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From Arun C Murthy <...@yahoo-inc.com>
Subject Re: speculative execution
Date Tue, 16 Sep 2008 07:46:12 GMT

On Sep 16, 2008, at 12:33 AM, lohit wrote:

> <property>
>  <name>mapred.map.tasks.speculative.execution</name>
>  <value>true</value>
>  <description>If true, then multiple instances of some map tasks
>               may be executed in parallel.</description>
> </property>
>

And similarly for reduces: mapred.reduce.tasks.speculative.execution.

Arun

> You can change that to false.
> That would be cluster wide change, also you could change that per  
> job basis like passing it as config like any other configs of hadoop.
> Thanks,
> Lohit
>
>
>
>
> ----- Original Message ----
> From: Ahmad Humayun <ahmad.humyn@gmail.com>
> To: core-dev@hadoop.apache.org
> Sent: Tuesday, September 16, 2008 12:18:56 AM
> Subject: speculative execution
>
> How do you shut-off speculative execution in Hadoop
>
> Thanks for the help
>
>
> regards,
> -- 
> Ahmad Humayun
> Research Associate
> Computer Science Dpt., LUMS
> http://suraj.lums.edu.pk/~ahmadh
> +92 321 4457315
>


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