HA: Implement a simple NN health check
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Key: HDFS-3027
URL: https://issues.apache.org/jira/browse/HDFS-3027
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
This JIRA is to address a TODO in NameNode about actually implementing the
checkHealth RPC.
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