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From "Bikas Saha (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: HDFS portion of ZK-based FailoverController
Date Tue, 03 Apr 2012 21:08:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245739#comment-13245739
] 

Bikas Saha commented on HDFS-2185:
----------------------------------

I think you are missing the failure arc when transitionToStandby is called in InElection state.

Is there any scope for admin operations in ZKFC. Will ZKFC receive and accept a signal (manual
admin/auto machine reboot) to stop services? At that point, in InElection state, how will
it know that it needs to send transitionToStandby or not (based on whether it is active or
not)?

                
> 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: auto-failover, ha
>    Affects Versions: 0.24.0, 0.23.3
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>             Fix For: Auto failover (HDFS-3042)
>
>         Attachments: Failover_Controller.jpg, hdfs-2185.txt, hdfs-2185.txt, hdfs-2185.txt,
hdfs-2185.txt, hdfs-2185.txt, zkfc-design.pdf, 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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