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The computation in the above mentioned class-method is below:
long estimate = Math.round(((double)inputSize * completedMapsOutputSize * 2.0)/completedMapsInputSize);
Given http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html#round(double), its possible that the returned estimate could be Long.MAX_VALUE if completedMapsInputSize is determined to be zero.
This can be proven with a simple code snippet:
class Foo { public static void main(String... args) { long inputSize = 600L + 2; long estimate = Math.round(((double)inputSize * 1L * 2.0)/0L); System.out.println(estimate); } }
The above conveniently prints out: 9223372036854775807, which is Long.MAX_VALUE (or 8 Exbibytes per MapReduce).
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Thanks Karthik. Thanks Harsh for reviewing it. Committed to branch-1.