hadoop cluster setup

　　ObjectiveWhen you build a Hadoop cluster, the first time you format it, take a snapshot . Do not casually lack of any process, just a format.　　problem description : start Hadoop times NameNode uninitialized: Java.io.IOException:NameNode is notformatted.At the same time, if you start the Namenode alone, it will appear, after startup for a while, the situation of

Resolution of SSH password-less login configuration error in Hadoop cluster setup some netizens said that firewall should be disabled before ssh is configured. I did it, but it should be okay to close it. Run the sudoufwdisable command to disable the firewall. then enter www.2cto. comssh-keygen on the terminal and parse the SSH password-less logon configuration e

In the home of two computers with VMware + RedHatLinuxAS6 + Hadoop-0.21.0 to build a 3 node Hadoop cluster, although it is already set up a similar cluster, I also ran Java API to operate HDFS and Map/reduce, but this time it was still challenged. Some small details and some omissions would be like a roller coaster. Th

Rhadoop is an open source project initiated by Revolution Analytics, which combines statistical language R with Hadoop. Currently, the project consists of three R packages, the RMR that support the use of R to write MapReduce applications , Rhdfs for the R language to access HDFs, and for R language Access The rhbase of HBase . Download URL for https://github.com/RevolutionAnalytics/RHadoop/wiki/Downloads. Note: The following record is the summary a

hadoop cluster boot sequenceZookeepeer->hadoop->hbase Hadoop cluster shutdown sequenceHbase->hadoop->zookeepeer Hadoop Primary and Standby node Status View and manual switchover$

(string.valueof (Res.getint (1)) + " \ t "+ res.getstring (2) +" \ T " + res.getstring (3)); } //Regular hive query sql = "SELECT COUNT (1) from "+ tableName; SYSTEM.OUT.PRINTLN ("Running:" + sql); res = stmt.executequery (SQL); while (Res.next ()) { SYSTEM.OUT.PRINTLN (res.getstring (1)); } } }//------------End--------------------------------------------- Iv. Display of results Running:show Tables ' testhivedrivertable ' Testhivedrivertable Running:describe testhivedrive

7 Yarn Installation ProcessInstall yarn on the basis of HDFS installation1) Modify the Mapred-site.xml file to configure MapReduce 2) Modify yarn-env.shModify Java_home value (export java_home=/usr/local/java/jdk1.7.0_79)3) Modify Yarn-site.xmlConfigure ResourceManager Configure NodeManager class4) Start yarn[Email protected]:/usr/local/hadoop# start-yarn.shMaster has the following processes:Slaves has the following processes:5) Run WordCount verif

Virtual machine-based Hadoop cluster installation1. The software we needXshell, SSH secure, virtual machine, Linux centos64, Hadoop1.2.1 installation package2. Install the above software3, install Linux, there is no more elaboration4. Install the JDK firstMy path isjava_home=/usr/lib/jvm/jdk1.7.0_79Path= PATH: Java_home/binClasspath= J AV AH OM E /LIb/d T.JaR: Java_home/lib/t

When installing the hadoop cluster today, all nodes are configured and the following commands are executed. Hadoop @ name-node :~ /Hadoop $ bin/hadoop FS-ls The Name node reports the following error: 11/04/02 17:16:12 Info Security. groups: group mapping impl = org. Apa

/id_rsa.pub ~/.ssh/authorized_keys4) master native uses SSH localhost test:The first time you will be prompted whether "is you sure want to continue connecting (yes/no)?", enter Yes directly, the next time you enter SSH localhost will not be prompted.5) Modify the hosts for each node (MASTER,NODE1,NODE2,NODE3):Statistics add the following host list:The purpose is to use the SSH connection for the rear, without entering the IP, using the machine name.6) In order to ensure that master can automati

We use 2 nodes to install the Hadoop cluster, where 192.168.129.35 is the primary node and the 192.168.129.34 is from the node. Create a user named Hadoop-user on both the Master node (192.168.129.35) and from the node (192.168.129.34) Master node (192.168.129.35) log in Hadoop-user Because the

I recently learned about hadoop and want to try the true distribution after running the standalone and pseudo distribution modes. So I found several idle PCs to prepare a small cluster. These machines are all Delloptiplex745755. 1. Install the basic system to find a machine to install Ubuntu11.04, choose the server kernel, then install the sun-java-6-jdk, establish h I recently learned about

Copy an objectThe content of the copied "input" folder is as follows:The content of the "conf" file under the hadoop installation directory is the same.Now, run the wordcount program in the pseudo-distributed mode we just built:After the operation is complete, let's check the output result:Some statistical results are as follows:At this time, we will go to the hadoop Web console and find that we have submit

After you can run the program in the Hadoop cluster environment on the command line, match the various configurations in Eclipse and click Run on Hadoop. The job runs successfully, and the results are visible on HDFs, but still, not committed to the real cluster environment. Long-time data, directly in the code to spec

The role of Setup run cleanup context in Hadoop execution1. Introduction1) Setup (), this method is only executed once by the MapReduce framework and performs a centralized initialization of the relevant variables or resources before performing the map task. If the resource initialization work is placed in the method map (), causing the mapper task to parse each

Setting up the Environment: jdk1.6,ssh Password-free communication System: CentOS 6.3 Cluster configuration: Namenode and ResourceManager on a single server, three data nodes Build User: YARN Hadoop2.2 Download Address: http://www.apache.org/dyn/closer.cgi/hadoop/common/ Step One: Upload Hadoop 2.2 and unzip to/export/yarn/ha