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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4549) Distributed cache conflicts breaks backwards compatability
Date Thu, 16 Aug 2012 16:34:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436076#comment-13436076
] 

Alejandro Abdelnur commented on MAPREDUCE-4549:
-----------------------------------------------

Where was this discussed with the Oozie people? I'm not aware of this, I did not see any discussion
in the oozie-dev@ alias. 

Would you please summarize the issue, how it affects Oozie and what is exactly the impact
of leaving it incompatible in Hadoop 2?

At first look I think we should keep backwards compatibility in Hadoop 2. 

                
> Distributed cache conflicts breaks backwards compatability
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-4549
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4549
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.3
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Critical
>         Attachments: MR-4549-branch-0.23.txt
>
>
> I recently put in MAPREDUCE-4503 which went a bit too far, and broke backwards compatibility
with 1.0 in distribtued cache entries.  instead of changing the behavior of the distributed
cache to more closely match 1.0 behavior I want to just change the exception to a warning
message informing the users that it will become an error in 2.0

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