<!-- 选择调度器,默认容量 --> <property> <description>The class to use as the resource scheduler.</description> <name>yarn.resourcemanager.scheduler.class</name> <value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler</value> </property>
<!-- 是否让 yarn 自动检测硬件进行配置,默认是 false,如果该节点有很多其他应用程序, 建议手动配置。如果该节点没有其他应用程序,可以采用自动 --> <property> <description>Enable auto-detection of node capabilities such as memory and CPU.</description> <name>yarn.nodemanager.resource.detect-hardware-capabilities</name> <value>false</value> </property>
<!-- 是否将虚拟核数当作 CPU 核数,默认是 false,采用物理 CPU 核数 --> <property> <description>Flag to determine if logical processors(such ashyperthreads) should be counted as cores. Only applicable on Linux when yarn.nodemanager.resource.cpu-vcores is set to -1 and yarn.nodemanager.resource.detect-hardware-capabilities is true. </description> <name>yarn.nodemanager.resource.count-logical-processors-ascores</name> <value>false</value> </property>
<!-- 虚拟核数和物理核数乘数,默认是 1.0 --> <property> <description>Multiplier to determine how to convert phyiscal cores to vcores. This value is used if yarn.nodemanager.resource.cpu-vcores is set to -1(which implies auto-calculate vcores) and yarn.nodemanager.resource.detect-hardware-capabilities is set to true. The number of vcores will be calculated as number of CPUs * multiplier. </description> <name>yarn.nodemanager.resource.pcores-vcores-multiplier</name> <value>1.0</value> </property>
<!-- NodeManager 使用内存数,默认 8G,修改为 4G 内存 --> <property> <description>Amount of physical memory, in MB, that can be allocated for containers. If set to -1 and yarn.nodemanager.resource.detect-hardware-capabilities is true, it is automatically calculated(in case of Windows and Linux). In other cases, the default is 8192MB. </description> <name>yarn.nodemanager.resource.memory-mb</name> <value>4096</value> </property>
<!-- nodemanager 的 CPU 核数,不按照硬件环境自动设定时默认是 8 个,修改为 4 个 --> <property> <description>Number of vcores that can be allocated for containers. This is used by the RM scheduler when allocating resources for containers. This is not used to limit the number of CPUs used by YARN containers. If it is set to -1 and yarn.nodemanager.resource.detect-hardware-capabilities is true, it is automatically determined from the hardware in case of Windows and Linux. In other cases, number of vcores is 8 by default.</description> <name>yarn.nodemanager.resource.cpu-vcores</name> <value>4</value> </property>
<!-- 容器最小内存,默认 1G --> <property> <description>The minimum allocation for every container request at the RM in MBs. Memory requests lower than this will be set to the value of this property. Additionally, a node manager that is configured to have less memory than this value will be shut down by the resource manager. </description> <name>yarn.scheduler.minimum-allocation-mb</name> <value>1024</value> </property>
<!-- 容器最大内存,默认 8G,修改为 2G --> <property> <description>The maximum allocation for every container request at the RM in MBs. Memory requests higher than this will throw an InvalidResourceRequestException. </description> <name>yarn.scheduler.maximum-allocation-mb</name> <value>2048</value> </property>
<!-- 容器最小 CPU 核数,默认 1 个 --> <property> <description>The minimum allocation for every container request at the RM in terms of virtual CPU cores. Requests lower than this will be set to the value of this property. Additionally, a node manager that is configured to have fewer virtual cores than this value will be shut down by the resource manager. </description> <name>yarn.scheduler.minimum-allocation-vcores</name> <value>1</value> </property>
<!-- 容器最大 CPU 核数,默认 4 个,修改为 2 个 --> <property> <description>The maximum allocation for every container request at the RM in terms of virtual CPU cores. Requests higher than this will throw an InvalidResourceRequestException.</description> <name>yarn.scheduler.maximum-allocation-vcores</name> <value>2</value> </property>
<!-- 虚拟内存检查,默认打开,修改为关闭 --> <property> <description>Whether virtual memory limits will be enforced for containers.</description> <name>yarn.nodemanager.vmem-check-enabled</name> <value>false</value> </property>
<!-- 虚拟内存和物理内存设置比例,默认 2.1 --> <property> <description>Ratio between virtual memory to physical memory when setting memory limits for containers. Container allocations are expressed in terms of physical memory, and virtual memory usage is allowed to exceed this allocation by this ratio. </description> <name>yarn.nodemanager.vmem-pmem-ratio</name> <value>2.1</value> </property>
关闭虚拟内存检查原因
在CentOS7.5中
(4)分发配置。
注意:如果集群的硬件资源不一致,要每个 NodeManager 单独配置
(5)重启集群
(6)执行 WordCount 程序
1
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.3.jar wordcount /input /output
<!-- 指定多队列,增加 hive 队列 --> <property> <name>yarn.scheduler.capacity.root.queues</name> <value>default,hive</value> <description> The queues at the this level (root is the root queue). </description> </property>