java - How to limit a Hadoop MapReduce job to a certain number of nodes? -


so, have system 4 data nodes. however, check scalability of hadoop application, want test 1, 2 , 4 nodes. so, how can limit number of nodes used hadoop 1 or 2. using hadoop 2.5.1 , don't have admin rights system. moreover, how can control number of cores used hadoop node?

you need admin rights that

how can limit number of nodes used hadoop 1 or 2.

decommission 2-3 nodes

how can control number of cores used hadoop node

set below config in yarn-site.xml allocate 8 vcores per node

<property>     <name>yarn.nodemanager.resource.cpu-vcores</name>     <value>8</value> </property>

also update yarn.scheduler.capacity.resource-calculator in capacity-scheduler.xml because defaultresourcecalculator uses memory.

  <property>     <name>yarn.scheduler.capacity.resource-calculator</name>     <value>org.apache.hadoop.yarn.util.resource.dominantresourcecalculator</value>     <description>       resourcecalculator implementation used compare       resources in scheduler.       default i.e. defaultresourcecalculator uses memory while       dominantresourcecalculator uses dominant-resource compare       multi-dimensional resources such memory, cpu etc.     </description>   </property>

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