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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9517) Document Hadoop Compatibility
Date Tue, 04 Jun 2013 18:37:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13674683#comment-13674683
] 

Karthik Kambatla commented on HADOOP-9517:
------------------------------------------

bq. Classes that subclass a Hadoop class to provide a plugin point MAY need recompiling on
each major version, possibly with the handling of changes to methods.

If the Hadoop class being extended is Public and the stability is defined by the annotation,
is that not sufficient indication to the user that it might need to be changed as that interface/class
changes. For example, we recently added a SchedulingPolicy to FairScheduler annotated Public-Evolving:
the policies written for the current version need to be updated as and when the SchedulingPolicy
class changes. Once it becomes stable, we follow the standard deprecation rules for Public-Stable
API that protects the policies. No?

I think it is important to detail how the API compatibility rules impact the user-level code.
May be I am missing something here. Otherwise, we might not need specific policies for them?
                
> 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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