> Mapper 2 starts reading at byte 10000. It finds the first newline at byte > 10020, so the first "real" record it processes starts at byte 10021. >
There's one problem: how does Mapper2 know the "real" record start at 10021 before Mapper1 reach the end of Split1 (9999)? Mappers starts at the same time. -- Zhong Wang
