{"id":2401,"date":"2017-05-01T10:25:28","date_gmt":"2017-05-01T10:25:28","guid":{"rendered":"http:\/\/data-flair.training\/blogs\/?p=2401"},"modified":"2018-11-16T14:36:19","modified_gmt":"2018-11-16T09:06:19","slug":"hadoop-2-6-multinode-cluster-setup","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/hadoop-2-6-multinode-cluster-setup\/","title":{"rendered":"Hadoop 2.6 Multi Node Cluster Setup and Hadoop Installation"},"content":{"rendered":"<div class='__iawmlf-post-loop-links' style='display:none;' data-iawmlf-post-links='[{&quot;id&quot;:2360,&quot;href&quot;:&quot;http:\\\/\\\/archive.cloudera.com\\\/cdh5\\\/cdh\\\/5\\\/hadoop-2.5.0-cdh5.3.2.tar.gz&quot;,&quot;archived_href&quot;:&quot;&quot;,&quot;redirect_href&quot;:&quot;https:\\\/\\\/archive.cloudera.com\\\/cdh5\\\/cdh\\\/5\\\/hadoop-2.5.0-cdh5.3.2.tar.gz&quot;,&quot;checks&quot;:[],&quot;broken&quot;:false,&quot;last_checked&quot;:null,&quot;process&quot;:&quot;done&quot;},{&quot;id&quot;:2361,&quot;href&quot;:&quot;https:\\\/\\\/hadoop.apache.org\\\/docs\\\/current\\\/hadoop-project-dist\\\/hadoop-common\\\/ClusterSetup.html&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20250615203854\\\/https:\\\/\\\/hadoop.apache.org\\\/docs\\\/current\\\/hadoop-project-dist\\\/hadoop-common\\\/ClusterSetup.html&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2025-12-11 04:28:24&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-14 04:32:40&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-17 05:24:15&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-22 11:30:42&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2025-12-29 12:50:26&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-03 08:27:49&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-14 04:41:20&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-21 23:11:46&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-01-29 16:33:11&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-03 02:35:30&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-11 11:48:18&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-20 18:56:58&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-02-25 09:02:32&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-03 07:48:25&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-09 03:51:20&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-18 13:13:21&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-03-23 21:25:20&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-12 04:27:30&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-04-18 15:02:20&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-06 09:11:01&quot;,&quot;http_code&quot;:206},{&quot;date&quot;:&quot;2026-05-24 13:32:03&quot;,&quot;http_code&quot;:206}],&quot;broken&quot;:false,&quot;last_checked&quot;:{&quot;date&quot;:&quot;2026-05-24 13:32:03&quot;,&quot;http_code&quot;:206},&quot;process&quot;:&quot;done&quot;}]'><\/div>\n<h2>1. Hadoop 2.6 Multi Node Cluster Setup Tutorial &#8211; Objective<\/h2>\n<p>In this tutorial on Install<a href=\"http:\/\/data-flair.training\/blogs\/hadoop-introduction-tutorial-quick-guide\/\"><strong> Hadoop<\/strong><\/a> 2.6 Multi node cluster setup on Ubuntu, we will learn how to install a Hadoop 2.6 multi-node cluster setup with <strong><a href=\"http:\/\/data-flair.training\/blogs\/hadoop-yarn-tutorial\/\">YARN<\/a><\/strong>. We will learn various steps for Hadoop 2.6 installing on Ubuntu to setup Hadoop multi-node cluster. We will start with platform requirements for Hadoop 2.6\u00a0 Multi Node Cluster Setup on Ubuntu, prerequisites to install Hadoop on master and slave, various software required for installing Hadoop, how to start Hadoop cluster and how to stop Hadoop cluster. It will also cover how to install Hadoop CDH5 to help you in programming in Hadoop.<\/p>\n<div id=\"attachment_42357\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-42357\" class=\"size-full wp-image-42357\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu.jpg\" alt=\"Hadoop 2.6 Multi Node Cluster Setup and Hadoop Installation\" width=\"1200\" height=\"628\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu.jpg 1200w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu-150x79.jpg 150w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu-300x157.jpg 300w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu-768x402.jpg 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu-1024x536.jpg 1024w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2017\/05\/hadoop-2.x-instalaltion-on-ubuntu-520x272.jpg 520w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><p id=\"caption-attachment-42357\" class=\"wp-caption-text\">Hadoop 2.6 Multi Node Cluster Setup and Hadoop Installation<\/p><\/div>\n<h2>2. Hadoop 2.6 Multi Node Cluster Setup<\/h2>\n<p>Let us now start with steps to setup Hadoop multi-node cluster in Ubuntu. Let us first understand the recommended platform for installing Hadoop on the multi-node cluster in Ubuntu.<\/p>\n<h3>2.1. Recommended Platform for Hadoop 2.6 Multi Node Cluster Setup<\/h3>\n<ul>\n<li><strong>OS: <a href=\"http:\/\/data-flair.training\/blogs\/frequent-linux-commands-beginners-tutorial\/\">Linux<\/a><\/strong> is supported as a development and production platform. You can use Ubuntu 14.04 or 16.04 or later (you can also use other Linux flavors like CentOS, Redhat, etc.)<\/li>\n<li><strong>Hadoop:<\/strong> Cloudera Distribution for Apache Hadoop CDH5.x (you can use Apache Hadoop 2.x)<\/li>\n<\/ul>\n<h3>2.2. Install Hadoop on Master<\/h3>\n<p>Let us now start with installing Hadoop on master node in the distributed mode.<\/p>\n<h4>I. Prerequisites for Hadoop 2.6 Multi Node Cluster Setup<\/h4>\n<p>Let us now start with learning the prerequisites to install Hadoop:<br \/>\n<strong>a. Add Entries in hosts file<\/strong><br \/>\nEdit hosts file and add entries of master and slaves:<br \/>\n[php]sudo nano \/etc\/hosts<br \/>\nMASTER-IP\u00a0master<br \/>\nSLAVE01-IP\u00a0slave01<br \/>\nSLAVE02-IP\u00a0slave02[\/php]<br \/>\n<em>(NOTE: In place of MASTER-IP, SLAVE01-IP, SLAVE02-IP put the value of the corresponding IP)<\/em><br \/>\n<strong>b. Install Java 8 (Recommended Oracle Java)<\/strong><\/p>\n<ul>\n<li><strong>Install Python Software Properties<\/strong><\/li>\n<\/ul>\n<p>[php]sudo apt-get install python-software-properties[\/php]<\/p>\n<ul>\n<li><strong>Add Repository<\/strong><\/li>\n<\/ul>\n<p>[php]sudo add-apt-repository ppa:webupd8team\/java[\/php]<\/p>\n<ul>\n<li><strong>Update the source list<\/strong><\/li>\n<\/ul>\n<p>[php]sudo apt-get update[\/php]<\/p>\n<ul>\n<li><strong>Install Java<\/strong><\/li>\n<\/ul>\n<p>[php]sudo apt-get install oracle-java8-installer[\/php]<br \/>\n<strong>c. Configure SSH<\/strong><\/p>\n<ul>\n<li><strong>Install Open SSH Server-Client<\/strong><\/li>\n<\/ul>\n<p>[php]sudo apt-get install openssh-server openssh-client[\/php]<\/p>\n<ul>\n<li><strong>Generate Key Pairs<\/strong><\/li>\n<\/ul>\n<p>[php]ssh-keygen -t rsa -P &#8220;&#8221;[\/php]<\/p>\n<ul>\n<li><strong>Configure passwordless SSH<\/strong><\/li>\n<\/ul>\n<p>Copy the content of .ssh\/id_rsa.pub (of master) to .ssh\/authorized_keys (of all the slaves as well as master)<\/p>\n<ul>\n<li><strong style=\"font-family: Verdana, Geneva, sans-serif\">Check by SSH to <\/strong><strong style=\"font-family: Verdana, Geneva, sans-serif\">all the Slaves<\/strong><\/li>\n<\/ul>\n<p>[php]ssh slave01<br \/>\nssh slave02[\/php]<\/p>\n<h4>II. Install Apache Hadoop in distributed mode<\/h4>\n<p>Let us now learn how to download and install Hadoop?<br \/>\n<strong>a. Download Hadoop<\/strong><br \/>\nBelow is the link to download Hadoop 2.x.<br \/>\n<a href=\"http:\/\/archive.cloudera.com\/cdh5\/cdh\/5\/hadoop-2.5.0-cdh5.3.2.tar.gz\">http:\/\/archive.cloudera.com\/cdh5\/cdh\/5\/hadoop-2.5.0-cdh5.3.2.tar.gz<\/a><br \/>\n<strong>b. Untar Tarball<\/strong><br \/>\n[php]tar xzf hadoop-2.5.0-cdh5.3.2.tar.gz[\/php]<br \/>\n<em>(Note: All the required jars, scripts, configuration files, etc. are available in HADOOP_HOME directory (hadoop-2.5.0-cdh5.3.2))<\/em><\/p>\n<h4>III. Hadoop multi-node cluster setup Configuration<\/h4>\n<p>Let us now learn how to setup Hadoop configuration while installing Hadoop?<br \/>\n<strong>a. Edit .bashrc<\/strong><br \/>\nEdit .bashrc file located in user\u2019s home directory and add following environment variables:<br \/>\n[php]export HADOOP_PREFIX=&#8221;\/home\/ubuntu\/hadoop-2.5.0-cdh5.3.2&#8243;<br \/>\nexport PATH=$PATH:$HADOOP_PREFIX\/bin<br \/>\nexport PATH=$PATH:$HADOOP_PREFIX\/sbin<br \/>\nexport HADOOP_MAPRED_HOME=${HADOOP_PREFIX}<br \/>\nexport HADOOP_COMMON_HOME=${HADOOP_PREFIX}<br \/>\nexport HADOOP_HDFS_HOME=${HADOOP_PREFIX}<br \/>\nexport YARN_HOME=${HADOOP_PREFIX}[\/php]<br \/>\n<em>(Note: After above step restart the Terminal\/Putty so that all the environment variables will come into effect)<\/em><br \/>\n<strong>b. Check environment variables<\/strong><br \/>\nCheck whether the environment variables added in the .bashrc file are available:<br \/>\n[php]bash<br \/>\nhdfs[\/php]<br \/>\n<em>(It should not give error: command not found)<\/em><br \/>\n<strong>c. Edit hadoop-env.sh<\/strong><br \/>\nEdit configuration file hadoop-env.sh (located in HADOOP_HOME\/etc\/hadoop) and set JAVA_HOME:<br \/>\n[php]export JAVA_HOME=&lt;path-to-the-root-of-your-Java-installation&gt; (eg: \/usr\/lib\/jvm\/java-8-oracle\/)[\/php]<br \/>\n<strong>d. Edit core-site.xml<\/strong><br \/>\nEdit configuration file core-site.xml (located in HADOOP_HOME\/etc\/hadoop) and add following entries:<br \/>\n[php]&lt;configuration&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;fs.defaultFS&lt;\/name&gt;<br \/>\n&lt;value&gt;hdfs:\/\/master:9000&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;hadoop.tmp.dir&lt;\/name&gt;<br \/>\n&lt;value&gt;\/home\/ubuntu\/hdata&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;\/configuration&gt;[\/php]<br \/>\n<em>Note: \/home\/ubuntu\/hdata is a sample location; please specify a location where you have Read Write privileges<\/em><br \/>\n<strong>e. Edit hdfs-site.xml<\/strong><br \/>\nEdit configuration file hdfs-site.xml (located in HADOOP_HOME\/etc\/hadoop) and add following entries:<br \/>\n[php]&lt;configuration&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;dfs.replication&lt;\/name&gt;<br \/>\n&lt;value&gt;2&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;\/configuration&gt;[\/php]<br \/>\n<strong>f. Edit mapred-site.xml<\/strong><br \/>\nEdit configuration file mapred-site.xml (located in HADOOP_HOME\/etc\/hadoop) and add following entries:<br \/>\n[php]&lt;configuration&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;mapreduce.framework.name&lt;\/name&gt;<br \/>\n&lt;value&gt;yarn&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;\/configuration&gt;[\/php]<br \/>\n<strong>g. Edit yarn-site.xml<\/strong><br \/>\nEdit configuration file mapred-site.xml (located in HADOOP_HOME\/etc\/hadoop) and add following entries:<br \/>\n[php]&lt;configuration&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;yarn.nodemanager.aux-services&lt;\/name&gt;<br \/>\n&lt;value&gt;mapreduce_shuffle&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;yarn.nodemanager.aux-services.mapreduce.shuffle.class&lt;\/name&gt;<br \/>\n&lt;value&gt;org.apache.hadoop.mapred.ShuffleHandler&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;yarn.resourcemanager.resource-tracker.address&lt;\/name&gt;<br \/>\n&lt;value&gt;master:8025&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;yarn.resourcemanager.scheduler.address&lt;\/name&gt;<br \/>\n&lt;value&gt;master:8030&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;property&gt;<br \/>\n&lt;name&gt;yarn.resourcemanager.address&lt;\/name&gt;<br \/>\n&lt;value&gt;master:8040&lt;\/value&gt;<br \/>\n&lt;\/property&gt;<br \/>\n&lt;\/configuration&gt;[\/php]<br \/>\n<strong>h. Edit salves<\/strong><br \/>\nEdit configuration file slaves (located in HADOOP_HOME\/etc\/hadoop) and add following entries:<br \/>\n[php]slave01<br \/>\nslave02[\/php]<br \/>\n\u201cHadoop is set up on Master, now setup Hadoop on all the Slaves\u201d<br \/>\nRefer this guide to<a href=\"http:\/\/data-flair.training\/blogs\/hadoop-features-design-principles-tutorial\/\"> learn Hadoop Features and design principles<\/a>.<\/p>\n<h3>2.3. Install Hadoop On Slaves<\/h3>\n<h4>I. Setup Prerequisites on all the slaves<\/h4>\n<p>Run following steps on all the slaves:<\/p>\n<ul>\n<li>Add Entries in hosts file<\/li>\n<li>Install Java 8 (Recommended Oracle Java)<\/li>\n<\/ul>\n<h4>II. Copy configured setups from master to all the slaves<\/h4>\n<p><strong>a. Create tarball of configured setup<\/strong><br \/>\n[php]tar czf hadoop.tar.gz hadoop-2.5.0-cdh5.3.2[\/php]<br \/>\n<em>(NOTE: Run this command on Master)<\/em><br \/>\n<strong>b. Copy the configured tarball on all the slaves<\/strong><br \/>\n[php]scp hadoop.tar.gz slave01:~[\/php]<br \/>\n(NOTE: Run this command on Master)<br \/>\n[php]scp hadoop.tar.gz slave02:~[\/php]<br \/>\n<em>(NOTE: Run this command on Master)<\/em><br \/>\n<strong>c. Un-tar configured Hadoop setup on all the slaves<\/strong><br \/>\n[php]tar xzf hadoop.tar.gz[\/php]<br \/>\n(NOTE: Run this command on all the slaves)<br \/>\n\u201cHadoop is set up on all the Slaves. Now Start the Cluster\u201d<\/p>\n<h3>2.4. Start the Hadoop Cluster<\/h3>\n<p>Let us now learn how to start Hadoop cluster?<\/p>\n<h4>I. Format the name node<\/h4>\n<p>[php]bin\/hdfs namenode -format[\/php]<br \/>\n<em>(Note: Run this command on Master)<\/em><br \/>\n<em>(NOTE: This activity should be done once when you install Hadoop, else it will delete all the data from <a href=\"http:\/\/data-flair.training\/blogs\/apache-hadoop-hdfs-introduction-tutorial\/\">HDFS<\/a>)<\/em><\/p>\n<h4>II. Start HDFS Services<\/h4>\n<p>[php]sbin\/start-dfs.sh[\/php]<br \/>\n<em>(Note: Run this command on Master)<\/em><\/p>\n<h4>III. Start YARN Services<\/h4>\n<p>[php]sbin\/start-yarn.sh[\/php]<br \/>\n<em>(Note: Run this command on Master)<\/em><\/p>\n<h4>IV. Check for Hadoop services<\/h4>\n<p><strong>a. Check daemons on Master<\/strong><br \/>\n[php]jps&lt;\/pre&gt;<br \/>\nNameNode<br \/>\nResourceManager[\/php]<br \/>\n<strong>b. Check daemons on Slaves<\/strong><br \/>\n[php]jps&lt;\/pre&gt;<br \/>\nDataNode<br \/>\nNodeManager[\/php]<\/p>\n<h3>2.5. Stop The Hadoop Cluster<\/h3>\n<p>Let us now see how to stop the Hadoop cluster?<\/p>\n<h4>I. Stop YARN Services<\/h4>\n<p>[php]sbin\/stop-yarn.sh[\/php]<br \/>\n<em>(Note: Run this command on Master)<\/em><\/p>\n<h4>II. Stop HDFS Services<\/h4>\n<p>[php]sbin\/stop-dfs.sh[\/php]<br \/>\n<em>(Note: Run this command on Master)<\/em><br \/>\nThis is how we do Hadoop 2.6 multi node cluster setup on Ubuntu.<br \/>\nAfter learning how to do Hadoop 2.6 multi node cluster setup, follow this comparison guide to get the <a href=\"http:\/\/data-flair.training\/blogs\/difference-comparison-hadoop-2-x-vs-hadoop-3-x\/\">feature wise comparison between Hadoop 2.x vs Hadoop 3.x.<\/a><br \/>\nIf you like this tutorial on Hadoop Multinode Cluster Setup, do let us know in the comment section. Our support team is happy to help you regarding any queries in Hadoop 2.6 multi node cluster setup.<\/p>\n<p><strong>Related Topic &#8211;\u00a0<\/strong><\/p>\n<p><a title=\"Installation of Hadoop 3.x on Ubuntu on Single Node Cluster\" href=\"https:\/\/data-flair.training\/blogs\/installation-of-hadoop-3-x-on-ubuntu\/\">Installation of Hadoop 3.x on Ubuntu on Single Node Cluster<\/a><\/p>\n<p><a title=\"Hadoop NameNode Automatic Failover\" href=\"https:\/\/data-flair.training\/blogs\/hadoop-namenode-automatic-failover\/\">Hadoop NameNode Automatic Failover<\/a><\/p>\n<p><a href=\"https:\/\/hadoop.apache.org\/docs\/current\/hadoop-project-dist\/hadoop-common\/ClusterSetup.html\">Reference<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Hadoop 2.6 Multi Node Cluster Setup Tutorial &#8211; Objective In this tutorial on Install Hadoop 2.6 Multi node cluster setup on Ubuntu, we will learn how to install a Hadoop 2.6 multi-node cluster&#46;&#46;&#46;<\/p>\n","protected":false},"author":6,"featured_media":42357,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[5193,5194,6752,6768],"class_list":["post-2401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hadoop","tag-hadoop-2-x-installation","tag-hadoop-2-x-installation-on-ubuntu","tag-install-and-configure-hadoop-2-x","tag-install-hadoop-2-x"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hadoop 2.6 Multi Node Cluster Setup and Hadoop Installation - DataFlair<\/title>\n<meta name=\"description\" content=\"Hadoop 2.6 multi node cluster setup on ubuntu tutorial covers Installation of Hadoop on multinode cluster, Hadoop multi-node cluster setup Configuration\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/hadoop-2-6-multinode-cluster-setup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hadoop 2.6 Multi Node Cluster Setup and Hadoop Installation - 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