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From "Brian Bockelman (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5542) Group changes cause FUSE-DFS I/O error
Date Fri, 20 Mar 2009 14:32:50 GMT
Group changes cause FUSE-DFS I/O error
--------------------------------------

                 Key: HADOOP-5542
                 URL: https://issues.apache.org/jira/browse/HADOOP-5542
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.19.1
            Reporter: Brian Bockelman
            Assignee: Pete Wyckoff


If a user utilizes the FUSE mount, then has a group change, they will be unable to write into
FUSE using the new group information.

To duplicate (assuming user brian starts only in group brian):
1) Write file into FUSE (or do any other action)
2) Add user brian to group brian2
3) chown anything brian owns to brian:brian2.  The error message that gets passed along is:

[brian@red ~]$ chown brian:brian2 /mnt/hadoop/user/brian/test_group_perms2
chown: changing ownership of `/mnt/hadoop/user/brian/test_group_perms2': Input/output error

I believe this is due to the fact that group information is only looked up at NN connection
time?

If you then remount the FUSE mount, the chown command succeeds.

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