Todd Lipcon created HDFS-3796:
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Summary: Speed up edit log tests by avoiding fsync()
Key: HDFS-3796
URL: https://issues.apache.org/jira/browse/HDFS-3796
Project: Hadoop HDFS
Issue Type: Improvement
Components: test
Affects Versions: 3.0.0, 2.2.0-alpha
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Minor
Our edit log tests are very slow because they incur a lot of fsyncs as they
write out transactions. Since fsync() has no effect except in the case of power
outages or system crashes, and we don't care about power outages in the context
of tests, we can safely skip the fsync without any loss in coverage.
In my tests, this sped up TestEditLog by about 5x. The testFuzzSequences test
case improved from ~83 seconds with fsync to about 5 seconds without. These
results are from my SSD laptop - they are probably even more drastic on
spinning media.
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