allow outputcommitters to skip setup/cleanup
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Key: MAPREDUCE-1802
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1802
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Joydeep Sen Sarma
Assignee: Joydeep Sen Sarma
Job setup and cleanup overheads in our (larger) clusters are very significant and add to latency
for small jobs. It turns out that Hive does not require job setup and cleanup at all - since
all management of output/temporary files and such is done by the hive client side. So it would
be a big win for our environment (and Hive users in general) if we could skip job cleanup/setup
altogether.
The proposal is to add new calls to OutputCommitter interface (along the lines of needsTaskCommit())
to optionally allow skipping of setup/cleanup and for the JT to take these into account while
scheduling setup/cleanup. NullOutputFormat should not need setup/cleanup for example.
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