[jira] [Commented] (KAFKA-6826) Avoid range scans when forwarding values in window store aggregations

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-6826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452012#comment-16452012 ] 

ASF GitHub Bot commented on KAFKA-6826:
---------------------------------------

xvrl opened a new pull request #4927: KAFKA-6826 avoid range scans when forwarding values during aggregation
URL: https://github.com/apache/kafka/pull/4927
 
 
   @guozhangwang 

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> Avoid range scans when forwarding values in window store aggregations
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-6826
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6826
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Xavier Léauté
>            Assignee: Xavier Léauté
>            Priority: Critical
>         Attachments: Screen Shot 2018-04-25 at 11.14.25 AM.png
>
>
> This is a follow-up to KAFKA-6560, where we missed at least one case that should be using single point queries instead of range-scans when forwarding values during aggregation.
> Since a single range scan can sometimes account for 75% of aggregation cpu time, fixing this should provide some significant speedups (see attached flamegraph)



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