set the mapred.map.tasks.speculative.execution=false, but it is not useful.

2012-06-12 Thread 林育智
hi all: I set the mapred.map.tasks.speculative.execution=false,but in the userlogs,you could found 3 attempt map task's log. have i miss something? expect your help. thanks.

Re: set the mapred.map.tasks.speculative.execution=false, but it is not useful.

2012-06-12 Thread Jagat Singh
Besides Speculative execution , Tasks can be attempted multiple times due to failures. So you can see 3 attempt there. On Tue, Jun 12, 2012 at 5:08 PM, 林育智 mylinyu...@gmail.com wrote: hi all: I set the mapred.map.tasks.speculative.execution=false,but in the userlogs,you could found 3

Re: set the mapred.map.tasks.speculative.execution=false, but it is not useful.

2012-06-12 Thread Bejoy KS
: Jagat Singh jagatsi...@gmail.com Date: Tue, 12 Jun 2012 17:13:36 To: common-user@hadoop.apache.org Reply-To: common-user@hadoop.apache.org Subject: Re: set the mapred.map.tasks.speculative.execution=false, but it is not useful. Besides Speculative execution , Tasks can be attempted multiple times