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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8163) Improve ActiveStandbyElector to provide hooks for fencing old active
Date Mon, 12 Mar 2012 23:20:37 GMT
Improve ActiveStandbyElector to provide hooks for fencing old active
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                 Key: HADOOP-8163
                 URL: https://issues.apache.org/jira/browse/HADOOP-8163
             Project: Hadoop Common
          Issue Type: Improvement
          Components: ha
    Affects Versions: 0.24.0, 0.23.3
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


When a new node becomes active in an HA setup, it may sometimes have to take fencing actions
against the node that was formerly active. This JIRA extends the ActiveStandbyElector which
adds an extra non-ephemeral node into the ZK directory, which acts as a second copy of the
active node's information. Then, if the active loses its ZK session, the next active to be
elected may easily locate the unfenced node to take the appropriate actions.

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