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https://issues.apache.org/jira/browse/KAFKA-6567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691234#comment-16691234
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Guozhang Wang commented on KAFKA-6567:
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PR available here: https://github.com/apache/kafka/pull/5922/files
> KStreamWindowReduce can be replaced by KStreamWindowAggregate
> -------------------------------------------------------------
>
> Key: KAFKA-6567
> URL: https://issues.apache.org/jira/browse/KAFKA-6567
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Yaswanth Kumar
> Priority: Major
> Labels: newbie
>
> This is a tech debt worth cleaning up: KStreamWindowReduce should be able to
> be replaced by KStreamWindowAggregate. In fact, we have already done this for
> session windows, where in {{SessionWindowedKStreamImpl}} we use
> {{reduceInitializer}}, {{aggregatorForReducer}} and {{mergerForAggregator}}
> to replace reducer with aggregator.
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