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From "Igor Dvorzhak (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-15124) Slow FileSystem.Statistics counters
Date Sun, 17 Dec 2017 17:12:00 GMT
Igor Dvorzhak created HADOOP-15124:
--------------------------------------

             Summary: Slow FileSystem.Statistics counters 
                 Key: HADOOP-15124
                 URL: https://issues.apache.org/jira/browse/HADOOP-15124
             Project: Hadoop Common
          Issue Type: Bug
          Components: common
    Affects Versions: 3.0.0, 2.7.5, 2.8.3, 2.9.0
            Reporter: Igor Dvorzhak


While profiling 1TB TeraGen 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 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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