JournalProtocol changes required for introducing epoch and fencing
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Key: HDFS-3211
URL: https://issues.apache.org/jira/browse/HDFS-3211
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Reporter: Suresh Srinivas
JournalProtocol changes to introduce epoch in every request. Adding new method
fence for fencing a JournalService. On BackupNode fence is a no-op.
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