Junping Du created MAPREDUCE-6478:
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Summary: Add an option to skip cleanupJob stage or ignore cleanup
failure during commitJob().
Key: MAPREDUCE-6478
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6478
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Junping Du
Assignee: Junping Du
In some our test cases for MR on public cloud scenario, a very big MR job with
hundreds or thousands of reducers cannot finish successfully because of Job
Cleanup failures which is caused by different scale/performance impact for File
System on the cloud (like AzureFS) which replacing HDFS's deletion for whole
directory with REST API calls on deleting each sub-directories recursively.
That could take much longer time (hours) which is not necessary in public cloud
scenario.
Also, it also more easily to get failed to cleanup in these cases, so some
failures of cleanupJob can be ignored in this case. Making whole job finish
successfully with side effect of wasting some user spaces make more sense in
these cases as user's job is usually comes and goes in public cloud, so have a
trade off to tolerant some temporary files exists with get rid of big job
re-run is quite cost effective.
We should allow user to have this option (ignore failure or skip job cleanup
stage completely) especially when user know the cleanup failure is not due to
HDFS abnormal status but other FS' different performance trade-off.
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