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https://issues.apache.org/jira/browse/HADOOP-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641786#action_12641786
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Amareshwari Sriramadasu commented on HADOOP-4305:
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bq. Can we count this only from successful jobs?
+1.
bq. If we adopt a proposal that if a TT fails consecutive tasks from N
different jobs, then the tasktracker is shutdown. Any successful execution of
any task from any job resets the counter associated with this tasktracker.
This involves a lot of book keeping at JobTracker, since counter should be
maintained for all the trackers. And every task completion and failure has to
update the counters.
> repeatedly blacklisted tasktrackers should get declared dead
> ------------------------------------------------------------
>
> Key: HADOOP-4305
> URL: https://issues.apache.org/jira/browse/HADOOP-4305
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Christian Kunz
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.20.0
>
>
> When running a batch of jobs it often happens that the same tasktrackers are
> blacklisted again and again. This can slow job execution considerably, in
> particular, when tasks fail because of timeout.
> It would make sense to no longer assign any tasks to such tasktrackers and to
> declare them dead.
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