Wrote a blogpost about it :) Maybe it can be copied to giraph's wiki?
On 17.12.2011 18:38, Avery Ching wrote:
> We should document this somewhere. It is not intuitive as you mention.
> 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 :)