlockHandle Write(const Slice& slice) {
+    BlockHandle bh(last_offset + 1, slice.size());
+    slices[bh.offset()] = slice;
+    last_offset += bh.size();
+    return bh;
+  }
+
+  PartitionedIndexBuilder* NewIndexBuilder() {
+    return PartitionedIndexBuilder::CreateIndexBuilder(&icomp, table_options_);
+  }
+
+  PartitionedFilterBlockBuilder* NewBuilder(
+      PartitionedIndexBuilder* const p_index_builder) {
+    return new PartitionedFilterBlockBuilder(
+        nullptr, table_options_.whole_key_filtering,
+        table_options_.filter_policy->GetFilterBitsBuilder(),
+        table_options_.index_block_restart_interval, p_index_builder);
+  }
+
+  std::unique_ptr<MockedBlockBasedTable> table;
+
+  PartitionedFilterBlockReader* NewReader(
+      PartitionedFilterBlockBuilder* builder) {
+    BlockHandle bh;
+    Status status;
+    Slice slice;
+    do {
+      slice = builder->Finish(bh, &status);
+      bh = Write(slice);
+    } while (status.IsIncomplete());
+    const Options options;
+    const ImmutableCFOptions ioptions(options);
+    const EnvOptions env_options;
+    table.reset(new MockedBlockBasedTable(new BlockBasedTable::Rep(
+        ioptions, env_options, table_options_, icomp, false)));
+    auto reader = new PartitionedFilterBlockReader(
+        nullptr, true, BlockContents(slice, false, kNoCompression), nullptr,
+        nullptr, *icomp.user_comparator(), table.get());
+    return reader;
+  }
+
+  void VerifyReader(PartitionedFilterBlockBuilder* builder,
+                    bool empty = false) {
+    std::unique_ptr<PartitionedFilterBlockReader> reader(NewReader(builder));
+    // Querying added keys
+    const bool no_io = true;
+    for (auto key : keys) {
+      auto ikey = InternalKey(key, 0, ValueType::kTypeValue);
+      const Slice ikey_slice = Slice(*ikey.rep());
+      ASSERT_TRUE(reader->KeyMayMatch(key, kNotValid, !no_io, &ikey_slice));
+    }
+    {
+      // querying a key twice
+      auto ikey = InternalKey(keys[0], 0, ValueType::kTypeValue);
+      const Slice ikey_slice = Slice(*ikey.rep());
+      ASSERT_TRUE(reader->KeyMayMatch(keys[0], kNotValid, !no_io, &ikey_slice));
+    }
+    // querying missing keys
+    for (auto key : missing_keys) {
+      auto ikey = InternalKey(key, 0, ValueType::kTypeValue);
+      const Slice ikey_slice = Slice(*ikey.rep());
+      if (empty) {
+        ASSERT_TRUE(reader->KeyMayMatch(key, kNotValid, !no_io, &ikey_slice));
+      } else {
+        // assuming a good hash function
+        ASSERT_FALSE(reader->KeyMayMatch(key, kNotValid, !no_io, &ikey_slice));
+      }
+    }
+  }
+
+  void TestBlockPerKey() {
+    table_options_.index_per_partition = 1;
+    std::unique_ptr<PartitionedIndexBuilder> pib(NewIndexBuilder());
+    std::unique_ptr<PartitionedFilterBlockBuilder> builder(
+        NewBuilder(pib.get()));
+    int i = 0;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i], keys[i + 1]);
+    i++;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i], keys[i + 1]);
+    i++;
+    builder->Add(keys[i]);
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i], keys[i + 1]);
+    i++;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i]);
+
+    VerifyReader(builder.get());
+  }
+
+  void TestBlockPerTwoKeys() {
+    std::unique_ptr<PartitionedIndexBuilder> pib(NewIndexBuilder());
+    std::unique_ptr<PartitionedFilterBlockBuilder> builder(
+        NewBuilder(pib.get()));
+    int i = 0;
+    builder->Add(keys[i]);
+    i++;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i], keys[i + 1]);
+    i++;
+    builder->Add(keys[i]);
+    builder->Add(keys[i]);
+    i++;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i]);
+
+    VerifyReader(builder.get());
+  }
+
+  void TestBlockPerAllKeys() {
+    std::unique_ptr<PartitionedIndexBuilder> pib(NewIndexBuilder());
+    std::unique_ptr<PartitionedFilterBlockBuilder> builder(
+        NewBuilder(pib.get()));
+    int i = 0;
+    builder->Add(keys[i]);
+    i++;
+    builder->Add(keys[i]);
+    i++;
+    builder->Add(keys[i]);
+    builder->Add(keys[i]);
+    i++;
+    builder->Add(keys[i]);
+    CutABlock(pib.get(), keys[i]);
+
+    VerifyReader(builder.get());
+  }
+
+  void CutABlock(PartitionedIndexBuilder* builder,
+                 const std::string& user_key) {
+    // Assuming a block is cut, add an entry to the index
+    std::string key =
+        std::string(*InternalKey(user_key, 0, ValueType::kTypeValue).rep());
+    BlockHandle dont_care_block_handle(1, 1);
+    builder->AddIndexEntry(&key, nullptr, dont_care_block_handle);
+  }
+
+  void CutABlock(PartitionedIndexBuilder* builder, const std::string& user_key,
+                 const std::string& next_user_key) {
+    // Assuming a block is cut, add an entry to the index
+    std::string key =
+        std::string(*InternalKey(user_key, 0, ValueType::kTypeValue).rep());
+    std::string next_key = std::string(
+        *InternalKey(next_user_key, 0, ValueType::kTypeValue).rep());
+    BlockHandle dont_care_block_handle(1, 1);
+    Slice slice = Slice(next_key.data(), next_key.size());
+    builder->AddIndexEntry(&key, &slice, dont_care_block_handle);
+  }
+};
+
+TEST_F(PartitionedFilterBlockTest, EmptyBuilder) {
+  std::unique_ptr<PartitionedIndexBuilder> pib(NewIndexBuilder());
+  std::unique_ptr<PartitionedFilterBlockBuilder> builder(NewBuilder(pib.get()));
+  const bool empty = true;
+  VerifyReader(builder.get(), empty);
+}
+
+TEST_F(PartitionedFilterBlockTest, OneBlock) {
+  int num_keys = sizeof(keys) / sizeof(*keys);
+  for (int i = 1; i < num_keys + 1; i++) {
+    table_options_.index_per_partition = i;
+    TestBlockPerAllKeys();
+  }
+}
+
+TEST_F(PartitionedFilterBlockTest, TwoBlocksPerKey) {
+  int num_keys = sizeof(keys) / sizeof(*keys);
+  for (int i = 1; i < num_keys + 1; i++) {
+    table_options_.index_per_partition = i;
+    TestBlockPerTwoKeys();
+  }
+}
+
+TEST_F(PartitionedFilterBlockTest, OneBlockPerKey) {
+  int num_keys = sizeof(keys) / sizeof(*keys);
+  for (int i = 1; i < num_keys + 1; i++) {
+    table_options_.index_per_partition = i;
+    TestBlockPerKey();
+  }
+}
+
+}  // namespace rocksdb
+
+int main(int argc, char** argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}