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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6082) Elegant decommission of lighty loaded tasktrackers from a map-reduce cluster
Date Fri, 19 Jun 2009 06:09:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721669#action_12721669
] 

dhruba borthakur commented on HADOOP-6082:
------------------------------------------

Another option is to expose an APi from the JobTracker that  retrieves the status of all known
slave nodes and the load (#running maps, #running reduces) on that slave node. (This will
be equivalent to bin/hadoop dfsadmin -report command for HDFS).



> Elegant decommission of lighty loaded tasktrackers from a map-reduce cluster
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-6082
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6082
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: dhruba borthakur
>            Assignee: Namit Jain
>
> There is a need to elegantly move some machines from one map-reduce cluster to another.
This JIRA is to discuss how to find lightly loaded tasktrackers that are candidates for decommissioning
and then to elegantly decommission them by waiting for existing tasks to finish.

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