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Date: Fri, 31 Oct 2008 04:05:44 -0700 (PDT)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4305) repeatedly blacklisted tasktrackers
 should get declared dead
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    [ https://issues.apache.org/jira/browse/HADOOP-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644263#action_12644263 ] 

Steve Loughran commented on HADOOP-4305:
----------------------------------------

I'd be happiest if there was some way of reporting this to some policy component that made the right decision. Because the action you take on a managed-VM cluster is different from hadoop on physical. On physical, you blacklist and maybe trigger a reboot. Or you start running well-known health tasks to see which parts of the system appear healthy. On a VM cluster you just delete that node and create a new one -no need to faff around with the state of the VM if it is a task-only VM; if its also a datanode you have to decommission it first.

> 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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