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mapreduce 跑不满资源这是为什么？

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mapreduce 跑不满资源这是为什么？

image.png
image.png

如图，我提交了一个MapReduce任务，这个任务的map数有很多，但是在队列资源没满的情况下，同时执行的map数缺很小，队列的配置也在截图中，请问如何提高map同时运行的个数。


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