Add metrics and web UI for cluster version summary
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Key: HDFS-3245
URL: https://issues.apache.org/jira/browse/HDFS-3245
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 2.0.0
Reporter: Todd Lipcon
With the introduction of protocol compatibility, once HDFS-2983 is committed,
we have the possibility that different nodes in a cluster are running different
software versions. To aid operators, we should add the ability to summarize the
status of versions in the cluster, so they can easily determine whether a
rolling upgrade is in progress or if some nodes "missed" an upgrade (eg maybe
they were out of service when the software was updated)
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