This is a short memo to install Hadoop and sqoop (Hadoop interface with db backend) in Ubuntu Lucid.
First it is necessary to add the following debian repository from Cloudera, the host of Hadoop and sqoop.
This can be added from System -> Update manager -> Settings (bottom-left) -> Other sources (tab) -> add.
A Java environment is necessary, you should have at least default-jdk 1.6.
Then install the software itself:
sudo apt-get install hadoop
sudo apt-get install sqoop
sudo apt-get install hadoop-hbase
Once trying to launch sqoop on certain tables through PostgreSQL, you may find the following error:
sqoop import --table test --connect jdbc:postgresql://localhost/postgres --verbose
ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: Could not load db driver class: org.postgresql.Driver
This means that JDBC driver of PostgreSQL is not installed correctly.
You have to download it from here.
Then copy it in /usr/lib/sqoop/.
More details about the installation can be found here.