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From "Siddharth Seth (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7933) Viewfs changes for MAPREDUCE-3529
Date Wed, 21 Dec 2011 00:47:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siddharth Seth updated HADOOP-7933:
-----------------------------------

    Status: Patch Available  (was: Open)
    
> Viewfs changes for MAPREDUCE-3529
> ---------------------------------
>
>                 Key: HADOOP-7933
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7933
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>            Priority: Critical
>         Attachments: HADOOP-7933.txt, HADOOP7933_v1.txt, HDFS2665_v1.txt, HDFS2665_v1.txt
>
>
> ViewFs.getDelegationTokens returns a list of tokens for the associated namenodes. Credentials
serializes these tokens using the service name for the actual namenodes. Effectively, tokens
are not cached for viewfs (some more details in MR 3529). Affects any job which uses the TokenCache
in tasks along with viewfs (some Pig jobs).
> Talk to Jitendra about this, some options
> 1. Change Credentials.getAllTokens to return the key, instead of just a token list (associate
the viewfs canonical name with a token in credentials)
> 2. Have viewfs issue a fake token.
> Both of these would allow for a single viewfs configuration only.
> 3. An additional API in FileSystem - something like getDelegationTokens(String renewer,
Credentials credentials) - which would check the credentials object before making token requests
to the actual namenode.
> 4. An additional API in FileSystem - getCanonicalServiceNames - similar to getDelegationTokens,
which would return service names for the actual namenodes. TokenCache/Credentials can work
using this list.
> 5. have getDelegationTokens check the current UGI - and fetch tokens only if they don't
exist.
> Have a quick patch for 3, along with associated MR changes.

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