Jungtaek Lim created MAPREDUCE-7317:
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Summary: add-latency-info-in-mergepath-in-file-committer-ver1
Key: MAPREDUCE-7317
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7317
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: client
Reporter: Jungtaek Lim
We have been observed some occurrences of huge delay from file output committer
V1, where file output committer V2 is not an option.
While the root cause should have investigated on our side, there's another
issue that there's insufficient information to debug. Most likely the huge
delay comes from mergePaths, but the class only provides the "debug" log
message to log the call itself with parameters, nothing else. mergePaths has
been called recursively which is harder to trace how much latency specific
directory takes to merge.
It would be nice and not intrusive to add latency info in mergePath, so that we
can see how much latency specific directory takes to merge, only when debug log
is enabled.
(Ideally it'd be nice if we can log warn message when the call takes huge time
to process, but I don't have the proper threshold for the "huge time", so I'd
avoid dealing with it altogether here.)
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