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https://issues.apache.org/jira/browse/HADOOP-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620981#action_12620981
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dhruba borthakur commented on HADOOP-3245:
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I have seen that having a "safe-mode" kind of thing for the JobTracker is
really nice to have (maybe not as part of this patch). When safe-mode is
enabled, only commands from the adminsitrator are accepted. Many a times, when
I upgrade a cluster and restart the job-tracker, user's cron-scripts
immediately start submitting jobs to the tracker. Ideally, i would like the
administrator to submit a few validate-cluster-kinda jobs before I open the
cluster to general users.
> 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
>
>
> 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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