rocksdb

Commit Graph

Author	SHA1	Message	Date
Bo Wang	d490bfcdb6	Avoid recompressing cold block in CompressedSecondaryCache (#10527 ) Summary: Summary: When a block is firstly `Lookup` from the secondary cache, we just insert a dummy block in the primary cache (charging the actual size of the block) and don’t erase the block from the secondary cache. A standalone handle is returned from `Lookup`. Only if the block is hit again, we erase it from the secondary cache and add it into the primary cache. When a block is firstly evicted from the primary cache to the secondary cache, we just insert a dummy block (size 0) in the secondary cache. When the block is evicted again, it is treated as a hot block and is inserted into the secondary cache. Implementation Details Add a new state of LRUHandle: The handle is never inserted into the LRUCache (both hash table and LRU list) and it doesn't experience the above three states. The entry can be freed when refs becomes 0. (refs >= 1 && in_cache == false && IS_STANDALONE == true) The behaviors of `LRUCacheShard::Lookup()` are updated if the secondary_cache is CompressedSecondaryCache: 1. If a handle is found in primary cache: 1.1. If the handle's value is not nullptr, it is returned immediately. 1.2. If the handle's value is nullptr, this means the handle is a dummy one. For a dummy handle, if it was retrieved from secondary cache, it may still exist in secondary cache. - 1.2.1. If no valid handle can be `Lookup` from secondary cache, return nullptr. - 1.2.2. If the handle from secondary cache is valid, erase it from the secondary cache and add it into the primary cache. 2. If a handle is not found in primary cache: 2.1. If no valid handle can be `Lookup` from secondary cache, return nullptr. 2.2. If the handle from secondary cache is valid, insert a dummy block in the primary cache (charging the actual size of the block) and return a standalone handle. The behaviors of `LRUCacheShard::Promote()` are updated as follows: 1. If `e->sec_handle` has value, one of the following steps can happen: 1.1. Insert a dummy handle and return a standalone handle to caller when `secondary_cache_` is `CompressedSecondaryCache` and e is a standalone handle. 1.2. Insert the item into the primary cache and return the handle to caller. 1.3. Exception handling. 3. If `e->sec_handle` has no value, mark the item as not in cache and charge the cache as its only metadata that'll shortly be released. The behavior of `CompressedSecondaryCache::Insert()` is updated: 1. If a block is evicted from the primary cache for the first time, a dummy item is inserted. 4. If a dummy item is found for a block, the block is inserted into the secondary cache. The behavior of `CompressedSecondaryCache:::Lookup()` is updated: 1. If a handle is not found or it is a dummy item, a nullptr is returned. 2. If `erase_handle` is true, the handle is erased. The behaviors of `LRUCacheShard::Release()` are adjusted for the standalone handles. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10527 Test Plan: 1. stress tests. 5. unit tests. 6. CPU profiling for db_bench. Reviewed By: siying Differential Revision: D38747613 Pulled By: gitbw95 fbshipit-source-id: 74a1eba7e1957c9affb2bd2ae3e0194584fa6eca	2 years ago
Bo Wang	13cb7a84b6	Fix the memory leak in db_stress tests that are caused by `FaultInjectionSecondaryCache` and add `CompressedSecondaryCache` into stress tests. (#10523 ) Summary: 1. Fix the memory leak in db_stress tests that are caused by `FaultInjectionSecondaryCache`. To address the test requirements for both CompressedSecondaryCache and CachlibWrapper, a new class variable `base_is_compressed_sec_cache_` is added to determine the different behaviors in `Lookup()` and `WaitAll()`. 2. Add `CompressedSecondaryCache` into stress tests. Before this PR, memory leak is reported during crash tests if `CompressedSecondaryCache` is in stress tests. One example is shown as follows: ``` ==70722==ERROR: LeakSanitizer: detected memory leaks Direct leak of 6648240 byte(s) in 83103 object(s) allocated from: #0 0x13de9d7 in operator new(unsigned long) (/data/sandcastle/boxes/eden-trunk-hg-fbcode-fbsource/fbcode/buck-out/dbgo/gen/aab7ed39/internal_repo_rocksdb/repo/db_stress+0x13de9d7) https://github.com/facebook/rocksdb/issues/1 0x9084c7 in rocksdb::BlocklikeTraits<rocksdb::Block>::Create(rocksdb::BlockContents&&, unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const) internal_repo_rocksdb/repo/table/block_based/block_like_traits.h:128 https://github.com/facebook/rocksdb/issues/2 0x9084c7 in std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)::operator()(void const, unsigned long, void, unsigned long) const internal_repo_rocksdb/repo/table/block_based/block_like_traits.h:34 https://github.com/facebook/rocksdb/issues/3 0x9082c9 in rocksdb::Block std::__invoke_impl<rocksdb::Status, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)&, void const, unsigned long, void, unsigned long>(std::__invoke_other, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)&, void const&&, unsigned long&&, void&&, unsigned long&&) third-party-buck/platform010/build/libgcc/include/c++/trunk/bits/invoke.h:61 https://github.com/facebook/rocksdb/issues/4 0x90825d in std::enable_if<is_invocable_r_v<rocksdb::Block, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)&, void const, unsigned long, void, unsigned long>, rocksdb::Block>::type std::__invoke_r<rocksdb::Status, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)&, void const, unsigned long, void, unsigned long>(std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)&, void const&&, unsigned long&&, void&&, unsigned long&&) third-party-buck/platform010/build/libgcc/include/c++/trunk/bits/invoke.h:114 https://github.com/facebook/rocksdb/issues/5 0x9081b0 in std::_Function_handler<rocksdb::Status (void const, unsigned long, void, unsigned long), std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> rocksdb::GetCreateCallback<rocksdb::Block>(unsigned long, rocksdb::Statistics, bool, rocksdb::FilterPolicy const)::'lambda'(void const, unsigned long, void, unsigned long)>::_M_invoke(std::_Any_data const&, void const&&, unsigned long&&, void&&, unsigned long&&) third-party-buck/platform010/build/libgcc/include/c++/trunk/bits/std_function.h:291 https://github.com/facebook/rocksdb/issues/6 0x991f2c in std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)>::operator()(void const, unsigned long, void, unsigned long) const third-party-buck/platform010/build/libgcc/include/c++/trunk/bits/std_function.h:560 https://github.com/facebook/rocksdb/issues/7 0x990277 in rocksdb::CompressedSecondaryCache::Lookup(rocksdb::Slice const&, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> const&, bool, bool&) internal_repo_rocksdb/repo/cache/compressed_secondary_cache.cc:77 https://github.com/facebook/rocksdb/issues/8 0xd3aa4d in rocksdb::FaultInjectionSecondaryCache::Lookup(rocksdb::Slice const&, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> const&, bool, bool&) internal_repo_rocksdb/repo/utilities/fault_injection_secondary_cache.cc:92 https://github.com/facebook/rocksdb/issues/9 0xeadaab in rocksdb::lru_cache::LRUCacheShard::Lookup(rocksdb::Slice const&, unsigned int, rocksdb::Cache::CacheItemHelper const, std::function<rocksdb::Status (void const, unsigned long, void*, unsigned long)> const&, rocksdb::Cache::Priority, bool, rocksdb::Statistics) internal_repo_rocksdb/repo/cache/lru_cache.cc:445 https://github.com/facebook/rocksdb/issues/10 0x1064573 in rocksdb::ShardedCache::Lookup(rocksdb::Slice const&, rocksdb::Cache::CacheItemHelper const, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> const&, rocksdb::Cache::Priority, bool, rocksdb::Statistics) internal_repo_rocksdb/repo/cache/sharded_cache.cc:89 https://github.com/facebook/rocksdb/issues/11 0x8be0df in rocksdb::BlockBasedTable::GetEntryFromCache(rocksdb::CacheTier const&, rocksdb::Cache, rocksdb::Slice const&, rocksdb::BlockType, bool, rocksdb::GetContext, rocksdb::Cache::CacheItemHelper const, std::function<rocksdb::Status (void const, unsigned long, void, unsigned long)> const&, rocksdb::Cache::Priority) const internal_repo_rocksdb/repo/table/block_based/block_based_table_reader.cc:389 https://github.com/facebook/rocksdb/issues/12 0x905790 in rocksdb::Status rocksdb::BlockBasedTable::GetDataBlockFromCache<rocksdb::Block>(rocksdb::Slice const&, rocksdb::Cache, rocksdb::Cache, rocksdb::ReadOptions const&, rocksdb::CachableEntry<rocksdb::Block>, rocksdb::UncompressionDict const&, rocksdb::BlockType, bool, rocksdb::GetContext) const internal_repo_rocksdb/repo/table/block_based/block_based_table_reader.cc:1263 https://github.com/facebook/rocksdb/issues/13 0x8b9259 in rocksdb::Status rocksdb::BlockBasedTable::MaybeReadBlockAndLoadToCache<rocksdb::Block>(rocksdb::FilePrefetchBuffer, rocksdb::ReadOptions const&, rocksdb::BlockHandle const&, rocksdb::UncompressionDict const&, bool, bool, rocksdb::CachableEntry<rocksdb::Block>, rocksdb::BlockType, rocksdb::GetContext, rocksdb::BlockCacheLookupContext, rocksdb::BlockContents, bool) const internal_repo_rocksdb/repo/table/block_based/block_based_table_reader.cc:1559 https://github.com/facebook/rocksdb/issues/14 0x8b710c in rocksdb::Status rocksdb::BlockBasedTable::RetrieveBlock<rocksdb::Block>(rocksdb::FilePrefetchBuffer, rocksdb::ReadOptions const&, rocksdb::BlockHandle const&, rocksdb::UncompressionDict const&, rocksdb::CachableEntry<rocksdb::Block>, rocksdb::BlockType, rocksdb::GetContext, rocksdb::BlockCacheLookupContext, bool, bool, bool, bool) const internal_repo_rocksdb/repo/table/block_based/block_based_table_reader.cc:1726 https://github.com/facebook/rocksdb/issues/15 0x8c329f in rocksdb::DataBlockIter rocksdb::BlockBasedTable::NewDataBlockIterator<rocksdb::DataBlockIter>(rocksdb::ReadOptions const&, rocksdb::BlockHandle const&, rocksdb::DataBlockIter, rocksdb::BlockType, rocksdb::GetContext, rocksdb::BlockCacheLookupContext, rocksdb::FilePrefetchBuffer, bool, bool, rocksdb::Status&) const internal_repo_rocksdb/repo/table/block_based/block_based_table_reader_impl.h:58 https://github.com/facebook/rocksdb/issues/16 0x920117 in rocksdb::BlockBasedTableIterator::InitDataBlock() internal_repo_rocksdb/repo/table/block_based/block_based_table_iterator.cc:262 https://github.com/facebook/rocksdb/issues/17 0x920d42 in rocksdb::BlockBasedTableIterator::MaterializeCurrentBlock() internal_repo_rocksdb/repo/table/block_based/block_based_table_iterator.cc:332 https://github.com/facebook/rocksdb/issues/18 0xc6a201 in rocksdb::IteratorWrapperBase<rocksdb::Slice>::PrepareValue() internal_repo_rocksdb/repo/table/iterator_wrapper.h:78 https://github.com/facebook/rocksdb/issues/19 0xc6a201 in rocksdb::IteratorWrapperBase<rocksdb::Slice>::PrepareValue() internal_repo_rocksdb/repo/table/iterator_wrapper.h:78 https://github.com/facebook/rocksdb/issues/20 0xef9f6c in rocksdb::MergingIterator::PrepareValue() internal_repo_rocksdb/repo/table/merging_iterator.cc:260 https://github.com/facebook/rocksdb/issues/21 0xc6a201 in rocksdb::IteratorWrapperBase<rocksdb::Slice>::PrepareValue() internal_repo_rocksdb/repo/table/iterator_wrapper.h:78 https://github.com/facebook/rocksdb/issues/22 0xc67bcd in rocksdb::DBIter::FindNextUserEntryInternal(bool, rocksdb::Slice const) internal_repo_rocksdb/repo/db/db_iter.cc:326 https://github.com/facebook/rocksdb/issues/23 0xc66d36 in rocksdb::DBIter::FindNextUserEntry(bool, rocksdb::Slice const) internal_repo_rocksdb/repo/db/db_iter.cc:234 https://github.com/facebook/rocksdb/issues/24 0xc7ab47 in rocksdb::DBIter::Next() internal_repo_rocksdb/repo/db/db_iter.cc:161 https://github.com/facebook/rocksdb/issues/25 0x70d938 in rocksdb::BatchedOpsStressTest::TestPrefixScan(rocksdb::ThreadState, rocksdb::ReadOptions const&, std::vector<int, std::allocator<int> > const&, std::vector<long, std::allocator<long> > const&) internal_repo_rocksdb/repo/db_stress_tool/batched_ops_stress.cc:320 https://github.com/facebook/rocksdb/issues/26 0x6dc6a8 in rocksdb::StressTest::OperateDb(rocksdb::ThreadState) internal_repo_rocksdb/repo/db_stress_tool/db_stress_test_base.cc:907 https://github.com/facebook/rocksdb/issues/27 0x6867de in rocksdb::ThreadBody(void) internal_repo_rocksdb/repo/db_stress_tool/db_stress_driver.cc:33 https://github.com/facebook/rocksdb/issues/28 0xce4cc2 in rocksdb::(anonymous namespace)::StartThreadWrapper(void) internal_repo_rocksdb/repo/env/env_posix.cc:461 https://github.com/facebook/rocksdb/issues/29 0x7f23f9068c0e in start_thread /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/nptl/pthread_create.c:434:8 ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10523 Test Plan: ``` $COMPILE_WITH_ASAN=1 make -j 24 $db_stress J=40 crash_test_with_txn ``` Reviewed By: anand1976 Differential Revision: D38646839 Pulled By: gitbw95 fbshipit-source-id: 9452895c7dc95481a9d7afe83b15193cf5b1c43e	2 years ago
gitbw95	f241d082b6	Prevent double caching in the compressed secondary cache (#9747 ) Summary: ### Summary: When both LRU Cache and CompressedSecondaryCache are configured together, there possibly are some data blocks double cached. Changes include: 1. Update IS_PROMOTED to IS_IN_SECONDARY_CACHE to prevent confusions. 2. This PR updates SecondaryCacheResultHandle and use IsErasedFromSecondaryCache to determine whether the handle is erased in the secondary cache. Then, the caller can determine whether to SetIsInSecondaryCache(). 3. Rename LRUSecondaryCache to CompressedSecondaryCache. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9747 Test Plan: Test Scripts: 1. Populate a DB. The on disk footprint is 482 MB. The data is set to be 50% compressible, so the total decompressed size is expected to be 964 MB. ./db_bench --benchmarks=fillrandom --num=10000000 -db=/db_bench_1 2. overwrite it to a stable state: ./db_bench --benchmarks=overwrite,stats --num=10000000 -use_existing_db -duration=10 --benchmark_write_rate_limit=2000000 -db=/db_bench_1 4. Run read tests with diffeernt cache setting: T1: ./db_bench --benchmarks=seekrandom,stats --threads=16 --num=10000000 -use_existing_db -duration=120 --benchmark_write_rate_limit=52000000 -use_direct_reads --cache_size=520000000 --statistics -db=/db_bench_1 T2: ./db_bench --benchmarks=seekrandom,stats --threads=16 --num=10000000 -use_existing_db -duration=120 --benchmark_write_rate_limit=52000000 -use_direct_reads --cache_size=320000000 -compressed_secondary_cache_size=400000000 --statistics -use_compressed_secondary_cache -db=/db_bench_1 T3: ./db_bench --benchmarks=seekrandom,stats --threads=16 --num=10000000 -use_existing_db -duration=120 --benchmark_write_rate_limit=52000000 -use_direct_reads --cache_size=520000000 -compressed_secondary_cache_size=400000000 --statistics -use_compressed_secondary_cache -db=/db_bench_1 T4: ./db_bench --benchmarks=seekrandom,stats --threads=16 --num=10000000 -use_existing_db -duration=120 --benchmark_write_rate_limit=52000000 -use_direct_reads --cache_size=20000000 -compressed_secondary_cache_size=500000000 --statistics -use_compressed_secondary_cache -db=/db_bench_1 Before this PR \| Cache Size \| Compressed Secondary Cache Size \| Cache Hit Rate \| \|------------\|-------------------------------------\|----------------\| \|520 MB \| 0 MB \| 85.5% \| \|320 MB \| 400 MB \| 96.2% \| \|520 MB \| 400 MB \| 98.3% \| \|20 MB \| 500 MB \| 98.8% \| Before this PR \| Cache Size \| Compressed Secondary Cache Size \| Cache Hit Rate \| \|------------\|-------------------------------------\|----------------\| \|520 MB \| 0 MB \| 85.5% \| \|320 MB \| 400 MB \| 99.9% \| \|520 MB \| 400 MB \| 99.9% \| \|20 MB \| 500 MB \| 99.2% \| Reviewed By: anand1976 Differential Revision: D35117499 Pulled By: gitbw95 fbshipit-source-id: ea2657749fc13efebe91a8a1b56bc61d6a224a12	3 years ago
anand76	78556c14dd	Secondary cache error injection (#9002 ) Summary: Implement secondary cache error injection in db_stress. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9002 Reviewed By: zhichao-cao Differential Revision: D31874896 Pulled By: anand1976 fbshipit-source-id: 8cf04c061a4a44efa0fe88423d05cade67b85f73	3 years ago

4 Commits (6ce782beaf2ee6c1cc23787fcf72e5cbcaea7163)