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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4305) repeatedly blacklisted tasktrackers should get declared dead
Date Tue, 30 Sep 2008 01:15:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635623#action_12635623
] 

dhruba borthakur commented on HADOOP-4305:
------------------------------------------

+1. I have seen that scenario occur a lot in our cluster. Some details in HADOOP-2676.

> 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
>
> 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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