cloudobjects: October 2013

Monday, October 28, 2013

How to write unit tests for your Hadoop MapRecude jobs

Simple answer: use MRUnit.

You will need a classifier to include it in your maven project:

  <dependency>
   <groupId>org.apache.mrunit</groupId>
   <artifactId>mrunit</artifactId>
   <version>1.0.0</version>
   <classifier>hadoop2</classifier>
   <scope>test</scope>
  </dependency>

Time based tests with joda time

In unit tests it is helpful to set a fixed date and time. With joda time you can do this by simply calling

DateTimeUtils.setCurrentMillisFixed(new DateTime(2013, 3, 2, 0, 0).getMillis());

Tuesday, October 8, 2013

How to launch eclipse with a specific jdk on mac os

Edit /Eclipse.app/Contents/MacOS/eclipse.ini. Add the following before -vmargs:

-vm 
/path/to/java/home

The linebreak after -vm matters! To find out the path to java home run

/usr/libexec/java_home
or 
/usr/libexec/java_home -v 1.7

Tuesday, October 1, 2013

How to install the sun 6 / oracle 7 jdk on ubuntu

https://github.com/flexiondotorg/oab-java6 provides a script for building a java package for sun jdk 6 and oracle jdk 7 for ubuntu.

wget https://github.com/flexiondotorg/oab-java6/raw/0.3.0/oab-java.sh -O oab-java.sh
chmod +x oab-java.sh
sudo ./oab-java.sh

sudo apt-get install sun-java6-jdk

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