[PR] Introduce CMS_COMMIT stage for serialized commit handling [cassandra]

["beobal (via GitHub)" <gi...@apache.org>]

beobal opened a new pull request, #4891:
URL: https://github.com/apache/cassandra/pull/4891

   Add a dedicated single-threaded CMS_COMMIT stage to prevent INTERNAL_METADATA pool exhaustion under concurrent TCM_COMMIT_REQ load. Multiple threads entering AbstractLocalProcessor.commit() simultaneously amplify LWT retry pressure. Switching to a single commit thread eliminates that without reducing useful throughput since Paxos serializes the actual log write anyway.
   
   Patch by Jon Meredith; reviewed by Sam Tunnicliffe for CASSANDRA-21454
   
   


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Re: [PR] Introduce CMS_COMMIT stage for serialized commit handling [cassandra]

["beobal (via GitHub)" <gi...@apache.org>]

beobal closed pull request #4891: Introduce CMS_COMMIT stage for serialized commit handling
URL: https://github.com/apache/cassandra/pull/4891


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