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Why does MapReduce run slowly?

2022-02-04 16:25:37 Alibaba cloud Q & A

Why? MapReduce Running slowly ?

Take the answer 1:

1. Poor computer performance

2. Data skew

3.Map and Reduce The number setting is unreasonable

4. Too many small files

5. A large number of inseparable kua Large file of blocks

6.spill Too many times

7.Merge Too many times

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