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https://issues.apache.org/jira/browse/HADOOP-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703821#action_12703821
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Amar Kamat commented on HADOOP-5643:
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Also added a new parameter {{mapred.permissions.supergroup}} to allow admins
specify supergroups. Either the user running the jobtracker or user in the
supergroup can issue admin commands.
> Ability to blacklist tasktracker
> --------------------------------
>
> Key: HADOOP-5643
> URL: https://issues.apache.org/jira/browse/HADOOP-5643
> Project: Hadoop Core
> Issue Type: New Feature
> Affects Versions: 0.20.0
> Reporter: Rajiv Chittajallu
> Assignee: Amar Kamat
> Attachments: HADOOP-5643-v3.4.patch
>
>
> Its not always possible to shutdown the tasktracker to stop scheduling tasks
> on the node. (eg you can't login to the node but the TT is up).
> This can be via
> * mapred.exclude and should be refreshed with out restarting the tasktracker
> * hadoop job -fail-tracker <tracker id>
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