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https://issues.apache.org/jira/browse/KAFKA-10493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-10493.
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Fix Version/s: (was: 4.0.0)
Assignee: (was: Matthias J. Sax)
Resolution: Won't Fix
> KTable out-of-order updates are not being ignored
> -------------------------------------------------
>
> Key: KAFKA-10493
> URL: https://issues.apache.org/jira/browse/KAFKA-10493
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.6.0
> Reporter: Pedro Gontijo
> Priority: Blocker
> Attachments: KTableOutOfOrderBug.java, out-of-order-table.png
>
>
> On a materialized KTable, out-of-order records for a given key (records which
> timestamp are older than the current value in store) are not being ignored
> but used to update the local store value and also being forwarded.
> I believe the bug is here:
> [https://github.com/apache/kafka/blob/2.6.0/streams/src/main/java/org/apache/kafka/streams/state/internals/ValueAndTimestampSerializer.java#L77]
> It should return true, not false (see javadoc)
> The bug impacts here:
> [https://github.com/apache/kafka/blob/2.6.0/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KTableSource.java#L142-L148]
> I have attached a simple stream app that shows the issue happening.
> Thank you!
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