MRUnit单元测试Mapper和Reducer类在内存上独立运行, PipelineMapReduceDriver单线程运行.
LocalJobRunner单线程运行, 且仅有一个 Reducer能够启动
conf.set("mapred.job.tracker", "local");
conf.set("fs.default.name", "file:////");
FileSystem fs = FileSystem.getLocal(conf);MiniMRCluster, MiniYarnCluster, MiniDFSCluster 多线程
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