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https://issues.apache.org/jira/browse/HADOOP-8163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233638#comment-13233638
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Todd Lipcon commented on HADOOP-8163:
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Hi Hari. I like your ideas about using this info znode for failover/restart
preferences. But I don't think it's a requirement for a first draft, and it's
not clear what you mean by 'state equalization' in your second point. We don't
currently use this terminology.
Are you OK with the current design for a first draft? We can add improvements
later -- I'm using a protobuf for the info in ZK so we can evolve the
information contained within without breaking compatibility.
> Improve ActiveStandbyElector to provide hooks for fencing old active
> --------------------------------------------------------------------
>
> 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
> Attachments: hadoop-8163.txt
>
>
> 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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