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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3825) MR should not be getting duplicate tokens for a MR Job.
Date Tue, 14 Feb 2012 15:09:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207767#comment-13207767
] 

Daryn Sharp commented on MAPREDUCE-3825:
----------------------------------------

If there are external multi-token filesystems, that currently work, then they have implemented
{{getDelegationTokens(renewer, creds)}}.  Those filesystems will continue to work so long
as {{getDelegationTokens(renewer, creds)}} isn't marked {{final}} as also proposed.  W/o {{final}},
the proposal is completely backwards compatible.
                
> MR should not be getting duplicate tokens for a MR Job.
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-3825
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3825
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.23.1, 0.24.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: MAPREDUCE-3825.patch, TokenCache.pdf
>
>
> This is the counterpart to HADOOP-7967.  
> MR gets tokens for all input, output and the default filesystem when a MR job is submitted.

> The APIs in FileSystem make it challenging to avoid duplicate tokens when there are file
systems that have embedded
> filesystems.
> Here is the original description that Daryn wrote: 
> The token cache currently tries to assume a filesystem's token service key.  The assumption
generally worked while there was a one to one mapping of filesystem to token.  With the advent
of multi-token filesystems like viewfs, the token cache will try to use a service key (ie.
for viewfs) that will never exist (because it really gets the mounted fs tokens).
> The descriop

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