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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3769) KStream job spending 60% of time writing metrics
Date Fri, 10 Jun 2016 19:39:21 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325148#comment-15325148
] 

ASF GitHub Bot commented on KAFKA-3769:
---------------------------------------

GitHub user guozhangwang opened a pull request:

    https://github.com/apache/kafka/pull/1490

    KAFKA-3769: Optimize metrics recording overhead

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/guozhangwang/kafka K3769-optimize-metrics

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/1490.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1490
    
----
commit 68c889e1cba59280e4c1a37007efcdec6c784878
Author: Guozhang Wang <wangguoz@gmail.com>
Date:   2016-06-10T17:50:29Z

    reduce time.milliseconds

commit ad5403c919fe6ee9e5c5e7e3d9c9f2534a5a3717
Author: Guozhang Wang <wangguoz@gmail.com>
Date:   2016-06-10T19:38:05Z

    use milliseconds instead of nanoseconds for state store metrics

----


> KStream job spending 60% of time writing metrics
> ------------------------------------------------
>
>                 Key: KAFKA-3769
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3769
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.0.0
>            Reporter: Greg Fodor
>            Assignee: Guozhang Wang
>            Priority: Critical
>
> I've been profiling a complex streams job, and found two major hotspots when writing
metrics, which take up about 60% of the CPU time of the job. (!) A PR is attached.



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