<property>
   <name>mapreduce.jobhistory.address</name>
   <value>hadoop5:10020</value>
</property>
<property>
   <name>mapreduce.jobhistory.webapp.address</name>
   <value>hadoop5:19888</value>
</property> 

<!--开启日志聚合-->
<property>
  <name>yarn.log-aggregation-enable</name>
  <value>true</value>
</property>
<!--日志保存时间 单位秒 这里是7天-->
<property> 
  <name>yarn.log-aggregation.retain-seconds</name>
  <value>604800</value>
</property>

mr-jobhistory-daemon.sh start historyserver