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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5630) NM fails to start after downgrade from 2.8 to 2.7
Date Fri, 09 Sep 2016 16:54:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477572#comment-15477572
] 

Arun Suresh commented on YARN-5630:
-----------------------------------

Like you mentioned in YARN-5633, maybe we should update the schema version only if the new
feature is used (only if {{storeContainerResourceChange}} method in the stateStore is called).
This means we should move the {{storeVersion}} method from the {{checkVersion}} to inside
the {{storeContainerResourceChange}} method.

> 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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