Move DatanodeInfo#hostName to DatanodeID
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Key: HDFS-3164
URL: https://issues.apache.org/jira/browse/HDFS-3164
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Eli Collins
Assignee: Eli Collins
Like HDFS-3138 (the ipcPort) the hostName field in DatanodeInfo is not
ephemeral and should be in DatanodeID. This also allows us to fixup the issue
where the DatanodeID#name field is overloaded (the DN sets it to a hostname,
then the NN clobbers it with an IP, and then the DN clobbers it's hostname
field with this IP). If the DN can specify both a "name" and "hostname" in the
DatanodeID then this code becomes simpler.
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