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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8928) Add ability to reset topologies on master nodes
Date Mon, 15 Oct 2012 09:44:03 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-8928:
-----------------------------------

    Summary: Add ability to reset topologies on master nodes  (was: Add cache data change
function to CachedDNSToSwitchMapping)

Renaming the title to emphasise that it is covers more than just the CachedDNSToSwitchMapping
                
> 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
>            Reporter: Shinichi Yamashita
>
> 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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