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

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# (the "License"); you may not use this file except in compliance with
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#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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##
## THIS FILE ACTS AS AN OVERRIDE FOR hadoop-env.sh FOR ALL
## WORK DONE BY THE mapred AND RELATED COMMANDS.
##
## Precedence rules:
##
## mapred-env.sh > hadoop-env.sh > hard-coded defaults
##
## MAPRED_xyz > HADOOP_xyz > hard-coded defaults
##

###
# Generic settings for MapReduce
###

#Override the log4j settings for all MR apps
# Java property: hadoop.root.logger
# export MAPRED_ROOT_LOGGER="INFO,console"

# Override Hadoop's log directory & file
# Java property: hadoop.log.dir
# export HADOOP_MAPRED_LOG_DIR=""

# Override Hadoop's pid directory
# export HADOOP_MAPRED_PID_DIR=

# Override Hadoop's identity string. $USER by default.
# This is used in writing log and pid files, so keep that in mind!
# Java property: hadoop.id.str
# export HADOOP_MAPRED_IDENT_STRING=$USER

# Override Hadoop's process priority
# Note that sub-processes will also run at this level!
# export HADOOP_MAPRED_NICENESS=0

###
# Job History Server specific parameters
###

# Specify the max heapsize for the JobHistoryServer.  If no units are
# given, it will be assumed to be in MB.
# This value will be overridden by an Xmx setting specified in either YARN_OPTS,
# HADOOP_OPTS, and/or HADOOP_JOB_HISTORYSERVER_OPTS.
# Default is the same as HADOOP_HEAPSIZE_MAX.
#export HADOOP_JOB_HISTORYSERVER_HEAPSIZE=

# Specify the JVM options to be used when starting the HistoryServer.
# These options will be appended to the options specified as YARN_OPTS
# and therefore may override any similar flags set in YARN_OPTS
#export HADOOP_JOB_HISTORYSERVER_OPTS=

# Specify the log4j settings for the JobHistoryServer
# Java property: hadoop.root.logger
#export HADOOP_JHS_LOGGER=INFO,RFA