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https://issues.apache.org/jira/browse/KAFKA-20000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18045612#comment-18045612
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Chia-Ping Tsai commented on KAFKA-20000:
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The simple improvement is to modify TxnOffsetCommitHandler in
TransactionManager.java. When receiving CONCURRENT_TRANSACTIONS, override the
default retryBackoffMs with a smaller fixed value (e.g., 20ms) to expedite
retries, similar to the existing logic in AddPartitionsToTxnHandler
> Optimize retry backoff for CONCURRENT_TRANSACTIONS to improve TV2 throughput
> ----------------------------------------------------------------------------
>
> Key: KAFKA-20000
> URL: https://issues.apache.org/jira/browse/KAFKA-20000
> Project: Kafka
> Issue Type: Improvement
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Major
>
> Transaction V2 introduces frequent state transitions (epoch bumps) that
> briefly reject concurrent requests with CONCURRENT_TRANSACTIONS. The default
> client retry backoff (100ms) is excessive for these transient locks, leading
> to unnecessary latency and degraded throughput. Reducing the backoff allows
> faster retries and smoother performance during state transitions.
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