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liang xie commented on HADOOP-8928: ----------------------------------- IMHO, add the clear method to CachedDNSToSwitchMapping is enough, since only *cache* class need to be clear, right? I'll give a quick patch per Shinichi's design > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira