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The following page has been changed by AshutoshChauhan: http://wiki.apache.org/pig/PigMergeJoin ------------------------------------------------------------------------------ getNext() in POMergeJoin should be updated so that it doesn't make this assumption. - + ''' Performance ''' : Currently POMergeJoin buffers all the tuples belonging to same key on left side before looking at right key. If keys don't match it throws away that buffer and moves on. Better way is to first look at both keys and then determine if there is any need of doing buffering. This will not save on CPU time because amount of work is nearly equal in either case, though it may affect memory footprint because in case of skewed key which don't match we will unnecessarily be consuming memory.
