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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (MAPREDUCE-4345) ZK-based High Availability (HA) for ResourceManager (RM)
Date Tue, 19 Jun 2012 04:53:43 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J reopened MAPREDUCE-4345:
--------------------------------


Thanks Bikas! Agree it is related to resurrecting RM restart.

Arun - It isn't a duplicate, at least the way I see it the MAPREDUCE-4326 targets a restart-recovery
while this one I'd opened to target proper HA (multiple RMs, failing over automatically, with
client code covered too). It is what may come after restart-ability is achieved. Thanks, I've
reopened it :)
                
> ZK-based High Availability (HA) for ResourceManager (RM)
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-4345
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4345
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Harsh J
>            Assignee: Bikas Saha
>
> One of the goals presented on MAPREDUCE-279 was to have high availability. One way that
was discussed, per Mahadev/others on https://issues.apache.org/jira/browse/MAPREDUCE-2648
and other places, was ZK:
> {quote}
> Am not sure, if you already know about the MR-279 branch (the next version of MR framework).
We've been trying to integrate ZK into the framework from the beginning. As for now, we are
just doing restart with ZK but soon we should have a HA soln with ZK.
> {quote}
> There is now MAPREDUCE-4343 that tracks recoverability via ZK. This JIRA is meant to
track HA via ZK.
> Currently there isn't a HA solution for RM, via ZK or otherwise.

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