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Posted to common-dev@hadoop.apache.org by "Sameer Paranjpye (JIRA)" <ji...@apache.org> on 2006/05/30 20:40:31 UTC
[jira] Updated: (HADOOP-59) support generic command-line options
[ http://issues.apache.org/jira/browse/HADOOP-59?page=all ]
Sameer Paranjpye updated HADOOP-59:
-----------------------------------
Fix Version: 0.4
(was: 0.3)
Priority: Minor (was: Major)
> support generic command-line options
> ------------------------------------
>
> Key: HADOOP-59
> URL: http://issues.apache.org/jira/browse/HADOOP-59
> Project: Hadoop
> Type: Improvement
> Components: conf
> Versions: 0.2
> Reporter: Doug Cutting
> Assignee: Michel Tourn
> Priority: Minor
> Fix For: 0.4
> Attachments: Tool.java, ToolBase.java, bashfile.patch, toolbase.patch
>
> 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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