support generic command-line options
------------------------------------
Key: HADOOP-59
URL: http://issues.apache.org/jira/browse/HADOOP-59
Project: Hadoop
Type: Improvement
Components: conf
Versions: 0.1
Reporter: Doug Cutting
Fix For: 0.1
Hadoop commands should all support some common options. For example, it should
be possible to specify the namenode, datanode, and, for that matter, any config
option, in a generic way.
This could be implemented with code like:
public interface Tool extends Configurable {
void run(String[] args) throws Exception;
}
public class ToolBase implements Tool extends Configured {
public final void main(String[] args) throws Exception {
Configuration conf = new Configuration();
... parse config options from args into conf ...
this.configure(conf);
this.run();
}
}
public MyTool extends ExcecutableBase {
public static void main(String[] args) throws Exception {
new MyTool().main(args);
}
}
The general command line syntax could be:
bin/hadoop [generalOptions] command [commandOptions]
Where generalOptions are things that ToolBase handles, and only the
commandOptions are passed to Tool.run(). The most important generalOption
would be '-D', which would define name/value pairs that are set in the
configuration. This alone would permit folks to set the namenode, datanode,
etc.
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