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Posted to issues@fluss.apache.org by "platinumhamburg (via GitHub)" <gi...@apache.org> on 2026/10/12 09:42:35 UTC

[PR] [kv] Use HyperClockCache for the shared RocksDB block cache [fluss]

platinumhamburg opened a new pull request, #4611:
URL: https://github.com/apache/fluss/pull/4611

   ### Purpose
   
   Closes #4610.
   
   When shared block caching is enabled, all KV tablets in a TabletServer currently use one LRU cache. Use RocksDB's HyperClockCache to reduce cache-metadata contention under concurrent access.
   
   ### Brief change log
   
   - Create the shared block cache with automatic entry-charge estimation, default sharding, and a non-strict capacity limit.
   - Exercise HCC in the existing two-database shared-cache test, including reads after one database closes.
   - Preserve existing capacity configuration, metrics, and ownership. Independent block caches and WriteBufferManager accounting remain LRU; no new configuration option is introduced.
   
   ### Tests
   
   - `./mvnw verify -pl fluss-server -am -Dtest=KvManagerTest,RocksDBResourceContainerTest -Dsurefire.failIfNoSpecifiedTests=false -DfailIfNoTests=false` (Java 11).
   - Workload-level performance comparisons have not been run; no throughput or latency improvement is claimed.
   
   ### API and Format
   
   No public API or storage-format changes.
   
   ### Documentation
   
   No new configuration or user-facing API.
   


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Re: [PR] [kv] Use HyperClockCache for the shared RocksDB block cache [fluss]

Posted by "platinumhamburg (via GitHub)" <gi...@apache.org>.
platinumhamburg merged PR #4611:
URL: https://github.com/apache/fluss/pull/4611


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