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From Mark Kerzner <mark.kerz...@shmsoft.com>
Subject Re: mapred.tasktracker.map.tasks.maximum
Date Tue, 13 Nov 2012 15:25:04 GMT
Exactly! I found the right one, and it is 80.

Thank you,
Mark

On Tue, Nov 13, 2012 at 10:23 AM, Serge Blazhiyevskyy <
Serge.Blazhiyevskyy@nice.com> 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 <mark.kerzner@shmsoft.com<mailto:
> mark.kerzner@shmsoft.com>>
> Reply-To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <
> user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
> Date: Tuesday, November 13, 2012 5:19 PM
> To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <
> user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
> Subject: Re: mapred.tasktracker.map.tasks.maximum
>
> 1.0.1
>
> On Tue, Nov 13, 2012 at 10:18 AM, Serge Blazhiyevskyy <
> Serge.Blazhiyevskyy@nice.com<mailto:Serge.Blazhiyevskyy@nice.com>> wrote:
> What hadoop version are we talking about?
>
> From: Mark Kerzner <mark.kerzner@shmsoft.com<mailto:
> mark.kerzner@shmsoft.com><mailto:mark.kerzner@shmsoft.com<mailto:
> mark.kerzner@shmsoft.com>>>
> Reply-To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org><mailto:
> user@hadoop.apache.org<mailto:user@hadoop.apache.org>>" <
> user@hadoop.apache.org<mailto:user@hadoop.apache.org><mailto:
> user@hadoop.apache.org<mailto:user@hadoop.apache.org>>>
> Date: Tuesday, November 13, 2012 5:16 PM
> To: Hadoop User <user@hadoop.apache.org<mailto:user@hadoop.apache.org
> ><mailto:user@hadoop.apache.org<mailto:user@hadoop.apache.org>>>
>  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
>
>

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