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From lohit <lohit...@yahoo.com>
Subject Re: speculative execution
Date Tue, 16 Sep 2008 07:33:53 GMT
<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>

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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