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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2012/10/15 11:44:03 UTC

[jira] [Updated] (HADOOP-8928) Add ability to reset topologies on master nodes

     [ 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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