[jira] [Commented] (HADOOP-3281) bin/hadoop script should check class name before running java

["Harsh J (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177011#comment-13177011 ] 

Harsh J commented on HADOOP-3281:
---------------------------------

I think a better approach would be to observe java's return code and throw out an appropriate message? Apart from making the 'feature' of running classes from 'hadoop classpath' via 'hadoop clazz' more visible via docs/helpstrings.
                
> bin/hadoop script should check class name before running java
> -------------------------------------------------------------
>
>                 Key: HADOOP-3281
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3281
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Edward J. Yoon
>         Attachments: 3281.patch, 3281_v01.patch
>
>
> When the first parameter ($1) cannot be matched with one of existing hadoop commnads, the parameter will be considered as a class name and the script will pass it to java.  For examples,
> {noformat}
> bash-3.2$ ./bin/hadoop -version
> java version "1.5.0_14"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
> Java HotSpot(TM) Client VM (build 1.5.0_14-b03, mixed mode)
> bash-3.2$ ./bin/hadoop -help   
> Usage: java [-options] class [args...]
>            (to execute a class)
>    or  java [-options] -jar jarfile [args...]
>            (to execute a jar file)
> ...
> {noformat}
> The behavior above is confusing.  We should check whether the parameter is a valid class name before passing it to java.

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