Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2485
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GitHub user guozhangwang opened a pull request:
https://github.com/apache/kafka/pull/2485
KAFKA-3896: Fix KStream-KStream leftJoin
The issue of transiently having duplicates is due to the bad design of the
left join itself: in order to ignore the partial joined results such as
`A:n
