Add rocksdb_block_cache_numshardbits for issue 1336 #1339
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This fixes facebook#1336 The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case.
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It is likely main.mysqld--help-notwin test needs a re-record
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Summary: This fixes #1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: #1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
luqun
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Aug 10, 2023
Summary: This fixes facebook#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
hermanlee
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Oct 3, 2023
Summary: This fixes facebook#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook#1339 Differential Revision: D47635762
hermanlee
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Oct 18, 2023
Summary: This fixes facebook#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook#1339 Differential Revision: D47635762
inikep
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Dec 20, 2023
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Dec 20, 2023
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Dec 21, 2023
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jan 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jan 17, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jan 17, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jan 17, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Feb 8, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Feb 9, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Feb 9, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Feb 12, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 12, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 12, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 12, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
oleksandr-kachan
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Apr 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Apr 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Apr 15, 2024
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Apr 16, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Apr 16, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Apr 16, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
percona-ysorokin
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Apr 18, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Apr 28, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Apr 30, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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May 4, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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May 4, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jun 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jun 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jun 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Jul 31, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
percona-ysorokin
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Jul 31, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Jul 31, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jul 31, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Jul 31, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
percona-ysorokin
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Aug 2, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Aug 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Oct 22, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
inikep
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Oct 27, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
dlenev
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Oct 30, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 4, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 4, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 5, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 6, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
dlenev
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Nov 7, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
lukin-oleksiy
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Nov 11, 2025
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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Jan 21, 2026
Upstream commit ID: facebook/mysql-5.6@730887a PS-8951: Merge percona-202305 (https://jira.percona.com/browse/PS-8951) Summary: This fixes facebook/mysql-5.6#1336 This adds the my.cnf options: rocksdb_block_cache_numshardbits This option can be set so that RocksDB to fix the number of block cache shards. The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper. The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case. Pull Request resolved: facebook/mysql-5.6#1339 Differential Revision: D47635762 fbshipit-source-id: 7ca759f9a001dbe1a20978ded5b614c209bd5b1f
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This fixes #1336
This adds the my.cnf options: rocksdb_block_cache_numshardbits
This option can be set so that RocksDB to fix the number of block cache shards.
The default value is -1 to match existing behavior. When -1 RocksDB code will determine the number of block cache shards as min(6, rocksdb_block_cache_size / min_shard_size) and today min_shard_size is 512K for LRU and 32M for Hyper.
The math above frequently results in a block cache with too many small shards when rocksdb_block_cache_size is not too big (a few GB is not too big) and there will be perf problems that are hard to debug in such a case.