hadoop configuration example

problem. Execute the hadoop-examples-1.2.1.jar program, in fact, is to compile the java program into a jar file, and then run directly, you can get the results. In fact, this is also a method for running java programs in the future. Compile, package, and upload the program and run it. In addition, eclipse connects to Hadoop and can be tested online. The two methods have their own advantages and are not des

Hadoop-1.x installation and configuration 1. Install JDK and SSH before installing Hadoop. Hadoop is developed in Java. MapReduce and Hadoop compilation depend on JDK. Therefore, JDK1.6 or later must be installed first (JDK 1.6 is generally used in the actual production envi

Reprinted from: http://www.cnblogs.com/spark-china/p/3941878.html Prepare a second, third machine running Ubuntu system in VMware; Building the second to third machine running Ubuntu in VMware is exactly the same as building the first machine, again not repeating it.Different points from installing the first Ubuntu machine are:1th: We name the second to third Ubuntu machine for Slave1, Slave2, as shown in:There are three virtual machines in the created VMware:2nd: To simplify the

1 installationinstall hadoopInstall the 2.6.0, directory is/usr/local/cellar/hadoop, if you want to install another version, download the TAR package decompression. Address: http://mirrors.cnnic.cn/apache/hadoop/common/2 configurationConfigure the Hadoop executable path bin and sbin to environment variablesHADOOP_HOME=/usr/local/Cellar/

-------------Add a child element7. Assign the user read access to the directory----------------sudo chown-r uit:uit/home/uit/hadoop-0.20.2Permissions this really made my egg ache for a while. Always thought it was not well-equipped, the original authority did not fix, later found the right after the decompressionLimit what all have, is because did not add this sentence. Plus, it's all part of the current user.8. Change the environment variable--------

time you run Hadoop, you want to format the file system for Hadoop.In the Hadoop directory, enter:$ bin/hadoop Namenode-formatTo start the Hadoop service:$ bin/start-all.shIf there is no error, it means that the launch was successful.(3) Verify that Hadoop is installed succ

contentsHadoop Fs-tail/user/trunk/test.txt #查看 The last 1000 lines of the/user/trunk/test.txt fileHadoop fs-rm/user/trunk/test.txt #删除/user/trunk/test.txt fileHadoop fs-help ls #查看ls命令的帮助文档Two HDFS deployment　　　　　The main steps are as follows:1. Configure the installation environment for Hadoop;2. Configure the configuration file for Hadoop;3. Start the HDFs ser

Hadoop example code: 1. creatinga configuration object: to be able to read from or write to HDFS, you need tocreate a configuration object and pass configuration parameter to it usinghadoop configuration files. ImportOrg. Apache.

variable.Note: If the file you downloaded is in RPM format, you can install it by using the following command:RPM-IVH jdk-7u72-linux-x64.rpm4.5. environment variable settings Modify the. Profile file (this is recommended so that other programs can also use the JDK in a friendly way)# Vi/etc/profileLocate the export PATH USER LOGNAME MAIL HOSTNAME histsize INPUTRC in the file, and change to the following form:Export java_home=/opt/java/jdk1.7.0_72Export path= $PATH: $JAVA _home/bin: $JAVA _home/

Three hadoop modes:Local Mode: local simulation, without using a Distributed File SystemPseudo-distributed mode: five processes are started on one host.Fully Distributed mode: at least three nodes, JobTracker and NameNode are on the same host, secondaryNameNode is a host, DataNode and Tasktracker are a host.Test environment: CentOS2.6.32-358. el6.x86 _ 64 Jdk-7u21-linux-x64.rpm Hadoop-0.20.2-cdh3u6.tar.gz1.

Hadoop installation and configuration Manual I. Preparation Hadoop runtime environment: SSH service running properly JDK If you have not installed it, you can install it yourself. Ii. BASICS (single-node Hadoop) Hadoop download H