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Posted to common-user@hadoop.apache.org by Heshan Lin <hl...@ncsu.edu> on 2008/07/01 07:32:50 UTC

How to configure RandomWriter to generate less amount of data

Hi,

I'm trying to configure RandomWriter to generate less data than does  
the default configuration. I created a job configuration file job.xml  
and added in variables given at http://wiki.apache.org/hadoop/ 
RandomWriter. Tried a couple of ways of running the program below,  
but configurations in job.xml were not taken by RandomWriter.

1) bin/hadoop jar hadoop-*-examples.jar randomwriter rand job.xml
2) bin/hadoop jar hadoop-*-examples.jar randomwriter rand --conf job.xml
3) bin/hadoop jar --conf job.xml hadoop-*-examples.jar randomwriter rand

Passing property values via the -D option didn't seem to work either.  
Can anybody advise on how to use the job configuration file properly?

Thanks,
Heshan

Re: How to configure RandomWriter to generate less amount of data

Posted by Heshan Lin <hl...@ncsu.edu>.

Thanks a bunch, Amar! It works fine.

/Heshan


On Jul 1, 2008, at 1:44 AM, Amar Kamat wrote:

> Heshan Lin wrote:
>> Hi,
>>
>> I'm trying to configure RandomWriter to generate less data than  
>> does the default configuration.
> bin/hadoop jar hadoop-*-examples.jar randomwriter - 
> Dtest.randomwrite.bytes_per_map=<value> - 
> Dtest.randomwrite.total_bytes=<value> - 
> Dtest.randomwriter.maps_per_host=<value> <input-filename>
> The number of maps that will be spawned in this case will be  
> total_bytes/bytes_per_map.
> Other parameters are test.randomwrite.min_key (size in bytes),  
> test.randomwrite.max_key (size in bytes),  
> test.randomwrite.min_value (size in bytes) and  
> test.randomwrite.max_value (size in bytes).
> Amar
>> I created a job configuration file job.xml and added in variables  
>> given at http://wiki.apache.org/hadoop/RandomWriter. Tried a  
>> couple of ways of running the program below, but configurations in  
>> job.xml were not taken by RandomWriter.
>>
>> 1) bin/hadoop jar hadoop-*-examples.jar randomwriter rand job.xml
>> 2) bin/hadoop jar hadoop-*-examples.jar randomwriter rand --conf  
>> job.xml
>> 3) bin/hadoop jar --conf job.xml hadoop-*-examples.jar  
>> randomwriter rand
>>
>> Passing property values via the -D option didn't seem to work  
>> either. Can anybody advise on how to use the job configuration  
>> file properly?
>>
>> Thanks,
>> Heshan
>

Re: How to configure RandomWriter to generate less amount of data

Posted by Amar Kamat <am...@yahoo-inc.com>.

Heshan Lin wrote:
> Hi,
>
> I'm trying to configure RandomWriter to generate less data than does 
> the default configuration. 
bin/hadoop jar hadoop-*-examples.jar randomwriter 
-Dtest.randomwrite.bytes_per_map=<value> 
-Dtest.randomwrite.total_bytes=<value> 
-Dtest.randomwriter.maps_per_host=<value> <input-filename>
The number of maps that will be spawned in this case will be 
total_bytes/bytes_per_map.
Other parameters are test.randomwrite.min_key (size in bytes), 
test.randomwrite.max_key (size in bytes), test.randomwrite.min_value 
(size in bytes) and test.randomwrite.max_value (size in bytes).
Amar
> I created a job configuration file job.xml and added in variables 
> given at http://wiki.apache.org/hadoop/RandomWriter. Tried a couple of 
> ways of running the program below, but configurations in job.xml were 
> not taken by RandomWriter.
>
> 1) bin/hadoop jar hadoop-*-examples.jar randomwriter rand job.xml
> 2) bin/hadoop jar hadoop-*-examples.jar randomwriter rand --conf job.xml
> 3) bin/hadoop jar --conf job.xml hadoop-*-examples.jar randomwriter rand
>
> Passing property values via the -D option didn't seem to work either. 
> Can anybody advise on how to use the job configuration file properly?
>
> Thanks,
> Heshan