hadoop commands tutorial

To make it easier for you to review your memory, we will summarize the hadoop commands of today's experiment for later viewing.Note: The following commands are performed in hadoop/bin.1. hadoop FS-ls \-> View All the following directories.2.

commands in the Hadoop process:1. View the process Linux under View process: $ PS Linux View Java process: $ jps 2. View Hadoop-related commands $ hadoop (using such as: $ Hadoop namenode–format) 3. Vi

Basic Hadoop tutorial This document uses the Basic Environment configuration of the K-Master server as an example to demonstrate user configuration, sudo permission configuration, network configuration, firewall shutdown, and JDK installation. Follow these steps to complete KVMSlave1 ~ The Basic Environment configuration of the KVMSlave3 server.Development Environment Hardware environment: Four CentOS 6.5

Hadoop instance video tutorial-in-depth development of hadoopWhat is hadoop, why learning hadoop?Hadoop is a distributed system infrastructure developed by the Apache Foundation. You can develop distributed programs without understanding the details of the distributed underl

1. Test the speed of Hadoop writesWrite data to the HDFs file system, 10 files, 10MB per file, files stored in/benchmarks/testdfsio/io_dataHadoop jar Share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.0-tests.jar Testdfsio-write-nrfiles 10- FileSize 10MB2. Test the speed of Hadoop read filesRead 10 files in t

A. Common Hadoop commands1. The FS command for Hadoop#查看hadoop所有的fs命令Hadoop FS#上传文件 (both put and copyfromlocal are upload commands)Hadoop fs-put jdk-7u55-linux-i586.tar.gz hdfs://hucc01:9000/jdkhadoop fs-copyfromlocal jdk-7u55-li

Preface: Well, it's just a little bit more comfortable without writing code, but we can't slack off. The hive operation's file needs to be loaded from hereSimilar to the Linux commands, the command line begins with the Hadoop FS -(dash) LS / list file or directory cat Hadoop FS -cat ./hello.txt/opt/old/ Htt/hello.txt View files can dump directories or

/ci_cuser_20141231141853691/* ' >ci_cusere_20141231141853691.csv echo $?~/.bash_profile: Each user can use this file to enter shell information dedicated to their own use, when the user logs on, theThe file is only executed once! By default, he sets some environment variables to execute the user's. bashrc file.Hadoop fs-cat ' $1$2/* ' >$3.csvMV $3.csv/home/ocdc/cocString command = "CD" + Ciftpinfo.getftppath () + "" +hadooppath+ "Hadoop fs-cat '/user

A EnvironmentSystem: Ubuntu 14.04 32bitHadoop version: Hadoop 2.4.1 (Stable)JDK Version: 1.7Number of clusters: 3 unitsNote: The Hadoop2.4.1 we download from the Apache official website is a linux32-bit system executable, so if you need to deploy on a 64-bit system, you will need to download the SRC source code to compile it yourself.Two. Preparatory work(All three machines need to be configured in the first four steps)1. Install ubuntu14.04 32bits2.

success:mysql-h172.16.77.15-uroot-p123 mysql-h host address-u user name-P user PasswordView Character SetsShow variables like '%char% ';To Modify a character set:VI/ETC/MY.CNF add Default-character-set=utf8 under [client]create sudo without password loginTo set the Aboutyun user with no password sudo permissions: Chmode u+w/etc/sudoersaboutyun all= (root) nopasswd:allchmod u-w/etc/sudoers test: sudo ifconfigUbuntu View Service List codesudo service--status-allsudo initctl listTo view the file s

. Hiveimport:hive import complete. Iii. Sqoop Order Sqoop has about 13 commands, and several common parameters (all of which support these 13 commands), and here are the 13 commands listed first.It then lists the various common parameters for Sqoop, and then lists their own parameters for the above 13 commands. S