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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html">Encrypted Shuffle</a> |
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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/SharedCacheSupport.html">Support for YARN Shared Cache</a> |
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| <h5>MapReduce REST APIs</h5> |
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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a> |
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| <h5>YARN</h5> |
| <ul> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/FairScheduler.html">Fair Scheduler</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a> |
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| <li class="none"> |
| <a href="../../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a> |
| </li> |
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| <h5>YARN REST APIs</h5> |
| <ul> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a> |
| </li> |
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| <h5>YARN Service</h5> |
| <ul> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a> |
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| <h5>Hadoop Compatible File Systems</h5> |
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| <a href="../../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a> |
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| <a href="../../hadoop-azure/index.html">Azure Blob Storage</a> |
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| <a href="../../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a> |
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| <a href="../../hadoop-openstack/index.html">OpenStack Swift</a> |
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| <a href="../../hadoop-cos/cloud-storage/index.html">Tencent COS</a> |
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| <h5>Auth</h5> |
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| <a href="../../hadoop-auth/Examples.html">Examples</a> |
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| <h5>Tools</h5> |
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| <a href="../../hadoop-distcp/DistCp.html">DistCp</a> |
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| <a href="../../hadoop-gridmix/GridMix.html">GridMix</a> |
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| <a href="../../hadoop-rumen/Rumen.html">Rumen</a> |
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| <a href="../../hadoop-resourceestimator/ResourceEstimator.html">Resource Estimator Service</a> |
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| <a href="../../hadoop-sls/SchedulerLoadSimulator.html">Scheduler Load Simulator</a> |
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| <a href="../../hadoop-project-dist/hadoop-common/Benchmarking.html">Hadoop Benchmarking</a> |
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| <a href="../../hadoop-dynamometer/Dynamometer.html">Dynamometer</a> |
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| <h5>Reference</h5> |
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| <a href="../../hadoop-project-dist/hadoop-common/Metrics.html">Metrics</a> |
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| <h5>Configuration</h5> |
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| <a href="../../hadoop-project-dist/hadoop-common/core-default.xml">core-default.xml</a> |
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| <a href="../../hadoop-project-dist/hadoop-hdfs/hdfs-default.xml">hdfs-default.xml</a> |
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| <a href="../../hadoop-project-dist/hadoop-hdfs-rbf/hdfs-rbf-default.xml">hdfs-rbf-default.xml</a> |
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| <a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a> |
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| <a href="../../hadoop-yarn/hadoop-yarn-common/yarn-default.xml">yarn-default.xml</a> |
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| <a href="../../hadoop-kms/kms-default.html">kms-default.xml</a> |
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| <a href="../../hadoop-hdfs-httpfs/httpfs-default.html">httpfs-default.xml</a> |
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| <li class="none"> |
| <a href="../../hadoop-project-dist/hadoop-common/DeprecatedProperties.html">Deprecated Properties</a> |
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| <h1>YARN Pluggable Device Framework</h1> |
| <ul> |
| <li><a href="#Introduction">Introduction</a> |
| <ul> |
| <li><a href="#Pain_Points_Of_Current_Device_Plugin">Pain Points Of Current Device Plugin</a></li></ul></li> |
| <li><a href="#Quick_Start">Quick Start</a> |
| <ul> |
| <li><a href="#Prerequisites">Prerequisites</a></li> |
| <li><a href="#Enable_Device_Plugin_Framework">Enable Device Plugin Framework</a></li> |
| <li><a href="#Configure_Sample_Nvidia_GPU_Plugin">Configure Sample Nvidia GPU Plugin</a></li> |
| <li><a href="#Restart_YARN_And_Run_Job">Restart YARN And Run Job</a></li> |
| <li><a href="#NM_API_To_Query_Resource_Allocation">NM API To Query Resource Allocation</a></li></ul></li> |
| <li><a href="#Develop_Your_Own_Plugin">Develop Your Own Plugin</a></li></ul> |
| |
| <div class="section"> |
| <h2><a name="Introduction"></a>Introduction</h2> |
| <p>At present, YARN supports GPU/FPGA device through a native, coupling way. But it’s difficult for a vendor to implement such a device plugin because the developer needs to understand various integration points with YARN and also a deeper understanding YARN internals related to NodeManager.</p> |
| <div class="section"> |
| <h3><a name="Pain_Points_Of_Current_Device_Plugin"></a>Pain Points Of Current Device Plugin</h3> |
| <p>Some of the pain points for current device plugin development and integration are listed below:</p> |
| <ul> |
| |
| <li>At least 6 classes to be implemented (If you wanna support Docker, you’ll implement one more “DockerCommandPlugin”).</li> |
| <li>When implementing the “ResourceHandler” interface, the developer must understand the YARN NM internal concepts like container launch mechanism, cgroups operations, docker runtime operations.</li> |
| <li>If one wants isolation, the native container-executor also need a new module written in C language.</li> |
| </ul> |
| <p>This brings burdens to the community to maintain both YARN core and vendor-specific code. For more details, check YARN-8851 design document.</p> |
| <p>Based on the above reasons and in order for YARN and vendor-specific plugin to evolve independently, we developed a new pluggable device framework to ease vendor device plugin development and provide a more flexible way to integrate with YARN.</p></div></div> |
| <div class="section"> |
| <h2><a name="Quick_Start"></a>Quick Start</h2> |
| <p>This pluggable device framework not only simplifies the plugin development but also the number of configurations in YARN which are needed for plugin integration. Before we go through how to implement your own device plugin, let’s first see how to use an existing plugin.</p> |
| <p>As an example, the new framework includes a sample implementation of Nvidia GPU plugin supporting detecting Nvidia GPUs, the custom scheduler and isolating containers run with both YARN cgroups and Nvidia Docker runtime v2.</p> |
| <div class="section"> |
| <h3><a name="Prerequisites"></a>Prerequisites</h3> |
| <ol style="list-style-type: decimal"> |
| |
| <li> |
| |
| <p>The pluggable device framework depends on LinuxContainerExecutor to handle resource isolation and Docker stuff. So LCE and Docker enabled on YARN is a must. See <a href="./NodeManagerCgroups.html">Using CGroups with YARN</a> and <a href="./DockerContainers.html">Docker on YARN</a></p> |
| </li> |
| <li> |
| |
| <p>The sample plugin <tt>NvidiaGPUPluginForRuntimeV2</tt> requires Nvidia GPU drivers and Nvidia Docker runtime v2 installed in the nodes. See Nvidia official documents for this.</p> |
| </li> |
| <li> |
| |
| <p>If you use YARN capacity scheduler, below <tt>DominantResourceCalculator</tt> configuration is needed (In <tt>capacity-scheduler.xml</tt>):</p> |
| </li> |
| </ol> |
| |
| <div> |
| <div> |
| <pre class="source"><property> |
| <name>yarn.scheduler.capacity.resource-calculator</name> |
| <value>org.apache.hadoop.yarn.util.resource.DominantResourceCalculator</value> |
| </property> |
| </pre></div></div> |
| </div> |
| <div class="section"> |
| <h3><a name="Enable_Device_Plugin_Framework"></a>Enable Device Plugin Framework</h3> |
| <p>Two properties to enable the pluggable framework support. First one is in <tt>yarn-site.xml</tt>:</p> |
| |
| <div> |
| <div> |
| <pre class="source"><property> |
| <name>yarn.nodemanager.pluggable-device-framework.enabled</name> |
| <value>true</value> |
| </property> |
| </pre></div></div> |
| |
| <p>And then enable the isolation native module in <tt>container-executor.cfg</tt>:</p> |
| |
| <div> |
| <div> |
| <pre class="source"># The configs below deal with settings for resource handled by pluggable device plugin framework |
| [devices] |
| module.enabled=true |
| # devices.denied-numbers=## Blacklisted devices not permitted to use. The format is comma separated "majorNumber:minorNumber". For instance, "195:1,195:2". Leave it empty means default devices reported by device plugin are all allowed. |
| </pre></div></div> |
| </div> |
| <div class="section"> |
| <h3><a name="Configure_Sample_Nvidia_GPU_Plugin"></a>Configure Sample Nvidia GPU Plugin</h3> |
| <p>The pluggable device framework loads one plugin and talks to it to know which resource name the plugin is handling. And the resource name should be pre-defined in <tt>resource-types.xml</tt>. Here we already know the resource name is <tt>nvidia.com/gpu</tt> from the plugin implementation.</p> |
| |
| <div> |
| <div> |
| <pre class="source"><property> |
| <name>yarn.resource-types</name> |
| <value>nvidia.com/gpu</value> |
| </property> |
| </pre></div></div> |
| |
| <p>After define the resource name handled by the plugin. We can configure the plugin name in `yarn-site.xml now:</p> |
| |
| <div> |
| <div> |
| <pre class="source"><property> |
| <name>yarn.nodemanager.pluggable-device-framework.device-classes</name> |
| <value>org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.com.nvidia.NvidiaGPUPluginForRuntimeV2</value> |
| </property> |
| </pre></div></div> |
| |
| <p>Note that the property value must be a full class name of the plugin.</p></div> |
| <div class="section"> |
| <h3><a name="Restart_YARN_And_Run_Job"></a>Restart YARN And Run Job</h3> |
| <p>After restarting YARN, you should see the <tt>nvidia.com/gpu</tt> resource count displayed while accessing YARN UI2 Overview and NodeManages page or issuing command:</p> |
| |
| <div> |
| <div> |
| <pre class="source">yarn node -list -showDetails |
| </pre></div></div> |
| |
| <p>Then you can run job requesting several <tt>nvidia.com/gpu</tt> as usual:</p> |
| |
| <div> |
| <div> |
| <pre class="source">yarn jar <path/to/hadoop-yarn-applications-distributedshell.jar> \ |
| -jar <path/to/hadoop-yarn-applications-distributedshell.jar> \ |
| -shell_env YARN_CONTAINER_RUNTIME_TYPE=docker \ |
| -shell_env YARN_CONTAINER_RUNTIME_DOCKER_IMAGE=<docker-image-name> \ |
| -shell_command nvidia-smi \ |
| -container_resources memory-mb=3072,vcores=1,nvidia.com/gpu=2 \ |
| -num_containers 2 |
| </pre></div></div> |
| </div> |
| <div class="section"> |
| <h3><a name="NM_API_To_Query_Resource_Allocation"></a>NM API To Query Resource Allocation</h3> |
| <p>When a job run with resource like <tt>nvidia.com/gpu</tt>, you can query a NM node’s resource allocation through below RESTful API. Note that the resource name should be URL encoded format (in this case, “nvidia.com%2Fgpu”).</p> |
| |
| <div> |
| <div> |
| <pre class="source">node:port/ws/v1/node/resources/nvidia.com%2Fgpu |
| </pre></div></div> |
| |
| <p>For instance, use below command to get the JSON format resource allocation:</p> |
| |
| <div> |
| <div> |
| <pre class="source">curl localhost:8042/ws/v1/node/resources/nvidia.com%2Fgpu | jq . |
| </pre></div></div> |
| </div></div> |
| <div class="section"> |
| <h2><a name="Develop_Your_Own_Plugin"></a>Develop Your Own Plugin</h2> |
| <p>Configure an existing plugin is easy. But how about implementing my own one? It’s easy too! See <a href="./DevelopYourOwnDevicePlugin.html">Develop Device Plugin</a></p></div> |
| </div> |
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