hadoop cluster tutorial

file./hdfs/data--Storing data./hdfs/tmp--Storing temporary files　　　2.6 Modifying an XML configuration file　 The XML file that needs to be modified under hadoop2.9.1/etc/hadoop/There are 5 main files to modify:hadoop-env.shCore-site.xmlHdfs-site.xmlMapred-site.xmlYarn-site.xmlSlaves　　　　　2.6.1, vim hadoop-env.sh, fill in the Java installation path　　　　　　　　　　2.6.2, vim core-site.xml,configuration tag insert t

/jobtoken at Org.apache.hadoop.security.Credentials.readTokenStorageFile (Credentials.java:135) at Org.apache.hadoop.mapreduce.security.TokenCache.loadTokens (tokencache.java:165) at org.apache.h Adoop.mapred.TaskTracker.initializeJob (tasktracker.java:1179) at Org.apache.hadoop.mapred.TaskTracker.localizeJob (tasktracker.java:1116) at org.apache.hadoop.mapred.tasktracker$ 5.run (tasktracker.java:2404) at Java.lang.Thread.run (thread.java:744) caused by:java.io.FileNotFoundException:File File:/

Processesstart-all.shFinal Result:Custom Script Xsync (distributing files in the cluster)[/usr/local/bin]The file is recycled to the same directory as all nodes.[Usr/local/bin/xsync]#!/bin/bashpcount=$ #if ((pcountTestXsync Hello.txtCustom Script Xcall (executes the same command on all hosts)[Usr/local/bin]#!/bin/bashpcount=$ #if ((pcountTest Xcall RM–RF Hello.txtAfter the cluster is built, test run the fo

Ø change/etc/hosts, add all cluster machine IP to host name mappings Ø copy Hadoop package hadoop.tar.gz to/usr/local Ømd5sum Check hadoop.tar.gz package: md5sum hadoop.tar.gz Ø Decompression hadoop.tar.gz Package: Tar-xzf hadoop.tar.gz Ø Change hadoop-1.0.3 directory permissions: Chown-r hadoop:hadoop hadoop-1.0.3

Hadoop's balance tools are typically used to balance the file block distribution in each datanode in a Hadoop cluster while on-line Hadoop cluster operations. To avoid the problem of a high percentage of datanode disk usage (which is also likely to cause the node to have higher CPU utilization than other servers). 1) u

The production environment of Hadoop cluster installation and configuration + DNS + NFS environment LinuxISO: CentOS-6.0-i386-bin-DVD.iso32 bit JDKversion: 1.6.0 _ 25-eaforlinuxHad .. The production environment of Hadoop cluster installation and configuration + DNS + NFS environment LinuxISO: CentOS-6.0-i386-bin-DVD.is

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

(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

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

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

) View HDFs system[[emailprotected] ~] $ hadoop fs -ls /View the Hadoop HDFs file management system through Hadoop fs-ls/commands, as shown in the Linux file system directory. The results shown above indicate that the Hadoop standalone installation was successful. So far, we have not made any changes to the

To run a JNI program on a Hadoop cluster, the first thing to do is to debug the program on a stand-alone computer until the JNI program is properly run, and then porting to the Hadoop cluster is a good deal. The way Hadoop runs the program is through the jar package, so we

Description :Hadoop Cluster management tools Datablockscanner Practical Detailed learning notesDatablockscanner a block scanner running on Datanode to periodically detect current Datanode all of the nodes on the Block to detect and fix problematic blocks in a timely manner before the client reads the problematic block. It has a list of all the blocks that are maintained, by scanning the list of blocks seq

installer will provide you with a separate dialog box for each disk, and it cannot read a valid partition table. Click the Ignore All button, or the Reinitialize All button, to apply the same answer to all devices.2.8 Setting host name and networkThe installer prompts you to provide and the domain name for this computer's hostname format, setting the hostname and domain name. Many networks have DHCP (Dynamic Host Configuration Protocol) services that automatically provide a connection to the do