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Comment on Shuffle Sharding: massive and magical fault isolationparent

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Isn't the number used later in the article incorrect too?

The article says: "Thus the real impact is constrained to 1/56th of the overall shuffle shards." Shouldn't it be 1/28th? It's 8*7 / 2 since the permutations "shards x, y" and "shards y, x" are the same as far as fault-tolerance is concerned.

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