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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: ZK-based FailoverController
Date Wed, 21 Dec 2011 17:35:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174246#comment-13174246
] 

Todd Lipcon commented on HDFS-2185:
-----------------------------------

Yea, this is very similar to the leader election recipe - I planned to base the code somewhat
on that code for best practices. But the major difference is that we need to do fencing as
well, which requires that we leave a non-ephemeral node behind when our ephemeral node expires,
so the new NN can fence the old.
                
> HA: ZK-based FailoverController
> -------------------------------
>
>                 Key: HDFS-2185
>                 URL: https://issues.apache.org/jira/browse/HDFS-2185
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>
> 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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