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https://issues.apache.org/jira/browse/MAPREDUCE-4824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated MAPREDUCE-4824:
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Attachment: MAPREDUCE-4824.patch
Rebased patch.
Tom, some changes for you to review:
# I've renamed the config to be mapreduce.job.recover.on.restart to be more
explicit/clear. We should use 'mapreduce' for new configs to avoid deprecations
in future.
# I've also introduced a static final MAPREDUCE_RECOVER_JOB variable in JobConf
to avoid using the actual config string by hand.
> 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
> Attachments: MAPREDUCE-4824.patch, MAPREDUCE-4824.patch,
> MAPREDUCE-4824.patch, MAPREDUCE-4824.patch, MAPREDUCE-4824.patch,
> MAPREDUCE-4824.patch, MAPREDUCE-4824.patch
>
>
> 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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