[ https://issues.apache.org/jira/browse/HADOOP-15124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated HADOOP-15124:
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Target Version/s: 2.10.0, 3.2.0, 3.0.4, 2.8.6, 2.9.3, 3.1.3 (was: 2.10.0, 3.2.0, 3.0.4,
3.1.2, 2.8.6, 2.9.3)
> 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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