<configuration>
    <!-- Site specific YARN configuration properties -->
    
    <!-- 指定YARN的主角色（ResourceManager）的地址 -->
    <property>
        <name>yarn.resourcemanager.hostname</name>
        <value>hadoop001</value>
    </property>

    <!-- NodeManager上运行的附属服务，需配置成mapreduce_shuffle以支持MapReduce -->
    <!-- 默认为："--" -->
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>

    <!-- Yarn集群内存分配相关配置 -->
    <property>
        <name>yarn.nodemanager.resource.memory-mb</name>
        <value>20480</value>
    </property>
    <property>
        <name>yarn.scheduler.minimum-allocation-mb</name>
        <value>2048</value>
    </property>
    <property>
        <name>yarn.nodemanager.vmem-pmem-ratio</name>
        <value>2.1</value>
    </property>

    <!-- 容器资源限制开关 -->
    <property>
        <name>yarn.nodemanager.pmem-check-enabled</name>
        <value>false</value>
    </property>
    <property>
        <name>yarn.nodemanager.vmem-check-enabled</name>
        <value>false</value>
    </property>

    <!-- 日志聚集相关配置 -->
    <property>
        <name>yarn.log-aggregation-enable</name>
        <value>true</value>
    </property>
    <property>
        <name>yarn.log.server.url</name>
        <value>http://hadoop001:19888/jobhistory/logs</value>
    </property>
    <property>
        <name>yarn.log-aggregation.retain-seconds</name>
        <value>604800</value>
    </property>
</configuration>