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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