Shinichi Yamashita created HADOOP-8928:
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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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