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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