hadoop-webapp/src/main/resources/mapred-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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<!-- Put site-specific property overrides in this file. -->

<configuration>
    <property>
        <name>mapred.job.tracker</name>
        <value>localhost:41021</value>
    </property>

    <property>
        <name>mapred.tasktracker.map.tasks.maximum</name>
        <value>2</value>
        <description>The maximum number of map tasks that will be run
            simultaneously by a task tracker.
        </description>
    </property>

    <property>
        <name>mapred.tasktracker.reduce.tasks.maximum</name>
        <value>1</value>
        <description>The maximum number of reduce tasks that will be run
            simultaneously by a task tracker.
        </description>
    </property>

    <property>
        <name>mapreduce.jobtracker.staging.root.dir</name>
        <value>/user</value>
    </property>

    <property>
      <name>mapred.job.tracker.http.address</name>
      <value>0.0.0.0:41130</value>
      <description>
        The job tracker http server address and port the server will listen on.
        If the port is 0 then the server will start on a free port.
      </description>
    </property>

    <property>
      <name>mapred.task.tracker.http.address</name>
      <value>0.0.0.0:41160</value>
      <description>
        The task tracker http server address and port.
        If the port is 0 then the server will start on a free port.
      </description>
    </property>

</configuration>