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Date: Sat, 20 Feb 2010 20:34:27 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6545) Cached FileSystem objects can lead
 to wrong token being used in setting up connections
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    [ https://issues.apache.org/jira/browse/HADOOP-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836257#action_12836257 ] 

Hudson commented on HADOOP-6545:
--------------------------------

Integrated in Hadoop-Common-trunk-Commit #179 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Common-trunk-Commit/179/])
    . Changes the Key for the FileSystem cache to be UGI. Contributed by Devaraj Das.


> Cached FileSystem objects can lead to wrong token being used in setting up connections
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6545
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6545
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.22.0
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.22.0
>
>         Attachments: 6545-1.patch, 6545-2.patch, 6545-bp20.patch
>
>
> The FileSystem class caches the filesystem objects that it creates for users. For some cases, e.g., if the filesystem object is actually a DistributedFileSystem, it also has an associated RPC client and hence an UGI for the respective user. This could lead to issues to do with using the right credentials when connecting with the namenode. The credentials in the UGI is never updated (even if the user in question now has new credentials) and in case the cached UGI's credentials have expired, this would lead to authentication error whenever there is a re-authentication (in the process of re-establishing connection to the namenode).

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