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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2020/12/22 02:53:00 UTC
[jira] [Assigned] (KAFKA-10847) Avoid spurious left/outer join
results in stream-stream join
[ https://issues.apache.org/jira/browse/KAFKA-10847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias J. Sax reassigned KAFKA-10847:
---------------------------------------
Assignee: Matthias J. Sax
> Avoid spurious left/outer join results in stream-stream join
> -------------------------------------------------------------
>
> Key: KAFKA-10847
> URL: https://issues.apache.org/jira/browse/KAFKA-10847
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Major
>
> KafkaStreams follows an eager execution model, ie, it never buffers input records but processes them right away. For left/outer stream-stream join, this implies that left/outer join result might be emitted before the window end (or window close) time is reached. Thus, a record what will be an inner-join result, might produce a eager (and spurious) left/outer join result.
> We should change the implementation of the join, to not emit eager left/outer join result, but instead delay the emission of such result after the window grace period passed.
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