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<a href="../../hadoop-project-dist/hadoop-hdfs/SLGUserGuide.html">Synthetic Load Generator</a>
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<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSDiskbalancer.html">Disk Balancer</a>
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<h5>MapReduce</h5>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html">Tutorial</a>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredCommands.html">Commands Reference</a>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduce_Compatibility_Hadoop1_Hadoop2.html">Compatibility with 1.x</a>
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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/PluggableShuffleAndPluggableSort.html">Pluggable Shuffle/Sort</a>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html">Distributed Cache Deploy</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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</ul>
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<h5>MapReduce REST APIs</h5>
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<ul>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a>
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<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html">MR History Server</a>
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<h5>YARN</h5>
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<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/YarnCommands.html">Commands Reference</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html">Capacity Scheduler</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/ResourceManagerRestart.html">ResourceManager Restart</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a>
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<li class="none">
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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/YarnApplicationSecurity.html">YARN Application Security</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
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<a href="../../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
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<li class="none">
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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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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a>
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</li>
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</ul>
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<h5>YARN REST APIs</h5>
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<ul>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a>
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</li>
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<li class="none">
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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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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a>
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</li>
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</ul>
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<h5>YARN Service</h5>
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<ul>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a>
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</li>
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<li class="none">
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<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a>
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</li>
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</ul>
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<h5>Hadoop Compatible File Systems</h5>
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<ul>
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<li class="none">
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<a href="../../hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a>
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</li>
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<li class="none">
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<a href="../../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a>
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</li>
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<li class="none">
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<a href="../../hadoop-azure/index.html">Azure Blob Storage</a>
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</li>
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<li class="none">
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<a href="../../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a>
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</li>
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<li class="none">
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<a href="../../hadoop-cos/cloud-storage/index.html">Tencent COS</a>
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</li>
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<li class="none">
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<a href="../../hadoop-huaweicloud/cloud-storage/index.html">Huaweicloud OBS</a>
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</li>
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</ul>
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<!---
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. See accompanying LICENSE file.
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<h1>NUMA</h1>
|
|
<p>Non-uniform memory access (NUMA) is a computer memory design used in multiprocessing, where the memory access time depends on the memory location relative to the processor. Under NUMA, a processor can access its own local memory faster than non-local memory (memory local to another processor or memory shared between processors). Yarn Containers can make benefit of this NUMA design to get better performance by binding to a specific NUMA node and all subsequent memory allocations will be served by the same node, reducing remote memory accesses. NUMA support for YARN Container has to be enabled only if worker node machines has NUMA support.</p>
|
|
<h1>Enabling NUMA</h1><section><section>
|
|
<h3><a name="Prerequisites"></a>Prerequisites</h3>
|
|
<ul>
|
|
|
|
<li>As of now, NUMA awareness works only with <code>LinuxContainerExecutor</code> (LCE)</li>
|
|
<li>To use the feature of NUMA awareness in the cluster,It must be enabled with LinuxContainerExecutor (LCE)</li>
|
|
<li>Steps to enable SecureContainer (LCE) for cluster is documented <a href="SecureContainer.html">here</a></li>
|
|
</ul></section></section><section>
|
|
<h2><a name="Configurations"></a>Configurations</h2>
|
|
<p><b>1) Enable/Disable the NUMA awareness</b></p>
|
|
<p>This property enables the NUMA awareness feature in the Node Manager for the containers. By default, the value of this property is false which means it is disabled. If this property is <code>true</code> then only the below configurations will be applicable otherwise they will be ignored.</p>
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.enabled</name>
|
|
<value>true</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p><b>2) NUMA topology</b></p>
|
|
<p>This property decides whether to read the NUMA topology from the system or from the configurations. If this property value is true then the topology will be read from the system using <code>numactl --hardware</code> command in UNIX systems and similar way in windows. If this property is false then the topology will be read using the below configurations. Default value of this configuration is false which means NodeManager will read the NUMA topology from the below configurations.</p>
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.read-topology</name>
|
|
<value>false</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p><b>3) Numa command</b></p>
|
|
<p>This property is passed when <code>yarn.nodemanager.numa-awareness.read-topology</code> is set to true. It is recommended to verify the installation of <code>numactl</code> command in the Linux OS of every node.</p>
|
|
<p>Use <code>/usr/bin/numactl --hardware</code> to verify. Sample output of <code>/usr/bin/numactl --hardware</code></p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre>available: 2 nodes (0-1)
|
|
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
|
|
node 0 size: 191297 MB
|
|
node 0 free: 186539 MB
|
|
node 1 cpus: 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
|
|
node 1 size: 191383 MB
|
|
node 1 free: 185914 MB
|
|
node distances:
|
|
node 0 1
|
|
0: 10 21
|
|
1: 21 10
|
|
</pre></div></div>
|
|
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.numactl.cmd</name>
|
|
<value>/usr/bin/numactl</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p><b>4) NUMA nodes id’s</b></p>
|
|
<p>This property is used to provide the NUMA node ids as comma separated values.It will be read only when the <code>yarn.nodemanager.numa-awareness.read-topology</code> is false.</p>
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.node-ids</name>
|
|
<value>0,1</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p><b>5) NUMA Node memory</b></p>
|
|
<p>This property will be used to read the memory(in MB) configured for each NUMA node specified in <code>yarn.nodemanager.numa-awareness.node-ids</code> by substituting the node id in the place of <code><NODE_ID></code>.It will be read only when the <code>yarn.nodemanager.numa-awareness.read-topology</code> is false.</p>
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.<NODE_ID>.memory</name>
|
|
<value>191297</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p>The value passed is the per node memory available , from the above sample output of <code>numactl --hardware</code> the value passed for the property is the memory available i.e <code>191297</code></p>
|
|
<p><b>6) NUMA Node CPUs</b></p>
|
|
<p>This property will be used to read the number of CPUs configured for each node specified in <code>yarn.nodemanager.numa-awareness.node-ids</code> by substituting the node id in the place of <code><NODE_ID></code>.It will be read only when the <code>yarn.nodemanager.numa-awareness.read-topology</code> is false.</p>
|
|
<p>In <code>yarn-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>yarn.nodemanager.numa-awareness.<NODE_ID>.cpus</name>
|
|
<value>48</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<p>referring to the <code>numactl --hardware</code> output , number of cpu’s in a node is <code>48</code>.</p>
|
|
<p><b>7) Passing java_opts for map/reduce</b></p>
|
|
<p>Every container has to be aware of NUMA and the JVM can be notified via passing NUMA flag. Spark, Tez and other YARN Applications also need to set the container JVM Opts to leverage NUMA Support.</p>
|
|
<p>In <code>mapred-site.xml</code> add</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre> <property>
|
|
<name>mapreduce.reduce.java.opts</name>
|
|
<value>-XX:+UseNUMA</value>
|
|
</property>
|
|
<property>
|
|
<name>mapreduce.map.java.opts</name>
|
|
<value>-XX:+UseNUMA</value>
|
|
</property>
|
|
</pre></div></div>
|
|
|
|
<h1>Default configuration</h1>
|
|
<table border="0" class="bodyTable">
|
|
<thead>
|
|
|
|
<tr class="a">
|
|
<th> Property </th>
|
|
<th> Default value </th></tr>
|
|
</thead><tbody>
|
|
|
|
<tr class="b">
|
|
<td>yarn.nodemanager.numa-awareness.enabled</td>
|
|
<td>false</td></tr>
|
|
<tr class="a">
|
|
<td>yarn.nodemanager.numa-awareness.read-topology</td>
|
|
<td>false</td></tr>
|
|
</tbody>
|
|
</table>
|
|
<h1>Enable numa balancing at OS Level (Optional)</h1>
|
|
<p>In linux, by default numa balancing is by default off. For more performance improvement, NumaBalancing can be turned on for all the nodes in cluster</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre>echo 1 | sudo tee /proc/sys/kernel/numa_balancing
|
|
</pre></div></div>
|
|
|
|
<h1>Verify</h1>
|
|
<p><b>1) NodeManager log</b></p>
|
|
<p>In any of the NodeManager, grep log file using below command</p>
|
|
<p><code>grep "NUMA resources allocation is enabled," *</code></p>
|
|
<p>Sample log with <code>LinuxContainerExecutor</code> enabled message</p>
|
|
|
|
<div class="source">
|
|
<div class="source">
|
|
<pre><nodemanager_ip>.log.2022-06-24-19.gz:2022-06-24 19:16:40,178 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources.numa.NumaResourceHandlerImpl (main): NUMA resources allocation is enabled, initializing NUMA resources allocator.
|
|
</pre></div></div>
|
|
|
|
<p><b>2) Container Log</b></p>
|
|
<p>Grep the NodeManager log using below grep command to check if a container is assigned with NUMA node resources.</p>
|
|
<p><code>grep "NUMA node" | grep <container_id></code></p></section>
|
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</div>
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