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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659836#comment-13659836
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Karthik Kambatla commented on HADOOP-9517:
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Thanks Sanjay. This is brilliant. Will update the patch to refer to the
HADOOP-7391. Also, it would be great to include that in the documentation (the
.apt.vm format) and check it in. Let me know if you want me to copy the same
and post an update patch to HADOOP-7391. Also, I ll update the patch to have a
section "Data Compatibility" with separate bullets for metadata and data
formats in place of current "Data format". Will include the weaker version for
the overall policy.
bq. Q. What is the audience for the document generated by this jira - the user
of Hadoop, the developer or both?
The audience for the documentation is both users and developers of Hadoop:
# For the users to know what to expect when they upgrade
# For the developers to know what changes are allowed on a particular branch/
release
Do you think they need to be separate?
bq. HDFS metadata and data can change across minor or major releases , but such
changes are transparent to user application.
This is very assuring to users. 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.
> 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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