On a cluster running MapReduce v1 (MRv1), the value of the
mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file
should be set to:
A.
Half the number of the maximum number of Reduce tasks which can run simultaneously on an
individual node.
B.
The maximum number of Map tasks can run simultaneously on an individual node.
C.
The same value on each slave node.
D.
The maximum number of Map tasks which can run on the cluster as a whole.
E.
Half the number of the maximum number of Reduce tasks which can run on the cluster as a
whole.
Explanation:
mapred.tasktracker.map.tasks.maximum
Range: 1/2 * (cores/node) to 2 * (cores/node)
Description: Number of map tasks to deploy on each machine.