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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5630) NM fails to start after downgrade from 2.8 to 2.7
Date Mon, 12 Sep 2016 15:53:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15484465#comment-15484465

Jason Lowe commented on YARN-5630:

Thanks for the +1, Arun!  I'll commit this later today if there are no objections.

Regarding the key removal, yes if we read the keys out of the store itself then that totally
makes sense.  Actually I was assuming that during the rollback when the old software saw a
key that was ignored it would just remove it as it iterated the database.  I suppose we could
have the entry flag whether or not the ignored key should be preserved as long as the container
is active in case there is a subsequent roll-forward.  Then there's no need for a prepare-for-rollback
once the support for the key table is in the old software version and all we need to do is
delete keys.  Of course if there's more to do than just delete keys or fail containers then
something needs to be run on the new software before downgrading to the old one.

> NM fails to start after downgrade from 2.8 to 2.7
> -------------------------------------------------
>                 Key: YARN-5630
>                 URL: https://issues.apache.org/jira/browse/YARN-5630
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>         Attachments: YARN-5630.001.patch, YARN-5630.002.patch
> A downgrade from 2.8 to 2.7 causes nodemanagers to fail to start due to an unrecognized
"version" container key on startup.  This breaks downgrades from 2.8 to 2.7.

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