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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 Tue, 05 Sep 2017 17:37:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16154038#comment-16154038
] 

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

Maybe I'm missing your point.  Hadoop common is absolutely the common bits for use by Hadoop,
and hence Limited Private (HDFS, MapReduce, YARN, Common) seems quite reasonable.  Is there
are reason it isn't?

The point I'm trying to make is that the reason we want to set and uphold rules around audience
and stability is so that we can have a clear and sustainable contract with the consumers of
our interfaces.  If we have things that are labeled Limited Private (MapReduce) that everybody
just knows are really Public, then there's nothing to stop someone who doesn't just know from
breaking those APIs and all the downstream consumers.  If we make sure the Public interfaces
are actually labeled as Public, then we can catch the breakage before it happens.

> 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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