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Posted to dev@kafka.apache.org by "Pedro Gontijo (Jira)" <ji...@apache.org> on 2020/09/17 06:23:00 UTC

[jira] [Created] (KAFKA-10493) Ktable out-of-order updates are not being ignored

Pedro Gontijo created KAFKA-10493:
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             Summary: 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, 2.3.0
            Reporter: Pedro Gontijo
         Attachments: KTableOutOfOrderBug.java

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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