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https://issues.apache.org/jira/browse/HADOOP-8895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472404#comment-13472404
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Tom White commented on HADOOP-8895:
-----------------------------------
Abstract classes are easier to evolve than interfaces, since you can add a
method with a default implementation without breaking implementors.
TokenRenewer is only for use internally so it doesn't matter so much, but I
would still leave it as it is since it's always possible to create a new
implementation class that extends the abstract class.
> TokenRenewer should be an interface, it is currently a fully abstract class
> ---------------------------------------------------------------------------
>
> Key: HADOOP-8895
> URL: https://issues.apache.org/jira/browse/HADOOP-8895
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.0.1-alpha
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Minor
> Attachments: HADOOP-8895.patch
>
>
> TokenRenewer is a fully abstract class. Making it an interface will allow
> classes extending other classes to implement the interface.
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