Install pseudo-distributed Hadoop under Ubuntu

Installation Preparation:(1) Hadoop installation package: hadoop-1.2.1.tar.gz(2) JDK installation package: jdk-7u60-linux-i586.gz(3) The Eclipse installation package and the Eclipse and Hadoop-related jar packages are required if eclipse development is required.
Installation:(1) can choose a new user installation can also use the current account. (2) Specify the user group to be owned:
(3) to give users Hadoop privileges:sudo vim/etc/sudoers changes added:

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Update (required): Source/etc/profile Test:
the JDK is complete. (6) SSH free password:General Ssh-client included in Ubuntu system, but Ssh-server is not installed, can be tested by SSH IP; installing Ssh-server:sudo apt-get install SSH after installation, do the following:

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Generated:





SSH can log in.

(7) Installing Hadoopthe ability to create a Hadoop to a directory first: sudo mkdir/usr/hadoop cd/usr/hadoop/sudo tar-zxvf hadoop-1.2.1.tar.gz sudo mv hadoop-1.2.1 Hadoop sudo chown-r hadoop:hadoop Hadoop gives Hadoop users access to directory Hadoop read sudo rm-rf hadoop-1.2.1.tar.gz configuration is required after installation:Configure/etc/profile join: sudo vim/etc/profile
to configure the hadoop-env.sh file: sudo vim/usr/hadoop/conf/hadoop-env.sh:

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Create a directory: Used to configure Hadoop.tmp.dir parameters:sudo mkdir/usr/hadoop/tmp
to configure the core file: Core-site.xml:

Hdfs-site.xml:

Mapred-site.xml:

start: Because the previous configuration input:To Format a node: Hadoop namenode-formatStart: start-all.sh JPS View

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stop: stop-all.sh
(8) Installing Eclipsefirst create a directory unzip the installation ....
Getting in and starting eclipse has a small problem:Eclipse cannot find the JDK or JRESolution:cd/home/hadoop/eclipse (install eclipse) sudo ln-sf $JRE _home JRE That 's it:
for Eclipse configuration Hadoop copies the associated plug-in to eclipse into the plugins directory:

start eclipse:window->perferences:

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The installation folder for Hadoop.

Settings: Right-click the following blank area:
Appears: and configures

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Point to the left side of the small elephant:

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Eclipse configuration is complete.

Later you can write your job in Eclipse and then run it to the terminal.
configuration encountered problems: Namenode Datanode not up: The solutions are for example the following: (1) Delete/usr/hadoop/tmp (2) in creation: sudo mkdir/usr/hadoop/tmp (3) Delete all files starting with Hadoop in the/tmp directory: sudo rm-rf/tmp/hadoop* (4) Formatting again: Hadoop namenode-format (5) Start start-all.sh

Install pseudo-distributed Hadoop under Ubuntu