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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7325) hadoop command - do not accept class names starting with a hyphen
Date Mon, 13 Jun 2011 21:49:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048805#comment-13048805

Brock Noland commented on HADOOP-7325:

Looking at the hdfs and mapred commands, they do not seem to allow the "command" to be a direct
classname and also have unknown command handling built in, so I do not think they need to
be updated. If someone disagrees, please share!

elif [ "$COMMAND" = "groups" ] ; then
  echo $COMMAND - invalid command

> hadoop command - do not accept class names starting with a hyphen
> -----------------------------------------------------------------
>                 Key: HADOOP-7325
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7325
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>            Priority: Minor
>             Fix For: 0.22.0
>         Attachments: hadoop-illegal-class-name-0.patch, hadoop-illegal-class-name-1.patch,
> If this is committed I will look at patches for hdfs and mapred.
> When teaching a good portion of the students in every single class execute:
> {code}
> $ hadoop -fs ls /
> {code}
> The -fs is passed directly to the JVM and the JVM fails to start:
> {code}
> $ ./bin/hadoop -fs ls /
> Unrecognized option: -fs
> Could not create the Java virtual machine.
> {code}
> Which is confusing and typically requires explanation. The attached patch improves that
> {code}
> $ ./bin/hadoop -fs ls /
> Error: No command named `-fs' was found. Perhaps you meant `hadoop fs'
> {code}
> The only risk I can see is if someone is abusing the implementation of hadoop command
doing something like so:
> {code}
> $ ./bin/hadoop -Xmx1g  org.apache.hadoop.util.RunJar
> RunJar jarFile [mainClass] args...
> {code}
> The hadoop command does not appear to advertise allowing JVM options before the classname.

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