Set optimize_filters_for_memory by default (#12377)

Summary:
This feature has been around for a couple of years and users haven't reported any problems with it.

Not quite related: fixed a technical ODR violation in public header for info_log_level in case DEBUG build status changes.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/12377

Test Plan: unit tests updated, already in crash test. Some unit tests are expecting specific behaviors of optimize_filters_for_memory=false and we now need to bake that in.

Reviewed By: jowlyzhang

Differential Revision: D54129517

Pulled By: pdillinger

fbshipit-source-id: a64b614840eadd18b892624187b3e122bab6719c

db/c_test.c

@@ -1318,6 +1318,8 @@ int main(int argc, char** argv) {
       policy = rocksdb_filterpolicy_create_ribbon_hybrid(8.0, 1);
     }
     rocksdb_block_based_options_set_filter_policy(table_options, policy);
+    rocksdb_block_based_options_set_optimize_filters_for_memory(table_options,
+                                                                0);
 
     // Create new database
     rocksdb_close(db);

db/db_bloom_filter_test.cc

@@ -529,6 +529,7 @@ TEST_P(DBBloomFilterTestWithParam, BloomFilter) {
     BlockBasedTableOptions table_options;
     table_options.no_block_cache = true;
     table_options.filter_policy = Create(10, bfp_impl_);
+    table_options.optimize_filters_for_memory = false;
     table_options.partition_filters = partition_filters_;
     if (partition_filters_) {
       table_options.index_type =
@@ -1695,6 +1696,7 @@ TEST_F(DBBloomFilterTest, ContextCustomFilterPolicy) {
     BlockBasedTableOptions table_options;
     table_options.filter_policy = policy;
     table_options.format_version = 5;
+    table_options.optimize_filters_for_memory = false;
     options.table_factory.reset(NewBlockBasedTableFactory(table_options));
 
     ASSERT_OK(TryReopen(options));

env/env.cc

@@ -825,6 +825,15 @@ WritableFile::~WritableFile() = default;
 
 MemoryMappedFileBuffer::~MemoryMappedFileBuffer() = default;
 
+// This const variable can be used in public headers without introducing the
+// possibility of ODR violations due to varying macro definitions.
+const InfoLogLevel Logger::kDefaultLogLevel =
+#ifdef NDEBUG
+    INFO_LEVEL;
+#else
+    DEBUG_LEVEL;
+#endif  // NDEBUG
+
 Logger::~Logger() = default;
 
 Status Logger::Close() {

include/rocksdb/env.h

@@ -1209,6 +1209,10 @@ class Logger {
  public:
   static constexpr size_t kDoNotSupportGetLogFileSize = SIZE_MAX;
 
+  // Set to INFO_LEVEL when RocksDB is compiled in release mode, and
+  // DEBUG_LEVEL when compiled in debug mode. See DBOptions::info_log_level.
+  static const InfoLogLevel kDefaultLogLevel;
+
   explicit Logger(const InfoLogLevel log_level = InfoLogLevel::INFO_LEVEL)
       : closed_(false), log_level_(log_level) {}
   // No copying allowed

include/rocksdb/options.h

@@ -643,11 +643,10 @@ struct DBOptions {
   // Default: nullptr
   std::shared_ptr<Logger> info_log = nullptr;
 
-#ifdef NDEBUG
-  InfoLogLevel info_log_level = INFO_LEVEL;
-#else
-  InfoLogLevel info_log_level = DEBUG_LEVEL;
-#endif  // NDEBUG
+  // Minimum level for sending log messages to info_log. The default is
+  // INFO_LEVEL when RocksDB is compiled in release mode, and DEBUG_LEVEL
+  // when it is compiled in debug mode.
+  InfoLogLevel info_log_level = Logger::kDefaultLogLevel;
 
   // Number of open files that can be used by the DB.  You may need to
   // increase this if your database has a large working set. Value -1 means

include/rocksdb/table.h

@@ -426,12 +426,12 @@ struct BlockBasedTableOptions {
   // the block cache better at using space it is allowed. (These issues
   // should not arise with partitioned filters.)
   //
-  // NOTE: Do not set to true if you do not trust malloc_usable_size. With
-  // this option, RocksDB might access an allocated memory object beyond its
-  // original size if malloc_usable_size says it is safe to do so. While this
-  // can be considered bad practice, it should not produce undefined behavior
-  // unless malloc_usable_size is buggy or broken.
-  bool optimize_filters_for_memory = false;
+  // NOTE: Set to false if you do not trust malloc_usable_size. When set to
+  // true, RocksDB might access an allocated memory object beyond its original
+  // size if malloc_usable_size says it is safe to do so. While this can be
+  // considered bad practice, it should not produce undefined behavior unless
+  // malloc_usable_size is buggy or broken.
+  bool optimize_filters_for_memory = true;
 
   // Use delta encoding to compress keys in blocks.
   // ReadOptions::pin_data requires this option to be disabled.

java/src/main/java/org/rocksdb/BlockBasedTableConfig.java

@@ -31,7 +31,7 @@ public class BlockBasedTableConfig extends TableFormatConfig {
     indexBlockRestartInterval = 1;
     metadataBlockSize = 4096;
     partitionFilters = false;
-    optimizeFiltersForMemory = false;
+    optimizeFiltersForMemory = true;
     useDeltaEncoding = true;
     filterPolicy = null;
     wholeKeyFiltering = true;

java/src/test/java/org/rocksdb/OptionsUtilTest.java

@@ -289,7 +289,7 @@ public class OptionsUtilTest {
     altCFTableConfig.setIndexBlockRestartInterval(6);
     altCFTableConfig.setMetadataBlockSize(12 * 1024);
     altCFTableConfig.setPartitionFilters(true);
-    altCFTableConfig.setOptimizeFiltersForMemory(true);
+    altCFTableConfig.setOptimizeFiltersForMemory(false);
     altCFTableConfig.setUseDeltaEncoding(false);
     altCFTableConfig.setFilterPolicy(new BloomFilter(7.5));
     altCFTableConfig.setWholeKeyFiltering(false);

memory/memory_allocator.cc

@@ -77,4 +77,5 @@ Status MemoryAllocator::CreateFromString(
   copy.invoke_prepare_options = true;
   return LoadManagedObject<MemoryAllocator>(copy, value, result);
 }
+
 }  // namespace ROCKSDB_NAMESPACE

table/block_based/filter_policy.cc

@@ -425,6 +425,9 @@ class FastLocalBloomBitsBuilder : public XXPH3FilterBitsBuilder {
   }
 
   double EstimatedFpRate(size_t keys, size_t len_with_metadata) override {
+    if (len_with_metadata <= kMetadataLen) {
+      return keys > 0 ? 1.0 : 0.0;
+    }
     int num_probes = GetNumProbes(keys, len_with_metadata);
     return FastLocalBloomImpl::EstimatedFpRate(
         keys, len_with_metadata - kMetadataLen, num_probes, /*hash bits*/ 64);
@@ -891,6 +894,9 @@ class Standard128RibbonBitsBuilder : public XXPH3FilterBitsBuilder {
 
   double EstimatedFpRate(size_t num_entries,
                          size_t len_with_metadata) override {
+    if (len_with_metadata <= kMetadataLen) {
+      return num_entries > 0 ? 1.0 : 0.0;
+    }
     if (num_entries > kMaxRibbonEntries) {
       // More entries than supported by this Ribbon
       return bloom_fallback_.EstimatedFpRate(num_entries, len_with_metadata);
@@ -1030,9 +1036,12 @@ class LegacyBloomBitsBuilder : public BuiltinFilterBitsBuilder {
     return CalculateSpace(num_entries, &dont_care1, &dont_care2);
   }
 
-  double EstimatedFpRate(size_t keys, size_t bytes) override {
-    return LegacyBloomImpl::EstimatedFpRate(keys, bytes - kMetadataLen,
-                                            num_probes_);
+  double EstimatedFpRate(size_t keys, size_t len_with_metadata) override {
+    if (len_with_metadata <= kMetadataLen) {
+      return keys > 0 ? 1.0 : 0.0;
+    }
+    return LegacyBloomImpl::EstimatedFpRate(
+        keys, len_with_metadata - kMetadataLen, num_probes_);
   }
 
   size_t ApproximateNumEntries(size_t bytes) override;

unreleased_history/behavior_changes/default_optimize_filters_for_memory.md

@@ -0,0 +1 @@
+`BlockBasedTableOptions::optimize_filters_for_memory` is now set to true by default. When `partition_filters=false`, this could lead to somewhat increased average RSS memory usage by the block cache, but this "extra" usage is within the allowed memory budget and should make memory usage more consistent (by minimizing internal fragmentation for more kinds of blocks).

util/bloom_test.cc

@@ -290,6 +290,9 @@ TEST_P(FullBloomTest, FullSmall) {
 }
 
 TEST_P(FullBloomTest, FullVaryingLengths) {
+  // Match how this test was originally built
+  table_options_.optimize_filters_for_memory = false;
+
   char buffer[sizeof(int)];
 
   // Count number of filters that significantly exceed the false positive rate
@@ -335,6 +338,9 @@ TEST_P(FullBloomTest, FullVaryingLengths) {
 }
 
 TEST_P(FullBloomTest, OptimizeForMemory) {
+  // Verify default option
+  EXPECT_EQ(BlockBasedTableOptions().optimize_filters_for_memory, true);
+
   char buffer[sizeof(int)];
   for (bool offm : {true, false}) {
     table_options_.optimize_filters_for_memory = offm;
@@ -354,8 +360,9 @@ TEST_P(FullBloomTest, OptimizeForMemory) {
       Build();
       size_t size = FilterData().size();
       total_size += size;
-      // optimize_filters_for_memory currently depends on malloc_usable_size
-      // but we run the rest of the test to ensure no bad behavior without it.
+      // optimize_filters_for_memory currently only has an effect with
+      // malloc_usable_size support, but we run the rest of the test to ensure
+      // no bad behavior without it.
 #ifdef ROCKSDB_MALLOC_USABLE_SIZE
       size = malloc_usable_size(const_cast<char*>(FilterData().data()));
 #endif  // ROCKSDB_MALLOC_USABLE_SIZE
@@ -508,6 +515,9 @@ inline uint32_t SelectByCacheLineSize(uint32_t for64, uint32_t for128,
 // ability to read filters generated using other cache line sizes.
 // See RawSchema.
 TEST_P(FullBloomTest, Schema) {
+  // Match how this test was originally built
+  table_options_.optimize_filters_for_memory = false;
+
 #define EXPECT_EQ_Bloom(a, b)               \
   {                                         \
     if (GetParam() != kStandard128Ribbon) { \