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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1495) HDFS does not properly check permissions of files in a directory when doing rmr
Date Fri, 12 Nov 2010 01:51:13 GMT
HDFS does not properly check permissions of files in a directory when doing rmr
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                 Key: HDFS-1495
                 URL: https://issues.apache.org/jira/browse/HDFS-1495
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.20.2
            Reporter: Alan Gates


In POSIX file semantics, the ability to remove an entry a file is determined by whether the
user has write permissions on the directory containing the file.  However, to delete recursively
(rm -r) the user must have write permissions in all directories being removed.  Thus if you
have a directory structure like /a/b/c and a user has write permissions on a but not on b,
then he is not allowed to do 'rm -r b'.  This is because he does not have permissions to remove
c, so the rm of b fails, even though he has permission to remove b.

However, 'hadoop fs -rmr b' removes both b and c in this case.  It should instead fail and
return an error message saying the user does not have permission to remove c.  'hadoop fs
-rmr c' correctly fails.

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