Difference between revisions of "Hadoop"
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| Line 20: | Line 20: | ||
$ mkdir input | $ mkdir input | ||
$ cp /usr/share/hadoop/templates/conf/*.xml input | $ cp /usr/share/hadoop/templates/conf/*.xml input | ||
| − | $ hadoop jar /usr/share/hadoop/hadoop-examples- | + | $ hadoop jar /usr/share/hadoop/hadoop-examples-*.jar grep input output 'dfs[a-z.]+' |
$ cat output/* | $ cat output/* | ||
Revision as of 16:30, 28 March 2013
Apache Hadoop links
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-*.jar grep input output 'dfs[a-z.]+' $ cat output/*