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https://issues.apache.org/jira/browse/HADOOP-6668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874089#action_12874089
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Sanjay Radia commented on HADOOP-6668:
--------------------------------------

> PositionedReadable, Seekable and Syncable:

The definitions of the methods are in the PositionedReadable, Seekable and 
Syncable Java interfaces. 
The definitions of the methods are needed in the user javadoc; only APis's 
marked as audience public
appear in the user javadoc.
The user can reasonably  expect to  lookup  an extended  interfaces of an 
audience-public API. 
The only way to avoid this is to actually copy the method signatures but not 
extend the interfaces.
Unless we are prepared to do that, I think  we are stuck with making them 
audience public. 
Hairong is probably right that the originally these interfaces were targeted 
for the implementor.

> Apply audience and stability annotations to classes in common
> -------------------------------------------------------------
>
>                 Key: HADOOP-6668
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6668
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: documentation
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: common.interface-tw-annotated.txt, HADOOP-6668.patch, 
> HADOOP-6668.patch, HADOOP-6668.patch, HADOOP-6668.patch, HADOOP-6668.patch, 
> HADOOP-6668.patch, HADOOP-6668.patch, HADOOP-6668.patch
>
>
> Mark private implementation classes with the InterfaceAudience.Private or 
> InterfaceAudience.LimitedPrivate annotation to exclude them from user Javadoc 
> and JDiff.

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