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https://issues.apache.org/jira/browse/HADOOP-7325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-7325:
--------------------------------
Resolution: Fixed
Fix Version/s: 0.22.0
Status: Resolved (was: Patch Available)
Committed to trunk and 0.22. Thanks, Brock! Please do file patches for bin/hdfs
and bin/mapred in those projects as well.
> 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, hadoop-illegal-class-name-2.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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