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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-230) Make changes for RM restart phase 1
Date Wed, 28 Nov 2012 12:48:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505427#comment-13505427
] 

Tom White commented on YARN-230:
--------------------------------

bq. But it could make sense to remove application attempts but not remove the application,
couldn't it? Say we want to remove some attempt from the saved state before the application
is done.

Let's add it when we need it then.

bq. We also need to change the AM retry default to > 1. Otherwise, even with RM restart
enabled, the restarted attempts will fail because the previous AM will delete job files. What
is your suggestion for that?

I think this is where the killed/failed distinction comes in. If the app attempt was killed
(because the RM died), then the app will be retried since the first attempt didn't count (from
the point of view of yarn.resourcemanager.am.max-retries). This should be taken care of in
YARN-218 - does that sound OK to you?
                
> Make changes for RM restart phase 1
> -----------------------------------
>
>                 Key: YARN-230
>                 URL: https://issues.apache.org/jira/browse/YARN-230
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>         Attachments: PB-impl.patch, Recovery.patch, Store.patch, Test.patch, YARN-230.1.patch
>
>
> As described in YARN-128, phase 1 of RM restart puts in place mechanisms to save application
state and read them back after restart. Upon restart, the NM's are asked to reboot and the
previously running AM's are restarted.
> After this is done, RM HA and work preserving restart can continue in parallel. For more
details please refer to the design document in YARN-128

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