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https://issues.apache.org/jira/browse/FLINK-9687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539580#comment-16539580
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ASF GitHub Bot commented on FLINK-9687:
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Github user Aitozi commented on the issue:
https://github.com/apache/flink/pull/6224
Aha, I meat to improve the performance of windowOperator, In the scenario
mentioned in the issue, this PR can avoid that bug, lucky hit ;-)
> Delay the state fetch only when the triggerResult is fire
> ---------------------------------------------------------
>
> Key: FLINK-9687
> URL: https://issues.apache.org/jira/browse/FLINK-9687
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.5.0
> Reporter: aitozi
> Assignee: aitozi
> Priority: Major
> Labels: pull-request-available
>
> When the window operator is fired by the event timer or processing timer, it
> fetch the state content first. I think it only need to fetch the content from
> windowState when the triggerResult is Fire. So we have to change the order to
> avoid this cost ( the cost of fetch content from state is more than judge the
> triggerResult).
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