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https://issues.apache.org/jira/browse/HADOOP-8895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471599#comment-13471599
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Daryn Sharp commented on HADOOP-8895:
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Just curious, do you have a specific case in mind where this would be useful?
Keep in mind that the service loader is going to instantiate the registered
classes with their default ctor, which probably won't work well for heavier
weight classes intended for other purposes.
> 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
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Minor
>
> TokenRenewer is a fully abstract class. Making it an interface will allow
> classes extending other classes to implement the interface.
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