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https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239958#comment-13239958
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Todd Lipcon commented on HDFS-2185:
-----------------------------------
Hi Sanjay. There is a state machine in the PDF I uploaded yesterday. Please see
section 2.6 of the latest attached PDF.
> 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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