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

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: scripts
• Assignee: Edward J. Yoon
• Reporter: Tsz-wo Sze
• Created: 18/Apr/08 17:50
• Updated: 14/Dec/14 17:10
• Resolved: 14/Dec/14 17:10

Description

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,

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)
...

The behavior above is confusing. We should check whether the parameter is a valid class name before passing it to java.

Issue Links

• is related to: HADOOP-11092 hadoop shell commands should print usage if not given a class