Thanks Nitin.
What I need is to set slot only for a specific job, not for the whole
cluster conf.
But what I did does NOT work ... Have I done something wrong?
2013/4/30 Nitin Pawar <nitinpawar...@gmail.com>
> The config you are setting is for job only
>
> But if you want to reduce the slota on tasktrackers then you will need to
> edit tasktracker conf and restart tasktracker
> On Apr 30, 2013 3:30 PM, "Han JU" <ju.han.fe...@gmail.com> wrote:
>
>> Hi,
>>
>> I want to change the cluster's capacity of reduce slots on a per job
>> basis. Originally I have 8 reduce slots for a tasktracker.
>> I did:
>>
>> conf.set("mapred.tasktracker.reduce.tasks.maximum", "4");
>> ...
>> Job job = new Job(conf, ...)
>>
>>
>> And in the web UI I can see that for this job, the max reduce tasks is
>> exactly at 4, like I set. However hadoop still launches 8 reducer per
>> datanode ... why is this?
>>
>> How could I achieve this?
>> --
>> *JU Han*
>>
>> Software Engineer Intern @ KXEN Inc.
>> UTC - Université de Technologie de Compiègne
>> * **GI06 - Fouille de Données et Décisionnel*
>>
>> +33 0619608888
>>
>
--
*JU Han*
Software Engineer Intern @ KXEN Inc.
UTC - Université de Technologie de Compiègne
* **GI06 - Fouille de Données et Décisionnel*
+33 0619608888
