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Add new API CacheReservationManager::GetDummyEntrySize() (#9072)

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Summary:
Note: it might conflict with another CRM related PR https://github.com/facebook/rocksdb/pull/9071 and so will merge after that's merged.

Context:
As `CacheReservationManager` being used by more memory users, it is convenient to retrieve the dummy entry size for `CacheReservationManager` instead of hard-coding `256 * 1024` in writing tests. Plus it allows more flexibility to change our implementation on dummy entry size.

A follow-up PR is needed to replace those hard-coded dummy entry size value in `db_test2.cc`, `db_write_buffer_manager_test.cc`, `write_buffer_manager_test.cc`, `table_test.cc` and the ones introduced in https://github.com/facebook/rocksdb/pull/9072#issue-1034326069.
- Exposed the private static constexpr `kDummyEntrySize` through public static `CacheReservationManager::GetDummyEntrySize()`

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9072

Test Plan:
- Passing new tests
- Passing existing tests

Reviewed By: ajkr

Differential Revision: D32043684

Pulled By: hx235

fbshipit-source-id: ddefc6921c052adab6a2cda2394eb26da3076a50
This commit is contained in:
Hui Xiao 2021-11-01 14:42:11 -07:00 committed by Facebook GitHub Bot
parent a2b9be42b6
commit 560fe70233
2 changed files with 12 additions and 6 deletions
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2
cache/cache_reservation_manager.h vendored
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@ -75,6 +75,8 @@ class CacheReservationManager {
Status UpdateCacheReservation(std::size_t new_memory_used); Status UpdateCacheReservation(std::size_t new_memory_used);
std::size_t GetTotalReservedCacheSize(); std::size_t GetTotalReservedCacheSize();
static constexpr std::size_t GetDummyEntrySize() { return kSizeDummyEntry; }
private: private:
static constexpr std::size_t kSizeDummyEntry = 256 * 1024; static constexpr std::size_t kSizeDummyEntry = 256 * 1024;
// The key will be longer than keys for blocks in SST files so they won't // The key will be longer than keys for blocks in SST files so they won't

12
cache/cache_reservation_manager_test.cc vendored
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@ -25,7 +25,8 @@ class CacheReservationManagerTest : public ::testing::Test {
static constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024; static constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024;
static constexpr int kNumShardBits = 0; // 2^0 shard static constexpr int kNumShardBits = 0; // 2^0 shard
static constexpr std::size_t kSizeDummyEntry = 256 * 1024; static constexpr std::size_t kSizeDummyEntry =
CacheReservationManager::GetDummyEntrySize();
static const std::size_t kCacheKeyPrefixSize = static const std::size_t kCacheKeyPrefixSize =
BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length; BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length;
static constexpr std::size_t kMetaDataChargeOverhead = 10000; static constexpr std::size_t kMetaDataChargeOverhead = 10000;
@ -143,7 +144,8 @@ TEST(CacheReservationManagerIncreaseReservcationOnFullCacheTest,
IncreaseCacheReservationOnFullCache) { IncreaseCacheReservationOnFullCache) {
constexpr std::size_t kOneMegabyte = 1024 * 1024; constexpr std::size_t kOneMegabyte = 1024 * 1024;
constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024; constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024;
constexpr std::size_t kSizeDummyEntry = 256 * 1024; constexpr std::size_t kSizeDummyEntry =
CacheReservationManager::GetDummyEntrySize();
constexpr std::size_t kMetaDataChargeOverhead = 10000; constexpr std::size_t kMetaDataChargeOverhead = 10000;
LRUCacheOptions lo; LRUCacheOptions lo;
@ -307,7 +309,8 @@ TEST_F(CacheReservationManagerTest,
TEST(CacheReservationManagerWithDelayedDecreaseTest, TEST(CacheReservationManagerWithDelayedDecreaseTest,
DecreaseCacheReservationWithDelayedDecrease) { DecreaseCacheReservationWithDelayedDecrease) {
constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024; constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024;
constexpr std::size_t kSizeDummyEntry = 256 * 1024; constexpr std::size_t kSizeDummyEntry =
CacheReservationManager::GetDummyEntrySize();
constexpr std::size_t kMetaDataChargeOverhead = 10000; constexpr std::size_t kMetaDataChargeOverhead = 10000;
LRUCacheOptions lo; LRUCacheOptions lo;
@ -379,7 +382,8 @@ TEST(CacheReservationManagerWithDelayedDecreaseTest,
TEST(CacheReservationManagerDestructorTest, TEST(CacheReservationManagerDestructorTest,
ReleaseRemainingDummyEntriesOnDestruction) { ReleaseRemainingDummyEntriesOnDestruction) {
constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024; constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024;
constexpr std::size_t kSizeDummyEntry = 256 * 1024; constexpr std::size_t kSizeDummyEntry =
CacheReservationManager::GetDummyEntrySize();
constexpr std::size_t kMetaDataChargeOverhead = 10000; constexpr std::size_t kMetaDataChargeOverhead = 10000;
LRUCacheOptions lo; LRUCacheOptions lo;