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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: ZK-based FailoverController
Date Mon, 22 Aug 2011 14:58:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088746#comment-13088746
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Uma Maheswara Rao G commented on HDFS-2185:
-------------------------------------------

Hi Eli,

 Are you planning to post the design document for this?

Small question.
 {quote}
 •Performs health monitoring (aka failure detection)
{quote}

   Here, do we need separate monitoring logic? As I know, ZK client watchers can give the
call backs if we register the watchers rite?
   (or) you are planning something alternative here?

If you post the design doc, it would be great. 

-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
>            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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