Currently the 2nd mapper doesn't work. One possible reason might be LongWritable cannot be cast to Text. Basically, it's that the 2nd mapper reads input from some intermediate files on disk (output ...

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// 3. 原先15-19行有5个if判断block size的大小，目前已经被移除，确认了一下__shfl_down_sync等warp shuffle指令可以handle一个block或一个warp的线程数量<32，不足32会自动填充0 ...