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From "Eli Collins (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2679) Add interface to query current state to HAServiceProtocol
Date Wed, 14 Dec 2011 07:08:30 GMT
Add interface to query current state to HAServiceProtocol 
----------------------------------------------------------

                 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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