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https://issues.apache.org/jira/browse/HADOOP-5643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703482#action_12703482
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eric baldeschwieler commented on HADOOP-5643:
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Do we have a good security story for actions taken through the web UI? Absent
that, I'd suggest we don't enable this there.
Being able to modify the excludes file and hup the server is probably good
enough for an operator.
> 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
>
> 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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