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