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Setting up Giraph can be a bit tricky and time consuming, unless you follow word by word a (subjectively) good guide, like the one I am giving here :p (and still there is a high probability that something else will go wrong).
Giraph has a few prerequisites that need to be satisfied before running successfully. These are:
After completing these steps, you can happily proceed with setting up Giraph!
Below, I am trying to give a clear guide to install all of them. The guide is based on the steps I followed to install them in machines with Ubuntu 64-bit 12.04 and Ubuntu 64-bit 12.10.
So, here it goes!