Igor Dvorzhak created HADOOP-15124:
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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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