Add support for DFS upgrade with HA enabled
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Key: HDFS-3133
URL: https://issues.apache.org/jira/browse/HDFS-3133
Project: Hadoop HDFS
Issue Type: Improvement
Components: ha, name-node
Affects Versions: 0.24.0
Reporter: Aaron T. Myers
For the first implementation of HA NameNode, we punted on allowing DFS upgrade
with HA enabled, which makes doing a DFS upgrade on an HA-enabled cluster quite
cumbersome and error-prone. We should add better support for this.
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