bin/hadoop script should check class name before running java
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Key: HADOOP-3281
URL: https://issues.apache.org/jira/browse/HADOOP-3281
Project: Hadoop Core
Issue Type: Bug
Components: scripts
Reporter: Tsz Wo (Nicholas), SZE
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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