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https://issues.apache.org/jira/browse/HADOOP-8845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13465519#comment-13465519
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Harsh J commented on HADOOP-8845:
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Ping? Its a trivial fix to not lookup non-directories and I have tests attached
(similar to pClosure5, but that mkdired everything and couldn't run into
EXECUTE-less issues as described).
> When looking for parent paths info, globStatus must filter out non-directory
> elements to avoid an AccessControlException
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-8845
> URL: https://issues.apache.org/jira/browse/HADOOP-8845
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.0.0-alpha
> Reporter: Harsh J
> Assignee: Harsh J
> Labels: glob
> Attachments: HADOOP-8845.patch, HADOOP-8845.patch, HADOOP-8845.patch
>
>
> A brief description from my colleague Stephen Fritz who helped discover it:
> {code}
> [root@node1 ~]# su - hdfs
> -bash-4.1$ echo "My Test String">testfile <-- just a text file, for testing
> below
> -bash-4.1$ hadoop dfs -mkdir /tmp/testdir <-- create a directory
> -bash-4.1$ hadoop dfs -mkdir /tmp/testdir/1 <-- create a subdirectory
> -bash-4.1$ hadoop dfs -put testfile /tmp/testdir/1/testfile <-- put the test
> file in the subdirectory
> -bash-4.1$ hadoop dfs -put testfile /tmp/testdir/testfile <-- put the test
> file in the directory
> -bash-4.1$ hadoop dfs -lsr /tmp/testdir
> drwxr-xr-x - hdfs hadoop 0 2012-09-25 06:52 /tmp/testdir/1
> -rw-r--r-- 3 hdfs hadoop 15 2012-09-25 06:52 /tmp/testdir/1/testfile
> -rw-r--r-- 3 hdfs hadoop 15 2012-09-25 06:52 /tmp/testdir/testfile
> All files are where we expect them...OK, let's try reading
> -bash-4.1$ hadoop dfs -cat /tmp/testdir/testfile
> My Test String <-- success!
> -bash-4.1$ hadoop dfs -cat /tmp/testdir/1/testfile
> My Test String <-- success!
> -bash-4.1$ hadoop dfs -cat /tmp/testdir/*/testfile
> My Test String <-- success!
> Note that we used an '*' in the cat command, and it correctly found the
> subdirectory '/tmp/testdir/1', and ignore the regular file
> '/tmp/testdir/testfile'
> -bash-4.1$ exit
> logout
> [root@node1 ~]# su - testuser <-- lets try it as a different user:
> [testuser@node1 ~]$ hadoop dfs -lsr /tmp/testdir
> drwxr-xr-x - hdfs hadoop 0 2012-09-25 06:52 /tmp/testdir/1
> -rw-r--r-- 3 hdfs hadoop 15 2012-09-25 06:52 /tmp/testdir/1/testfile
> -rw-r--r-- 3 hdfs hadoop 15 2012-09-25 06:52 /tmp/testdir/testfile
> [testuser@node1 ~]$ hadoop dfs -cat /tmp/testdir/testfile
> My Test String <-- good
> [testuser@node1 ~]$ hadoop dfs -cat /tmp/testdir/1/testfile
> My Test String <-- so far so good
> [testuser@node1 ~]$ hadoop dfs -cat /tmp/testdir/*/testfile
> cat: org.apache.hadoop.security.AccessControlException: Permission denied:
> user=testuser, access=EXECUTE,
> inode="/tmp/testdir/testfile":hdfs:hadoop:-rw-r--r--
> {code}
> Essentially, we hit a ACE with access=EXECUTE on file /tmp/testdir/testfile
> cause we tried to access the /tmp/testdir/testfile/testfile as a path. This
> shouldn't happen, as the testfile is a file and not a path parent to be
> looked up upon.
> {code}
> 2012-09-25 07:24:27,406 INFO org.apache.hadoop.ipc.Server: IPC Server
> handler 2 on 8020, call getFileInfo(/tmp/testdir/testfile/testfile)
> {code}
> Surprisingly the superuser avoids hitting into the error, as a result of
> bypassing permissions, but that can be looked up on another JIRA - if it is
> fine to let it be like that or not.
> This JIRA targets a client-sided fix to not cause such /path/file/dir or
> /path/file/file kinda lookups.
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