Why use a bitwise AND here?

Asked 2011-02-05T01:09:34.597

I was reading through the hadoop code and found this line in a partitioner.

(key.hashCode() & Integer.MAX_VALUE) % numReduceTasks

Why are they using the bitwise AND?

java partitioning bitwise-operators

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1 Answer

To remove the sign bit. in the case that the hashCode is a negative number. its like Math.abs(key.hashCode())

answered 2011-02-05T01:11:57.963