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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9193) hadoop script can inadvertently expand wildcard arguments when delegating to hdfs script
Date Wed, 09 Jan 2013 21:48:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13549053#comment-13549053
] 

Jason Lowe commented on HADOOP-9193:
------------------------------------

Note that this may be somewhat moot if HDFS-2745 is committed and no other delegated commands
are expected to take wildcard arguments or other types of arguments that could be accidentally
interpreted by the shell during the exec.
                
> 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: 2.0.2-alpha, 0.23.5
>            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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