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Date: Fri, 22 Jul 2011 07:24:58 +0000 (UTC)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-2185) HA: ZK-based FailoverController
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HA: ZK-based FailoverController
-------------------------------

                 Key: HDFS-2185
                 URL: https://issues.apache.org/jira/browse/HDFS-2185
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Eli Collins
            Assignee: Eli Collins


This jira is for a ZK-based FailoverController daemon. The FailoverController is a separate daemon from the NN that does the following:
* Initiates leader election (via ZK) when necessary
* Performs health monitoring (aka failure detection)
* Performs fail-over (standby to active and active to standby transitions)
* Heartbeats to ensure the liveness

It should have the same/similar interface as the Linux HA RM to aid pluggability.

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