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From bejoy.had...@gmail.com
Subject Re: Hadoop Installation Mappers setting
Date Thu, 23 May 2013 14:18:55 GMT
Hi

I assume the question is on how many slots.

It dependents on
- the child/task jvm size and the available memory.
- available number of cores 



Your available memory for tasks is total memory - memory used for OS and other services running
on your box.

Other services include non hadoop services as well as hadoop daemons.

 Divide the available memory with child jvm size and that would get the max num of slots.

 Also check whether sufficient number of cores are available as well.



Regards 
Bejoy KS

Sent from remote device, Please excuse typos

-----Original Message-----
From: Jitendra Yadav <jeetuyadav200890@gmail.com>
Date: Thu, 23 May 2013 18:10:38 
To: <user@hadoop.apache.org>
Reply-To: user@hadoop.apache.org
Subject: Hadoop Installation Mappers setting

Hi,

While installing hadoop cluster, how we can calculate the exact number of
mappers value.


Thanks~


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