<!-- 开启日志聚集功能 -->
<property>
<name>yarn.log-aggregation-enable</name>
<value>true</value>
</property>
<!-- 设置日志聚集服务器地址 -->
<property>
<name>yarn.log.server.url</name>
<value>http://hadoop102:19888/jobhistory/logs</value>
</property>
<!-- 设置日志保留时间为 7 天 -->
<property>
<name>yarn.log-aggregation.retain-seconds</name>
<value>604800</value>
</property>
xsync
##在yarn启动机器上
sbin/stop-yarn.sh
mapred --daemon stop historyserver
start-yarn.sh
mapred --daemon start historyserver
hadoop fs -rm -r /output
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.3.jar wordcount /input /output
原文:https://www.cnblogs.com/zhy-god/p/14984214.html