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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: ZK-based FailoverController
Date Wed, 21 Dec 2011 09:21:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173966#comment-13173966
] 

Uma Maheswara Rao G commented on HDFS-2185:
-------------------------------------------

Hi Todd,

 Small question before going through the proposal in detail.
 
   I think Zookeeper already has in-built "leader election recipe" implementations ready right.
Are we going to reuse that implementations? 
Seems to me that, we are trying to implement the leader election again here. 

 Couple of JIRAs from Zookeeper: ZOOKEEPER-1209, ZOOKEEPER-1095, ZOOKEEPER-1080

Thanks
Uma
                
> 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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