Wrote a blogpost about it :) Maybe it can be copied to giraph's wiki?

http://ssc.io/running-giraphs-unit-tests-in-pseudo-distributed-mode/

--sebastian


On 17.12.2011 18:38, Avery Ching wrote:
> We should document this somewhere.  It is not intuitive as you mention.
> 
> Avery
> 
> On 12/17/11 1:41 AM, Sebastian Schelter wrote:
>> A small hint for everyone who wants to run giraph's unit tests on a
>> pseudo-distributed single node hadoop cluster:
>>
>> You have to adjust the configuration to allow 4 concurrent map tasks per
>> node (default in hadoop-0.20.203 is 2), otherwise the tests will fail!
>>
>> You have to adjust mapred.tasktracker.map.tasks.maximum and
>> mapred.map.tasks in mapred-site.xml. Took me a while to figure out :)
>>
>> --sebastian
> 

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