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