hadoop集群部署后，遇到的问题记录

  <property>
        <name>mapred.job.tracker</name>  
        <value>http://master:9001</value>
    </property>
    <property>
        <name>mapred.system.dir</name>  
        <value>/opt/hadoop/mapred/system</value>
    </property>
    <property>
        <name>mapred.local.dir</name>  
        <value>/opt/hadoop/mapred/local</value>
    </property>

    <property>
        <name>mapred.jobhistory.address</name>

        <value>http://master:10020</value>

    </property>

    <property>

        <name>mapred.jobhistory.webapp.address</name>

        <value>http://master:19888</value>

    </property>
    <property>
        <name>mapred.jotracker.address</name>
        <value>http://master:9090</value>
    </property>