Hadoop

Apache Hadoop documentation

• Single node setup
• Cluster setup

Setup terminal rooms

An Ubuntu package for hadoop (downloaded from ftp.nluug.nl) has been added to the science ubuntu repository.

hadoop_1.1.1-1_x86_64.deb

Local users

uid: 201 for hdfs
uid: 202 for mapred
gid:  49 for hadoop

In /etc/hadoop/hadoop-env.sh, the HADOOP_CLIENT_OPTS environment variable has been changed from -Xmx128m to -Xmx1024m.

Stand-alone test

With this setup, we could successfully run the example job:

$ cd /scratch/
$ mkdir input 
$ cp /usr/share/hadoop/templates/conf/*.xml input 
$ hadoop jar /usr/share/hadoop/hadoop-examples-1.1.1.jar grep input output 'dfs[a-z.]+' 
$ cat output/*