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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-128) Resurrect RM Restart
Date Tue, 25 Sep 2012 15:07:10 GMT

    [ https://issues.apache.org/jira/browse/YARN-128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462832#comment-13462832
] 

Robert Joseph Evans commented on YARN-128:
------------------------------------------

The problem is that we cannot be truly backwards compatible when adding in this feature. 
We have to better define the lifecycle of an AM for it to be "well behaved" and properly handle
RM recovery.  I would say that if the client asks the AM to stop it should still pause on
unregister until it can successfully unregister, or until it can mark itself as "killed" in
a persistent way like with the job history log, so that when that AM is relaunched all it
has to do is to check a file on HDFS and then unregister.  Perhaps the only way to be totally
backwards compatible is for the AM to indicate when it registers if it supports RM recovery
or not.  Or to avoid any race conditions when the client launches the AM it would indicate
this.  If it does not (legacy AMs), then the RM will not try to relaunch it if the AM goes
down while the RM is recovering.  If it does, then the AM will always be relaunched when the
RM goes down. 
                
> Resurrect RM Restart 
> ---------------------
>
>                 Key: YARN-128
>                 URL: https://issues.apache.org/jira/browse/YARN-128
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.0.0-alpha
>            Reporter: Arun C Murthy
>            Assignee: Bikas Saha
>         Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.

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