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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8895) TokenRenewer should be an interface, it is currently a fully abstract class
Date Tue, 09 Oct 2012 14:15:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472412#comment-13472412

Daryn Sharp commented on HADOOP-8895:

bq. For instance, if a WebHdfsFileSystem could implement TokenRenewer, we might not need DelegationTokenRenewer.Renewable.

Correct to the second half.  The {{DelegationTokenRenewer.Renewable}} interface only existed
for the code being removed, so it too should be removed.

I actually intended for {{TokenRenewer}} to be implemented as an interface for classes implementing
tokens.  This idea was rejected in favor of using lower level renewers that bypassed the token
issuing class.  I believe part of the idea as a class is to force simple lightweight renewer
objects since the service loader will instantiate all of them.

Also, the filesystems currently cannot directly implement {{TokenRenewer}} because the service
loader instantiation won't be usable.  It will either need to instantiate another copy of
itself or its lower level client with the token's address, or will need to initialize itself
- but filesystems are not designed to be initialized multiple times.

This is why I think it's not needed.
> 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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