mapreduce.framework.name yarn Execution framework set to Hadoop YARN. mapreduce.map.memory.mb 4096 Larger resource limit for maps. mapreduce.map.java.opts -Xmx3072m Larger heap-size for child jvms of maps. mapreduce.reduce.memory.mb 8192 Larger resource limit for reduces. mapreduce.reduce.java.opts -Xmx6144m Larger heap-size for child jvms of reduces. mapreduce.task.io.sort.mb 512 Higher memory-limit while sorting data for efficiency. mapreduce.map.output.compress true mapreduce.map.output.compress.codec org.apache.hadoop.io.compress.GzipCodec mapreduce.reduce.shuffle.parallelcopies 50 Higher number of parallel copies run by reduces to fetch outputs from very large number of maps. mapreduce.jobhistory.address 137.195.143.131:10020 Default port is 10020. mapreduce.jobhistory.webapp.address 137.195.143.131:19888 Default port is 19888. mapreduce.jobhistory.intermediate-done-dir /mr-history/tmp Directory where history files are written by MapReduce jobs. mapreduce.jobhistory.done-dir /mr-history/done Directory where history files are managed by the MR JobHistory Server.