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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5275) Mapreduce API: TokenCache incompatibility issues with MR1
Date Mon, 03 Jun 2013 19:36:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673470#comment-13673470

Daryn Sharp commented on MAPREDUCE-5275:

bq. I just verified again and it IS public in 1.x.

Yes, in 1.x it has the {{public}} keyword, but it's annotated {{@InterfaceAudience.Private}}
and the class is annotated {{@InterfaceStability.Evolving}}.  A method assuming a 1-to-1 fs
to token mapping cannot work with viewfs and 1-to-many.

The real question is why are we re-adding evolving/private methods removed 9 months ago? 
What broke?  Because it's already broken for viewfs, based on fragile assumptions if not broken
in other cases, and soon the whole assumption changes.  It won't be a problem if a retired
private api stays retired.
> Mapreduce API: TokenCache incompatibility issues with MR1
> ---------------------------------------------------------
>                 Key: MAPREDUCE-5275
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5275
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Mayank Bansal
>             Fix For: 2.1.0-beta
>         Attachments: MAPREDUCE-5275-trunk-1.patch, MAPREDUCE-5275-trunk-2.patch, MAPREDUCE-5275-trunk-3.patch,
> There're following incompatibility issues:
> * Token<DelegationTokenIdentifier> getDelegationToken(Credentials, String) is removed
> * Credentials loadTokens(String, Configuration) changes to Credentials loadTokens(String,

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