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.
Sent from remote device, Please excuse typos
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
While installing hadoop cluster, how we can calculate the exact number of