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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6545) Cached FileSystem objects can lead to wrong token being used in setting up connections
Date Mon, 08 Feb 2010 08:15:32 GMT
Cached FileSystem objects can lead to wrong token being used in setting up connections
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                 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
             Fix For: 0.22.0


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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