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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660965#comment-13660965
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Steve Loughran commented on HADOOP-9517:
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Karthik, -source tree compatibility

Yes, why I say {{patch}} I mean directory layout -we already have differences 
there between 1.x and 2.x; new changes are inevitable in future. Source code 
applicability can change and we must not make any promises there.

A policy here could be
minor versions:
# No planned changes in source tree layout, though it may happen
# Source files may be added, deleted and moved
# Source files may change so that patches no longer cleanly apply.

major versions: 
# all of the above
# a complete refactoring of the source tree, build and test toolings may happen.
                
> Define Hadoop Compatibility
> ---------------------------
>
>                 Key: HADOOP-9517
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9517
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Arun C Murthy
>            Assignee: Karthik Kambatla
>         Attachments: hadoop-9517.patch, hadoop-9517.patch, hadoop-9517.patch, 
> hadoop-9517.patch
>
>
> As we get ready to call hadoop-2 stable we need to better define 'Hadoop 
> Compatibility'.
> http://wiki.apache.org/hadoop/Compatibility is a start, let's document 
> requirements clearly and completely.

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