干货 | 实践Hadoop MapReduce 任务的性能翻倍之路
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在MapReduce中，为了优化性能，我们可以使用Combine方法将具有相同键值的键值对进行合并。使用Combine能够减少Map阶段和Reduce阶段需要处理的数据量，并且也能够减少shuffle阶段传输的数据量，从而减少程序执行时间，提升系统性能。 MapReduce的流程如下：
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