Is there a means of looking up the current value of a configuration
variable, in particular one that is not explicitly set in one of the
.conf files?

For instance if I wanted to find the value of "io.file.buffer.size"
(just a random example) how would I go about it?

Thanks
- Adam Phelps

Trunk has a configuration servlet (/conf) that exposes configuration.  I
think it's in CDH3b3 (Cloudera's Distribution) as well.

https://issues.apache.org/jira/browse/HADOOP-6408

Cheers,

-- Philip

On Mon, Oct 18, 2010 at 3:17 PM, Adam Phelps <[EMAIL PROTECTED]> wrote:

> Is there a means of looking up the current value of a configuration
> variable, in particular one that is not explicitly set in one of the .conf
> files?
>
> For instance if I wanted to find the value of "io.file.buffer.size" (just a
> random example) how would I go about it?
>
> Thanks
> - Adam Phelps
>

If you just want a quick visual inspection, you can use the jobconf.jsp by clicking on the xml at the top of a job page in the jobtracker.
On Oct 18, 2010, at 3:21 PM, Philip Zeyliger wrote:

> Trunk has a configuration servlet (/conf) that exposes configuration.  I
> think it's in CDH3b3 (Cloudera's Distribution) as well.
>
> https://issues.apache.org/jira/browse/HADOOP-6408
>
> Cheers,
>
> -- Philip
>
> On Mon, Oct 18, 2010 at 3:17 PM, Adam Phelps <[EMAIL PROTECTED]> wrote:
>
>> Is there a means of looking up the current value of a configuration
>> variable, in particular one that is not explicitly set in one of the .conf
>> files?
>>
>> For instance if I wanted to find the value of "io.file.buffer.size" (just a
>> random example) how would I go about it?
>>
>> Thanks
>> - Adam Phelps
>>

> Is there a means of looking up the current value of a configuration
> variable, in particular one that is not explicitly set in one of the
> .conf files?

http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/conf/Configuration.html#get%28java.lang.String%29
> For instance if I wanted to find the value of "io.file.buffer.size"
> (just a random example) how would I go about it?

public class MyApp extends Configured implements Tool {

     public int run(final String[] args) throws Exception {
         final Configuration conf = getConf();
         ...
         final String property = conf.get("io.file.buffer.size");
         ...
     }

     public static void main(final String[] args) throws Exception {
         final int res = ToolRunner.run(new Configuration(), new
MyApp(), args);
         System.exit(res);
     }

}