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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8928) Add ability to reset topologies on master nodes
Date Mon, 26 Nov 2012 12:38:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503760#comment-13503760
] 

Steve Loughran commented on HADOOP-8928:
----------------------------------------

Other implementations my be caching; the property topology handler definitely needs to support
reset too, so that it can read in its properties from a file again.

                
> Add ability to reset topologies on master nodes
> -----------------------------------------------
>
>                 Key: HADOOP-8928
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8928
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: net
>    Affects Versions: 3.0.0, 2.0.2-alpha
>            Reporter: Shinichi Yamashita
>         Attachments: HADOOP-8928.txt
>
>
> For a topology decision of DataNode and TaskTracker, ScriptBasedMapping (probably TableMapping)
confirms HashMap first.
> To decide topology of DataNode and TaskTracker again, it is necessary to restart NameNode
and JobTracker.
> Therefore, it is necessary to change (or clear) HashMap function without restarting NameNode
and JobTracker.

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