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https://issues.apache.org/jira/browse/HADOOP-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625826#action_12625826
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Pete Wyckoff commented on HADOOP-3245:
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bq. "safe-mode" that is automatically triggered when the namenode restarts. A
similar thing wold be very helpful for the JobTracker.
Also, it would be nice to stop the JT from taking new submissions so the
administrator can allow the running jobs to complete before upgrading the
cluster. Even though we can persist these jobs, if there's a big upgrade or
something else, the admin may want to drain all running jobs before stopping
the cluster.
> Provide ability to persist running jobs (extend HADOOP-1876)
> ------------------------------------------------------------
>
> Key: HADOOP-3245
> URL: https://issues.apache.org/jira/browse/HADOOP-3245
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Amar Kamat
> Attachments: HADOOP-3245-v2.5.patch, HADOOP-3245-v2.6.5.patch,
> HADOOP-3245-v2.6.9.patch, HADOOP-3245-v4.1.patch, HADOOP-3245-v5.13.patch,
> HADOOP-3245-v5.14.patch, HADOOP-3245-v5.26.patch
>
>
> This could probably extend the work done in HADOOP-1876. This feature can be
> applied for things like jobs being able to survive jobtracker restarts.
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