Hadoop中编辑mapred-site.xml文件的操作步骤以及代码分别是什么？

<configuration>
<property>
      <name>mapreduce.framework.name</name>
      <value>yarn</value>
</property>
<property>
      <name>mapreduce.jobhistory.address</name>
      <value>0.0.0.0:10020</value>
      <description>MapReduce JobHistory Server IPC host:port</description>
</property>
<property>
      <name>mapreduce.jobhistory.webapp.address</name>
      <value>0.0.0.0:19888</value>
      <description>MapReduce JobHistory Server Web UI host:port</description>
</property>
<property>
      <name>mapreduce.task.io.sort.mb</name>
      <value>1</value>
</property>
<property>
      <name>yarn.app.mapreduce.am.staging-dir</name>
      <value>/user</value>
</property>
<property>
      <name>mapreduce.jobhistory.intermediate-done-dir</name>
      <value>/user/history/done_intermediate</value>
</property>
<property>
      <name>mapreduce.jobhistory.done-dir</name>
      <value>/user/history</value>
</property>
</configuration>    

告诉hadoop以后MR(Map/Reduce)运行在YARN上