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

Jitendra Yadav 2013-05-23, 12:40
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Re: Hadoop Installation Mappers setting

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.

Bejoy KS

Sent from remote device, Please excuse typos

-----Original Message-----
From: Jitendra Yadav <[EMAIL PROTECTED]>
Date: Thu, 23 May 2013 18:10:38
Subject: Hadoop Installation Mappers setting


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

Amal G Jose 2013-05-23, 17:33