config-mapred-site-m1-l.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?> 
<configuration>
    <property>
        <name>mapreduce.map.java.opts</name>
        <value>-Xmx1024M</value>
    </property>

    <property>
        <name>mapreduce.reduce.java.opts</name>
        <value>-Xmx2500M</value>
    </property>

    <property>
        <name>mapred.tasktracker.reduce.tasks.maximum</name>
        <value>2</value>
        <decription>4 (default)  is running out of memory</description>
    </property>

    <property>
        <name>mapred.tasktracker.map.tasks.maximum</name>
        <value>3</value>
        <decription>4 (default)  is producing a lot of out of memory errors</description>
    </property>

</configuration>