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From "Sanjay Radia (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: HDFS portion of ZK-based FailoverController
Date Tue, 27 Mar 2012 21:10:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239954#comment-13239954
] 

Sanjay Radia commented on HDFS-2185:
------------------------------------

Todd, I am even okay with a scanned diagram of hand drawn state machine. Right now I can't
get a full understanding of the design without more details.
                
> HA: HDFS portion of 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: 0.24.0, 0.23.3
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>         Attachments: Failover_Controller.jpg, hdfs-2185.txt, hdfs-2185.txt, hdfs-2185.txt,
hdfs-2185.txt, zkfc-design.pdf, zkfc-design.pdf, zkfc-design.tex
>
>
> 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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