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Posted to jira@kafka.apache.org by "il-kyun (via GitHub)" <gi...@apache.org> on 2026/10/23 05:56:36 UTC

Re: [PR] KAFKA-21316: Reuse nodes in PartitionStates to avoid retaining removed entries [kafka]

il-kyun commented on PR #23839:
URL: https://github.com/apache/kafka/pull/23839#issuecomment-6358483994

   @chia7712 @junrao could you take a look when you have time? This fixes young GC slowdowns on follower brokers: PartitionStates leaves removed LinkedHashMap entries chained through next, and once one of them is promoted, every young GC copies the whole chain. The fix reuses the node instead of remove + put.
   
   I filed https://issues.apache.org/jira/browse/KAFKA-21316 and added it to the title. The Jira also has more test results: reproduction on three test clusters with and without the patch (longest chain 838-339,594 before, 2-4 after), wider regression runs, and production numbers.
   


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