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https://issues.apache.org/jira/browse/KAFKA-14400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17636509#comment-17636509
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Victor van den Hoven commented on KAFKA-14400:
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I agree, but actually it is also happening with the ofTimeDifferenceAndGrace()
method.
As far as I can tell it has nothing to do with the grace period.
It just is not working correctly. Also Join() does seem to work, leftJoin()
isn't.
Maybe you can reproduce with.
> KStream - KStream - LeftJoin() does not call ValueJoiner with null value
> -------------------------------------------------------------------------
>
> Key: KAFKA-14400
> URL: https://issues.apache.org/jira/browse/KAFKA-14400
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.1.1, 3.3.1
> Environment: Windows PC
> Reporter: Victor van den Hoven
> Priority: Major
> Attachments: SimpleStreamTopology.java, SimpleStreamTopologyTest.java
>
>
> In Kafka-streams 3.1.1 :
> When using +JoinWindows.ofTimeDifferenceWithNoGrace(Duration.ofMillis(10000))+
> the KStream {*}leftJoin{*}(KStream otherStream, ValueJoiner {_}joiner{_},
> JoinWindows windows) does not seem to call the _joiner_ with null value when
> join predicate is not satisfied (not expected).
>
> When using deprecated +JoinWindows.of(Duration.ofMillis(10000));+
> the KStream {*}leftJoin{*}(KStream otherStream, ValueJoiner {_}joiner{_},
> JoinWindows windows) does
> call the _joiner_ with null value when join predicate is not satisfied (as
> expected and documented).
>
> Attached you can find two files with TopologyTestDriver Unit test to
> reproduce.
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