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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9193) hadoop script can inadvertently expand wildcard arguments when delegating to hdfs script
Date Wed, 09 Jan 2013 21:46:13 GMT
Jason Lowe created HADOOP-9193:
----------------------------------

             Summary: hadoop script can inadvertently expand wildcard arguments when delegating
to hdfs script
                 Key: HADOOP-9193
                 URL: https://issues.apache.org/jira/browse/HADOOP-9193
             Project: Hadoop Common
          Issue Type: Bug
          Components: scripts
    Affects Versions: 0.23.5, 2.0.2-alpha
            Reporter: Jason Lowe
            Priority: Minor


The hadoop front-end script will print a deprecation warning and defer to the hdfs front-end
script for certain commands, like fsck, dfs.  If a wildcard appears as an argument then it
can be inadvertently expanded by the shell to match a local filesystem path before being sent
to the hdfs script, which can be very confusing to the end user.

For example, the following two commands usually perform very different things, even though
they should be equivalent:

hadoop fs -ls /tmp/\*
hadoop dfs -ls /tmp/\*

The former lists everything in the default filesystem under /tmp, while the latter expands
/tmp/\* into everything in the *local* filesystem under /tmp and passes those as arguments
to try to list in the default filesystem.


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