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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662324#comment-13662324
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Sanjay Radia commented on HADOOP-9517:
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{quote}
>>> HDFS metadata and data can change across minor or major releases ....
... Do you think there is merit to adding a policy on such changes being
compatible within a major release - by compatible, we mean the compatibility
required to be able to run different versions (minor - e.g. 2.1 and 2.2) within
the same major release in the same cluster.
{quote}
My inclination is no. Updating metadata automatically during release upgrade
(minor or major) is fairly easy.
> 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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