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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13714) Tighten up our compatibility guidelines for Hadoop 3
Date Mon, 04 Sep 2017 23:25:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16152976#comment-16152976
] 

Daniel Templeton commented on HADOOP-13714:
-------------------------------------------

I hear ya.

bq. I don't want to encourage things in, say, hadoop-common being marked as Public just because
I want to use them in, say hadoop-hdfs.

If there are Private things in common that are needed from HDFS, then they should be extended
to Limited Private (HDFS).  If all of common ends up as Limited Private (HDFS, MapReduce,
YARN), that's fine.

bq. And limited private {mapreduce}, well, we all knows that means "any yarn app".

Then those thing need to be public.  If we have interfaces that are consumed by the public
but that we don't have labeled in a way that enforces compatibility, that's bad.

> Tighten up our compatibility guidelines for Hadoop 3
> ----------------------------------------------------
>
>                 Key: HADOOP-13714
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13714
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.7.3
>            Reporter: Karthik Kambatla
>            Assignee: Daniel Templeton
>            Priority: Blocker
>         Attachments: HADOOP-13714.001.patch, HADOOP-13714.002.patch, HADOOP-13714.003.patch,
HADOOP-13714.WIP-001.patch
>
>
> Our current compatibility guidelines are incomplete and loose. For many categories, we
do not have a policy. It would be nice to actually define those policies so our users know
what to expect and the developers know what releases to target their changes. 



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