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MapReduce >> mail # user >> Hadoop Installation Mappers setting


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Re: Hadoop Installation Mappers setting
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 <[EMAIL PROTECTED]>
Date: Thu, 23 May 2013 18:10:38
To: <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: Hadoop Installation Mappers setting

Hi,

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