hadoop setup tutorial

[hadoop@hadoop01. ssh]$ Cat id_dsa.pub.hadoop03 >> Authorized_keysDistribute the Authorized_keys on the master host to each slave host:[email protected]. ssh]$ SCP Authorized_keys [email protected]:/home/hadoop/.ssh/authorized_keys[hadoop@ Hadoop01. ssh]$ SCP Authorized_keys [email protected]:/home/hadoop/.ssh/Authori

bloggers)Environment configurationModified hostname Vim/etc/hostname modified with hostname test modified successfullyAdd hosts vim/etc/hosts 192.168.3.150 donny-lenovo-b40-80 192.168.3.167 cqb-lenovo-b40-80SSH configurationSSH-KEYGEN-T RSASsh-copy-id-i ~/.ssh/id_rsa.pub [email protected]Hadoop configurationVim/etc/hadoop/core-site.xmlVim/etc/hadoop/hdfs-site.xm

Hadoop learning notes (1) Environment setup My environment is: Install hadoop1.0.0 in ubuntu11.10 (standalone pseudo-distributed) Install SSH Apt-Get Install SSHInstall rsyncApt-Get install rsyncConfigure SSH password-free LoginSsh-keygen-t dsa-p'-f ~ /. Ssh/id_dsaCat ~ /. Ssh/id_dsa.pub> ~ /. Ssh/authorized_keysVerify whether it is successfulSSH localhostInstall hadoop1.0.0 and JDKCreate a Linux terminal

I. Create Hadoop user portfolio under Ubuntu Hadoop user1. Create a Hadoop user group addgroup HADOOP2, create a Hadoop user adduser-ingroup Hadoop hadoop3, Add permissions for Hadoop users vim/etc/sudoers 4, switch to

/08/01 10:50:17 INFO mapred.JobClient: Job complete: job_201408010921_000814/08/01 10:50:17 INFO mapred.JobClient: Counters: 29......7) View the results of the output[[emailprotected] CompanyJoinAddress]$ hadoop fs -ls CompanyJoinAddress/outputFound 3 items-rw-r--r-- 1 hadoop supergroup 0 2014-08-01 10:50 /user/hadoop/CompanyJoinAddress/output/_SUCCESSdrwxr-xr-

/08/01 10:50:17 INFO mapred.JobClient: Job complete: job_201408010921_000814/08/01 10:50:17 INFO mapred.JobClient: Counters: 29......7) View the results of the output[[emailprotected] CompanyJoinAddress]$ hadoop fs -ls CompanyJoinAddress/outputFound 3 items-rw-r--r-- 1 hadoop supergroup 0 2014-08-01 10:50 /user/hadoop/CompanyJoinAddress/output/_SUCCESSdrwxr-xr-

Setup function source code: (Excerpt from "Hadoop Combat")*called once at the start of the task.protected void Setup (context context) throws ioexception,interruptedexception{}As you can tell from the comments, the setup function is called when the task starts.Jobs in MapReduce are organized into Maptask and Reducetask

The main process for installing and setting up Hadoop under Ubuntu.1. Create a Hadoop userCreate a user named Hadoop and create the user's home directory under home without detailed description.2. Installing the Java EnvironmentDownload the jdk:jdk-8u111-linux-x64.tar.gz under Linux environment.Create a Java folder under USR, copy the jdk-8u111-linux-x64.tar.gz t

comment #) Note: Some blogs write that you need to comment out the next line export hadoop_opts= "-djava.security.krb5.realm=ox. ac.uk-djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk "(remove comments) I didn't find this one, so I didn't have this one. 2. Configuration core-site.xml--Specifies the hostname and port of the Namenode 4. Configuration mapred-site.xml--Specifies the hostname and port of the Jobtracker 5.SSH configuration turn on sharing in

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