MapReduce

# export JAVA_HOME=/home/y/libexec/jdk1.8.0/

​

      export HADOOP_JOB_HISTORYSERVER_HEAPSIZE={{jobhistory_heapsize}}

​

      # We need to add the RFA appender for the mr daemons only;

      # however, HADOOP_MAPRED_LOGGER is shared by the mapred client and the

      # daemons. This will restrict the RFA appender to daemons only.

      export HADOOP_LOGLEVEL=${HADOOP_LOGLEVEL:-INFO}

      export HADOOP_ROOT_LOGGER=${HADOOP_ROOT_LOGGER:-INFO,console}

      export HADOOP_DAEMON_ROOT_LOGGER=${HADOOP_DAEMON_ROOT_LOGGER:-${HADOOP_LOGLEVEL},RFA}

​

      {% if security_enabled %}

      export MAPRED_HISTORYSERVER_OPTS="-Djava.security.auth.login.config={{mapred_jaas_file}}  -Djavax.security.auth.useSubjectCredsOnly=false"

      {% endif %}

      {% if java_version|int > 11 %}

      export MAPRED_HISTORYSERVER_OPTS="$MAPRED_HISTORYSERVER_OPTS {{jvm_flags}}"

      {% endif %}

​

      #export HADOOP_JHS_LOGGER=INFO,RFA # Hadoop JobSummary logger.

      #export HADOOP_IDENT_STRING= #A string representing this instance of hadoop. $USER by default

      #export HADOOP_NICENESS= #The scheduling priority for daemons. Defaults to 0.

      export HADOOP_OPTS="-Dodp.version=$ODP_VERSION $HADOOP_OPTS"

      export HADOOP_OPTS="-Djava.io.tmpdir={{hadoop_java_io_tmpdir}} {{jvm_flags}} $HADOOP_OPTS"

      export JAVA_LIBRARY_PATH="${JAVA_LIBRARY_PATH}:{{hadoop_java_io_tmpdir}}"

​

      # History server logs

      export HADOOP_LOG_DIR={{mapred_log_dir_prefix}}/$USER

​

      # History server pid

      export HADOOP_PID_DIR={{mapred_pid_dir_prefix}}/$USER