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Hadoop, mail # user - set the mapred.map.tasks.speculative.execution=false, but it is not useful.


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Re: set the mapred.map.tasks.speculative.execution=false, but it is not useful.
Bejoy KS 2012-06-12, 13:10
Hi

If your intension is controlling the number of attempts every task make, then the property to be tweaked is

mapred.map.max.attempts

The default value is 4, for no map task re attempts make it 1.

Regards
Bejoy KS

Sent from handheld, please excuse typos.

-----Original Message-----
From: Jagat Singh <[EMAIL PROTECTED]>
Date: Tue, 12 Jun 2012 17:13:36
To: <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: Re: set the mapred.map.tasks.speculative.execution=false, but it is
 not useful.

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 <[EMAIL PROTECTED]> wrote:

> 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.
>