hadoop/hadoop-mapreduce-project/conf/mapred-env.cmd

@echo off
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@rem when HADOOP_JOB_HISTORYSERVER_HEAPSIZE is not defined, set it
if not defined HADOOP_JOB_HISTORYSERVER_HEAPSIZE (
  set HADOOP_JOB_HISTORYSERVER_HEAPSIZE=1000
)

set HADOOP_MAPRED_ROOT_LOGGER=%HADOOP_LOGLEVEL%,RFA