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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660806#comment-13660806
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Joep Rottinghuis commented on HADOOP-9517:
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"...but such changes are transparent to user application."
Is that only from the perspective of a user of a cluster before/after upgrade,
or also between different clusters ?
For example, how about being able to copy data from one cluster to another
(with different versions).
For example, the crc changes and distcp must be used with -skipcrccheck
Does compatibility mean that tools such as distcp can map from one format to
the other ?
> 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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