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Posted to common-user@hadoop.apache.org by Sisu Xi <xi...@gmail.com> on 2014/07/15 05:02:01 UTC

default 8 mappers per host ?

Hi, all:

I configured a hadoop cluster with 9 hosts, each with 2 VCPU and 4G Ram.

I noticed when I run the example pi program, only when I configure it with
at least 8*9=72 mappers will all hosts be busy.
Which means there is a default 8 mappers per host?

How is this value decided? And where can I change it?

Thanks very much!

Sisu

-- 


*Sisu Xi, PhD Candidate*

http://www.cse.wustl.edu/~xis/
Department of Computer Science and Engineering
Campus Box 1045
Washington University in St. Louis
One Brookings Drive
St. Louis, MO 63130