<!-- 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>

 

<!-- ResourceManager处理调度器请求的线程数量,默认50；如果提交的任务数大于50，可以增加该值，但是不能超过3台 * 4线程 = 12线程（去除其他应用程序实际不能超过8） -->

<property>

    <description>Number of threads to handle scheduler interface.</description>

    <name>yarn.resourcemanager.scheduler.client.thread-count</name>

    <value>8</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 as

    hyperthreads) 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-as-cores</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>