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MapReduce fail for more than 3 nodes

Question asked by filip on May 29, 2014
Latest reply on Jun 1, 2014 by evernight1
I have a really annoying problem. My Hadoop system works perfectly for 2 or 3 nodes (slaves). But when I rise a number of slaves on 4, or 5, Reduce job freezes on 16%.
Did anyone had a similar problem? Or does anyone maybe know where can be a solution of my problem, in nodes communication, or in Hadoop configuration?
Thanks in advance