Tom White created MAPREDUCE-4824:
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Summary: Provide a mechanism for jobs to indicate they should not
be recovered on restart
Key: MAPREDUCE-4824
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4824
Project: Hadoop Map/Reduce
Issue Type: New Feature
Components: mrv1
Affects Versions: 1.1.0
Reporter: Tom White
Assignee: Tom White
Some jobs (like Sqoop or HBase jobs) are not idempotent, so should not be
recovered on jobtracker restart. MAPREDUCE-2702 solves this problem for MR2,
however the approach there is not applicable for MR1, since even if we only use
the job-level part of the patch and add a isRecoverySupported method to
OutputCommitter, there is no way to use that information from the JT (which
initiates recovery), since the JT does not instantiate OutputCommitters - and
it shouldn't since they are user-level code. (In MR2 it's OK since the MR AM
calls the method.)
Instead, we can add a MR configuration property to say that a job is not
recoverable, and the JT could safely read this from the job conf.
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