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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10506) LimitedPrivate annotation not useful
Date Tue, 20 May 2014 14:08:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003318#comment-14003318

Thomas Graves commented on HADOOP-10506:

Sorry for my delay, I somehow missed your comment go by. 

One of the main ones is UserGroupInformation.  As I mentioned above, you can tell just by
how many components are listed in the LimitedPrivate clause. 

I've filed separate jira in YARN land for a few there also.  Vinod nicely bundled them under

I've been distracted by other things recently though and haven't finished trying to convert
everything to public interfaces so there are likely a few more. 

Since there haven't been any other disagreements with this perhaps I will file a jira to atleast
update the docs about LimitedPrivate for the 2 bullets I mention above:

1) clarify documentation what limitedPrivate is. This means us internally agreeing on what
it really means. 
2) No new classes/interfaces should use this tag. They should be properly classified as either
public or private. If there was a bug and class not properly tagged its fine to use there.

> LimitedPrivate annotation not useful
> ------------------------------------
>                 Key: HADOOP-10506
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10506
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Thomas Graves
> The LimitedPrivate annotation isn't useful.  The intention seems to have been those interfaces
were only intended to be used by these components.  But in many cases those components are
separate from core hadoop.  This means any changes to them will break backwards compatibility
with those, which breaks the new compatibility rules in Hadoop.  
> Note that many of the annotation are also not marked properly, or have fallen out of
date.  I see Public Interfaces that use LimitedPrivate classes in the api.  (TokenCache using
Credentials is an example). 

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