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https://issues.apache.org/jira/browse/HADOOP-10506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13970085#comment-13970085
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Thomas Graves commented on HADOOP-10506:
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So you are sayings it purely informational and if I'm a "closely related
product" I can use it and should update the annotation? Backwards compatibility
guarantees are by the InterfaceStability tag but in the LimitedPrivate we will
contact/negotiate with the components listed before making any changes.
So I guess the question is what is a "closely related product". Do all apache
products fall into that category?
One example of this that seems a bit ridiculous is UserGroupInformation:
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce", "HBase", "Hive",
"Oozie"})
> 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 out of date.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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