[jira] [Commented] (HADOOP-15124) Slow FileSystem.Statistics counters implementation

["Erik Krogen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-15124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16645436#comment-16645436 ] 

Erik Krogen commented on HADOOP-15124:
--------------------------------------

Hi [~medb], [~stevel@apache.org], are the two of you still planning to push forward this work? We may be interested in helping as well. Please let me know, thanks.

> Slow FileSystem.Statistics counters implementation
> --------------------------------------------------
>
>                 Key: HADOOP-15124
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15124
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: common
>    Affects Versions: 2.9.0, 2.8.3, 2.7.5, 3.0.0, 3.1.0
>            Reporter: Igor Dvorzhak
>            Assignee: Igor Dvorzhak
>            Priority: Major
>              Labels: common, filesystem, fs, statistics
>         Attachments: HADOOP-15124.001.patch
>
>
> While profiling 1TB TeraGen job on Hadoop 2.8.2 cluster (Google Dataproc, 2 workers, GCS connector) I saw that FileSystem.Statistics code paths Wall time is 5.58% and CPU time is 26.5% of total execution time.
> After switching FileSystem.Statistics implementation to LongAdder, consumed Wall time decreased to 0.006% and CPU time to 0.104% of total execution time.
> Total job runtime decreased from 66 mins to 61 mins.
> These results are not conclusive, because I didn't benchmark multiple times to average results, but regardless of performance gains switching to LongAdder simplifies code and reduces its complexity.



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