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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671821#comment-13671821
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Sanjay Radia commented on HADOOP-9517:
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bq. I vote to strengthen the compatibility requirements for user data file
formats. ... Rather we'd like to permit both writers or readers of data files
to be upgraded independently. ...
Agreed.
What do you mean by user data file formats? Do you mean data files that are
processed by libraries in user land (as opposed to a server). Would har
files, sequence files and RC files be such "user data file formats"? To ground
this better, Doug could you please give some examples of kinds of updates one
would want to do and of those which would be allowed and which would not.
> Document 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, hadoop-9517-proposal-v1.patch,
> hadoop-9517-proposal-v1.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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