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Posted to dev@kafka.apache.org by "Guozhang Wang (JIRA)" <ji...@apache.org> on 2018/05/01 15:03:00 UTC

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

     [ https://issues.apache.org/jira/browse/KAFKA-6826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-6826.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

> 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
>             Fix For: 2.0.0
>
>         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)
>  !Screen Shot 2018-04-25 at 11.14.25 AM.png|width=797!



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