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From "Daryn Sharp (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7967) Need generalized multi-token filesystem support
Date Tue, 10 Jan 2012 17:07:39 GMT
Need generalized multi-token filesystem support
-----------------------------------------------

                 Key: HADOOP-7967
                 URL: https://issues.apache.org/jira/browse/HADOOP-7967
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs, security
    Affects Versions: 0.24.0, 0.23.1
            Reporter: Daryn Sharp


Multi-token filesystem support and its interactions with the MR {{TokenCache}} is problematic.
 The {{TokenCache}} tries to assume it has the knowledge to know if the tokens for a filesystem
are available, which it can't possibly know for multi-token filesystems.  Filtered filesystems
are also problematic, such as har on viewfs.  When mergeFs is implemented, it too will become
a problem with the current implementation.  Currently {{FileSystem}} will leak tokens even
when some tokens are already present.

The decision for token acquisition, and which tokens, should be pushed all the way down into
the {{FileSystem}} level.  The {{TokenCache}} should be ignorant and simply request tokens
from each {{FileSystem}}.

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