Add interface to query current state to HAServiceProtocol
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Key: HDFS-2679
URL: https://issues.apache.org/jira/browse/HDFS-2679
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: HA branch (HDFS-1623)
Reporter: Eli Collins
Assignee: Eli Collins
Let's add an interface to HAServiceProtocol to query the current state of a
NameNode for use by the the CLI (HAAdmin) and Web UI (HDFS-2677). This
essentially makes the names "active" and "standby" from ACTIVE_STATE and
STANDBY_STATE public interfaces, which IMO seems reasonable. Unlike the other
APIs we should be able to use the interface even when HA is not enabled (as by
default a non-HA NN is active).
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