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我了解输入拆分大小和块大小的含义。但我想了解的是 MR 程序在哪里以及如何提到输入拆分大小......它是在使用(Hadoop jar MRPROGRAM ...等)启动MR作业时传递参数还是在MR Job 配置程序还是在其他地方提到过。请解释。