fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Hui Xiao 74cfe7db60 Refactor WriteBufferManager::CacheRep into CacheReservationManager (#8506) ... Summary: Context: To help cap various memory usage by a single limit of the block cache capacity, we charge the memory usage through inserting/releasing dummy entries in the block cache. CacheReservationManager is such a class (non thread-safe) responsible for inserting/removing dummy entries to reserve cache space for memory used by the class user. - Refactored the inner private class CacheRep of WriteBufferManager into public CacheReservationManager class for reusability such as for https://github.com/facebook/rocksdb/pull/8428 - Encapsulated implementation details of cache key generation and dummy entries insertion/release in cache reservation as discussed in https://github.com/facebook/rocksdb/pull/8506#discussion_r666550838 - Consolidated increase/decrease cache reservation into one API - UpdateCacheReservation. - Adjusted the previous dummy entry release algorithm in decreasing cache reservation to be loop-releasing dummy entries to stay symmetric to dummy entry insertion algorithm - Made the previous dummy entry release algorithm in delayed decrease mode more aggressive for better decreasing cache reservation when memory used is less likely to increase back. Previously, the algorithms only release 1 dummy entries when new_mem_used < 3/4 * cache_allocated_size_ and cache_allocated_size_ - kSizeDummyEntry > new_mem_used. Now, the algorithms loop-releases as many dummy entries as possible when new_mem_used < 3/4 * cache_allocated_size_. - Updated WriteBufferManager's test cases to adapt to changes on the release algorithm mentioned above and left comment for some test cases for clarity - Replaced the previous cache key prefix generation (utilizing object address related to the cache client) with one that utilizes Cache->NewID() to prevent cache-key collision among dummy entry clients sharing the same cache. The specific collision we are preventing happens when the object address is reused for a new cache-key prefix while the old cache-key using that same object address in its prefix still exists in the cache. This could happen due to that, under LRU cache policy, there is a possible delay in releasing a cache entry after the cache client object owning that cache entry get deallocated. In this case, the object address related to the cache client object can get reused for other client object to generate a new cache-key prefix. This prefix generation can be made obsolete after Peter's unification of all the code generating cache key, mentioned in https://github.com/facebook/rocksdb/pull/8506#discussion_r667265255 Pull Request resolved: https://github.com/facebook/rocksdb/pull/8506 Test Plan: - Passing the added unit tests cache_reservation_manager_test.cc - Passing existing and adjusted write_buffer_manager_test.cc Reviewed By: ajkr Differential Revision: D29644135 Pulled By: hx235 fbshipit-source-id: 0fc93fbfe4a40bb41be85c314f8f2bafa8b741f7		3 years ago
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cache.cc	Make SecondaryCache Customizable (#8480)	3 years ago
cache_bench.cc	Allow cache_bench/db_bench to use a custom secondary cache (#8312)	3 years ago
cache_bench_tool.cc	Make SecondaryCache Customizable (#8480)	3 years ago
cache_entry_roles.cc	Use deleters to label cache entries and collect stats (#8297)	3 years ago
cache_entry_roles.h	Clarify some DB::Open,OpenForReadOnly semantics (#8379)	3 years ago
cache_entry_stats.h	Don't hold DB mutex for block cache entry stat scans (#8538)	3 years ago
cache_helpers.h	Use deleters to label cache entries and collect stats (#8297)	3 years ago
cache_reservation_manager.cc	Refactor WriteBufferManager::CacheRep into CacheReservationManager (#8506)	3 years ago
cache_reservation_manager.h	Refactor WriteBufferManager::CacheRep into CacheReservationManager (#8506)	3 years ago
cache_reservation_manager_test.cc	Refactor WriteBufferManager::CacheRep into CacheReservationManager (#8506)	3 years ago
cache_test.cc	Use deleters to label cache entries and collect stats (#8297)	3 years ago
clock_cache.cc	Add a stat to count secondary cache hits (#8666)	3 years ago
clock_cache.h	Change RocksDB License	7 years ago
lru_cache.cc	Add a PerfContext counter for secondary cache hits (#8685)	3 years ago
lru_cache.h	Add a stat to count secondary cache hits (#8666)	3 years ago
lru_cache_test.cc	Add a PerfContext counter for secondary cache hits (#8685)	3 years ago
sharded_cache.cc	Add a stat to count secondary cache hits (#8666)	3 years ago
sharded_cache.h	Add a stat to count secondary cache hits (#8666)	3 years ago