You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2006/03/01 00:52:40 UTC
[jira] Commented: (HADOOP-59) support generic command-line options
[ http://issues.apache.org/jira/browse/HADOOP-59?page=comments#action_12368188 ]
Doug Cutting commented on HADOOP-59:
------------------------------------
Michel,
I think that -D should define Hadoop configuration properties, not JVM system properties. And I don't think Hadoop configurations should by default include all of the JVM's system properties. Finally, please include good user-level javadoc on all public & protected items, attach Apache's license at the top of each file, try to bundle things into a single patch file, etc. These kinds of things make it much easier for me to commit a patch. Ideally all that I need to do is read the patch to see that it looks reasonable, apply it with 'patch -p 0 < patchFile', run unit tests and commit. Including new unit tests is also a good idea. If I need to clean up javadoc, licenses, formatting, etc. before I can commit then I will be less inclined to process a contribution promptly.
Doug
> 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
> Assignee: Michel Tourn
> Fix For: 0.1
> 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.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
http://www.atlassian.com/software/jira