Hi all, Previously with MapReduceV1, the suggestion was to have a 1:1 correspondence between workers and compute nodes (machines) and set the number of the threads to be the number of cores per machines. To achieve this configuration, we would set "mapred.tasktracker.map.tasks.maximum=1". Since workers correspond to mappers this would ensure there was one worker per machine.
Now I am reading that with Yarn this property longer exists as there aren't tasktrackers. Instead, we have the global properties "yarn.nodemanager.resource.cpu-vcores", which specifies the cores _per node_, and the property "mapreduce.map.cpu.vcores", which specifies the cores _per map task_. If we want to have one mapper per node that is fully utilizing the machine, I assume we should just set mapreduce.map.cpu.vcores = yarn.nodemanager.resource.cpu-vcores = the # of cores per node. Is this correct? Do I still need to set giraph.numComputeThreads to be the number of cores per node? Thanks, Steve
