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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: ZK-based FailoverController
Date Fri, 05 Aug 2011 00:20:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079700#comment-13079700
] 

Aaron T. Myers commented on HDFS-2185:
--------------------------------------

Hey Florian, I don't think anyone would disagree with you that Pacemaker already provides
much of this functionality. The design document in HDFS-1623 discusses both using Pacemaker
or a Hadoop-specific failover controller. The intention of HDFS-1623 is absolutely to provide
the necessary hooks to be able to support either one.

> HA: ZK-based FailoverController
> -------------------------------
>
>                 Key: HDFS-2185
>                 URL: https://issues.apache.org/jira/browse/HDFS-2185
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>
> 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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