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From "Shinichi Yamashita (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8928) Add cache data change function to CachedDNSToSwitchMapping
Date Sun, 14 Oct 2012 15:05:02 GMT
Shinichi Yamashita created HADOOP-8928:

             Summary: Add cache data change function to CachedDNSToSwitchMapping
                 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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