配置日志聚集（伪分布式模式）

配置日志聚集

注意：开启日志聚集功能，需要重新启动NodeManager 、ResourceManager 和 HistoryManager。

配置 yarn-site.xml

[xiaoran@hadoop101 hadoop-2.7.2]$ vim etc/hadoop/yarn-site.xml 

<!-- 日志聚集功能使能 -->
<property>
    <name>yarn.log-aggregation-enable</name>
    <value>true</value>
</property>

<!-- 日志保留时间设置7天 -->
<property>
    <name>yarn.log-aggregation.retain-seconds</name>
    <value>604800</value>
</property>

关闭 NodeManager、ResourceManager、HistoryManager

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/mr-jobhistory-daemon.sh start historyserver

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh stop nodemanager

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh stop resourcemanager

启动 NodeManager、ResourceManager、HistoryManager

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh start resourcemanager

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh start nodemanager

[xiaoran@hadoop101 hadoop-2.7.2]$ sbin/mr-jobhistory-daemon.sh start historyserver