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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7325) hadoop command - do not accept class names starting with a hyphen
Date Tue, 24 May 2011 01:22:47 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brock Noland updated HADOOP-7325:
---------------------------------

    Attachment: hadoop-illegal-class-name-0.patch

Attached implements requested improvement.

> 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
>            Priority: Minor
>         Attachments: hadoop-illegal-class-name-0.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
behavior:
> {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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