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MapReduce, mail # user - mapred.tasktracker.map.tasks.maximum


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Re: mapred.tasktracker.map.tasks.maximum
Mark Kerzner 2012-11-13, 15:25
Exactly! I found the right one, and it is 80.

Thank you,
Mark

On Tue, Nov 13, 2012 at 10:23 AM, Serge Blazhiyevskyy <
[EMAIL PROTECTED]> wrote:

> Look on the job tracker web UI is parameter has taken effect (port 50030)
>
> It might be in the wrong config file or something
>
>
> Serge
>
> From: Mark Kerzner <[EMAIL PROTECTED]<mailto:
> [EMAIL PROTECTED]>>
> Reply-To: "[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>" <
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
> Date: Tuesday, November 13, 2012 5:19 PM
> To: "[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>" <
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
> Subject: Re: mapred.tasktracker.map.tasks.maximum
>
> 1.0.1
>
> On Tue, Nov 13, 2012 at 10:18 AM, Serge Blazhiyevskyy <
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
> What hadoop version are we talking about?
>
> From: Mark Kerzner <[EMAIL PROTECTED]<mailto:
> [EMAIL PROTECTED]><mailto:[EMAIL PROTECTED]<mailto:
> [EMAIL PROTECTED]>>>
> Reply-To: "[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]><mailto:
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>" <
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]><mailto:
> [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>>
> Date: Tuesday, November 13, 2012 5:16 PM
> To: Hadoop User <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]
> ><mailto:[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>>
>  Subject: mapred.tasktracker.map.tasks.maximum
>
> Hi,
>
> I have a cluster with 4 nodes and 32 many cores on each. My default value
> for the maximum number of mappers per slot is 1:
>
>   <property>
>     <name>mapred.tasktracker.map.tasks.maximum</name>
>     <!-- see other kb entry about this one. -->
>     <value>1</value>
>     <final>true</final>
>   </property>
> (which I think is wrong).
>
> Howeve, when sizable jobs run, I see 65 mappers working, so it seems that
> it does create more than 1 mapper per node.
>
> Questions: what maximum number of mappers would be appropriate in this
> situation? Is that the right way to set them?
>
> Thank you. Sincerely,
> Mark
>
>