CalvinConfluent commented on code in PR #17698:
URL: https://github.com/apache/kafka/pull/17698#discussion_r1849322960
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core/src/main/scala/kafka/log/UnifiedLog.scala:
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@@ -629,10 +629,11 @@ class UnifiedLog(@volatile var logStartOffset: Long,
/**
* Return true if the given producer ID has a transaction ongoing.
+ * Note, if the incoming producer epoch is newer than the stored one, the
transaction may have finished.
Review Comment:
I think it is possible and we should reject it earlier. We can make a
separate PR for this optimization.
https://issues.apache.org/jira/browse/KAFKA-18042
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