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If they were not all the same size, results fron the smaller ones could be written out while the larger ones were being processed.  Ideally, just as the smallest piece finished writing out its results, the second-smallest would start, then the third start as the second finished, etc.  This requires that the sizes of the peices follow a geometric progression, which results in a lot of small pieces.  For chunks, that should be fine, but making more crumbs out of a chunk is kind of a bad thing because all of the recon jobs have to read the whole chunk.