Deploy hadoop cluster
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This document provides instructions for setting up a 3-node Hadoop cluster with 1 master node and 2 slave nodes. It describes installing Java, configuring SSH access, downloading and installing Hadoop, editing configuration files, starting HDFS and MapReduce services on the master, and verifying that all Hadoop daemon processes are running as expected on each node.
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July 2010 Triangle Hadoop Users Group - Chad Vawter Slides
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Hadoop introductionChirag Ahuja This document provides an introduction to Hadoop, including its ecosystem, architecture, key components like HDFS and MapReduce, characteristics, and popular flavors. Hadoop is an open source framework that efficiently processes large volumes of data across clusters of commodity hardware. It consists of HDFS for storage and MapReduce as a programming model for distributed processing. A Hadoop cluster typically has a single namenode and multiple datanodes. Many large companies use Hadoop to analyze massive datasets.
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Starbucks in the Indian market through its joint venture.
Starbucks in the Indian market through its joint venture.sales480687 This topic focuses on the growth and challenges of Starbucks in the Indian market through its joint venture with Tata. It covers localization strategies, menu adaptations, expansion goals, and financial performance. The topic also examines consumer perceptions, market competition, and how Starbucks navigates economic and cultural factors in one of its most promising international markets.
Deploy hadoop cluster
- 1. Deploy Hadoop on Cluster Install Hadoop in distributed mode This document explains how to setup Hadoop on real cluster. Here one node will act as master and rest (two) as slave. To get real power of Hadoop Multi-node cluster is used in the productions. In this document we will use 3 machines to deploy Hadoop cluster
- 2. 2 Contents 1. Recommended Platform .................................................................................................................4 2. Prerequisites:.................................................................................................................................4 3. Install java 7 (recommended oracle java) ........................................................................................4 3.1Update the source list.................................................................................................................4 3.2 Install Java: ...............................................................................................................................4 4. Add entry of master and slaves in hosts file:.....................................................................................4 5. Configure SSH.................................................................................................................................4 5.1 Install Open SSH Server-Client....................................................................................................4 5.2 Generate key pairs ....................................................................................................................4 5.3 Configure password-less SSH......................................................................................................4 5.4 Check by SSH to slaves...............................................................................................................5 5. Download Hadoop..........................................................................................................................5 5.1 Download Hadoop.....................................................................................................................5 6. Install Hadoop................................................................................................................................5 6.1 Untar Tar ball............................................................................................................................5 6.2 Go to HADOOP_HOME_DIR........................................................................................................5 7. Setup Configuration:.......................................................................................................................5 7.1 Edit configuration file conf/hadoop-env.sh and set JAVA_HOME..................................................5 7.2 Edit configuration file conf/core-site.xml and add following entries:.............................................5 7.3 Edit configuration file conf/hdfs-site.xml and add following entries:.............................................5 7.4 Edit configuration file conf/mapred-site.xml and add following entries:........................................6 7.5 Edit configuration file conf/masters and add entry of secondary-master.......................................6 7.6 Edit configuration file conf/slaves and add entry of slaves ...........................................................6 7.7 Set environment variables .........................................................................................................6 8. Setup Hadoop on slaves..................................................................................................................6 8.1 Repeat the step-3 and step-4 on all the slaves.............................................................................6 8.2 Create tar ball of configured Hadoop-setup and copy to all the slaves: .........................................6 8.3 Untar configured Hadoop-setup on all the slaves ........................................................................6 9. Start The Cluster.............................................................................................................................6 9.1 Format the name node:.............................................................................................................6 9.2 Now start Hadoop services.........................................................................................................7 9.2.1 Start HDFS services .............................................................................................................7
- 3. 3 9.2.2 Start Map-Reduce services ..................................................................................................7 9.3. Check daemons status, by running jps command:.......................................................................7 9.3.1 On master ..........................................................................................................................7 9.3.2 On slaves-01:......................................................................................................................7 9.3.3 On slaves-02:......................................................................................................................7 10. Stop the cluster ............................................................................................................................7 10.1 Stop mapreduce services .........................................................................................................7 10.2 Stop HDFS services ..................................................................................................................7
- 4. 4 1. Recommended Platform • OS: Ubuntu 12.04 or later (you can use other OS (cent OS, Redhat, etc)) • Hadoop: Cloudera distribution for Apache hadoop CDH3U6 (you can use Apache hadoop (0.20.X / 1.X)) 2. Prerequisites: • Java (oracle java is recommended for production) • Password-less SSH setup (Hadoop need passwordless ssh from master to all the slaves, this is required for remote script invocations) Run following commands on the Master of Hadoop Cluster 3. Install java 7 (recommended oracle java) 3.1Update the source list sudo apt-get update sudo apt-get install python- software-properties sudo add-apt-repository ppa:webupd8team/java sudo apt-get update 3.2 Install Java: sudo apt-get install oracle-java7-installer 4. Add entry of master and slaves in hosts file: Edit hosts file and following add entries sudo nano /etc/hosts MASTER-IP master SLAVE01-IP slave-01 SLAVE02-IP slave-02 (In place of MASTER-IP, SLAVE01-IP, SLAVE02-IP put the value of corresponding IP) 5. Configure SSH 5.1 Install Open SSH Server-Client sudo apt-get install openssh-server openssh-client 5.2 Generate key pairs ssh-keygen -t rsa -P "" 5.3 Configure password-less SSH Copy the contents of “$HOME/.ssh/id_rsa.pub” of master to “$HOME/.ssh/authorized_keys” all the slaves.
- 5. 5 5.4 Check by SSH to slaves ssh slave-01 ssh slave-02 5. Download Hadoop 5.1 Download Hadoop http://archive.cloudera.com/cdh/3/hadoop-0.20.2-cdh3u6.tar.gz 6. Install Hadoop 6.1 Untar Tar ball tar xzf hadoop-0.20.2-cdh3u6.tar.gz 6.2 Go to HADOOP_HOME_DIR cd hadoop-0.20.2-cdh3u6/ 7. Setup Configuration: 7.1 Edit configuration file conf/hadoop-env.sh and set JAVA_HOME export JAVA_HOME=path to be the root of your Java installation(eg: /usr/lib/jvm/jdk1.7.0_65) 7.2 Edit configuration file conf/core-site.xml and add following entries: <configuration> <property> <name>fs.default.name</name> <value>hdfs://master:9000</value> </property> <property> <name>hadoop.tmp.dir</name> <value>/home/hadoop_admin/hdata/hadoop-${user.name}</value> </property> </configuration> 7.3 Edit configuration file conf/hdfs-site.xml and add following entries: <configuration> <property> <name>dfs.replication</name> <value>2</value> </property>
- 6. 6 </configuration> 7.4 Edit configuration file conf/mapred-site.xml and add following entries: <configuration> <property> <name>mapred.job.tracker</name> <value>master:9001</value> </property> </configuration> 7.5 Edit configuration file conf/masters and add entry of secondary-master slave-01 IP/Alias of node, where secondary-master will run 7.6 Edit configuration file conf/slaves and add entry of slaves slave-01 slave-02 7.7 Set environment variables Update ~/.bashrc and set or update the HADOOP_HOME and PATH shell variables as follows: nano ~/.bashrc export HADOOP_HOME=/home/hadoop/hadoop-0.20.2-cdh3u6 export PATH=$PATH:$HADOOP_HOME/bin Hadoop is setup on master. 8. Setup Hadoop on slaves. 8.1 Repeat the step-3 and step-4 on all the slaves Step-3: “install Java” Step-4: “Add entry of master, slaves in hosts file” 8.2 Create tar ball of configured Hadoop-setup and copy to all the slaves: tar czf hadoop.tar.gz hadoop-0.20.2-cdh3u6 scp hadoop.tar.gz slave01:~ scp hadoop.tar.gz slave02:~ 8.3 Untar configured Hadoop-setup on all the slaves tar xzf hadoop.tar.gz Run this command on all the slaves 9. Start The Cluster 9.1 Format the name node: $bin/hadoop namenode –format This activity should be done once when you install hadoop, else It will delete all your data from HDFS
- 7. 7 9.2 Now start Hadoop services 9.2.1 Start HDFS services $bin/start-dfs.sh Run this command on master 9.2.2 Start Map-Reduce services $bin/start-mapred.sh Run this command on master 9.3. Check daemons status, by running jps command: 9.3.1 On master $jps NameNode JobTracker 9.3.2 On slaves-01: $jps TaskTracker DataNode SecondaryNameNode 9.3.3 On slaves-02: $jps TaskTracker DataNode 10. Stop the cluster 10.1 Stop mapreduce services $bin/start-mapred.sh Run this command on master 10.2 Stop HDFS services $bin/start-dfs.sh Run this command on master