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    Details

    • Type: Sub-task
    • Status: Patch Available
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 2.9.0, 2.8.3, 2.7.5, 3.0.0, 3.1.0
    • Fix Version/s: None
    • Component/s: common
    • Target Version/s:

      Description

      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.

        Attachments

        1. HADOOP-15124.001.patch
          37 kB
          Igor Dvorzhak

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              • Assignee:
                medb Igor Dvorzhak
                Reporter:
                medb Igor Dvorzhak
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                • Created:
                  Updated: