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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13652128#comment-13652128
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Steve Loughran commented on HADOOP-9517:
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This looks pretty good - I like where you list out "no policy here" -which is
both a warning and a sign of where work may be needed at some point in the
future.
I'd flag on the {{Currently, there is NO policy on preserving data formats
across releases.}} as while that may be the case,; HDFS does have a policy of
handling migration from at least one major version behind. The format may
change, but the data will be preserved. Can you add that to avoid scaring
people?
> 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
>
>
> 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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