HA: Introduce active and standby states to the namenode
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Key: HDFS-1974
URL: https://issues.apache.org/jira/browse/HDFS-1974
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Environment: Currently namenode supports active, secondary and backup
roles. To support namenode high availability, active and standby states are
needed. Note that this is different from the existing notion of namenode role,
where a namenode cannot transition from one role to the other.
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
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