Guozhang Wang updated KAFKA-4153:
    Assignee: Elias Levy  (was: Guozhang Wang)

> Incorrect KStream-KStream join behavior with asymmetric time window
> -------------------------------------------------------------------
>                 Key: KAFKA-4153
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4153
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions:
>            Reporter: Elias Levy
>            Assignee: Elias Levy
>             Fix For:
> Using Kafka, if joining records in two streams separated by some 
> time, but only when records from one stream are newer than records from the 
> other, i.e. doing:
> {{stream1.join(stream2, valueJoiner, JoinWindows.of("X").after(10000))}}
> One would expect that the following would be equivalent:
> {{stream2.join(stream1, valueJoiner, JoinWindows.of("X").before(10000))}}
> Alas, that this is not the case.  Instead, this generates the same output as 
> the first example:
> {{stream2.join(stream1, valueJoiner, JoinWindows.of("X").after(10000))}}
> The problem is that the 
> [{{DefaultJoin}}|https://github.com/apache/kafka/blob/caa9bd0fcd2fab4758791408e2b145532153910e/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamImpl.java#L692-L697]
>  implementation in {{KStreamImpl}} fails to reverse the {{before}} and 
> {{after}} values when creates the {{KStreamKStreamJoin}} for the other 
> stream, even though is calls {{reverseJoiner}} to reverse the joiner.

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