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https://issues.apache.org/jira/browse/HADOOP-4651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647223#action_12647223
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Amar Kamat commented on HADOOP-4651:
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Note that the resolution happens only when a new tracker joins hence this
should not be a big hit but its a bug.
> JobTracker.addNewTracker() unnecessarily resolves already resolved nodes
> ------------------------------------------------------------------------
>
> 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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