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From "Ahmad Humayun" <ahmad.hu...@gmail.com>
Subject Re: speculative execution
Date Wed, 17 Sep 2008 08:24:48 GMT
thanks :)

On Tue, Sep 16, 2008 at 12:46 PM, Arun C Murthy <acm@yahoo-inc.com> wrote:

>
> 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 <http://suraj.lums.edu.pk/%7Eahmadh>
>> +92 321 4457315
>>
>>
>


-- 
Ahmad Humayun
Research Associate
Computer Science Dpt., LUMS
http://suraj.lums.edu.pk/~ahmadh
+92 321 4457315

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