JobTracker.addNewTracker() unnecessarily resolves already resolved nodes
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Key: HADOOP-4651
URL: https://issues.apache.org/jira/browse/HADOOP-4651
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Amar Kamat
_hostnameToNodeMap_ maintains a map from _hostname_ to _resolved-address_.
{{JobTracker.addNewTracker()}} resolves a node's address if the node is not
present in _hostnameToNodeMap_ but uses _tracker-name_ to index into
_hostnameToNodeMap_ instead of _hostname_.
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