虽然一开始大多数配置的规模都经过精确的计算，但是随着时间的推移，集群的两端都在增长。
While most configurations are accurately sized in the beginning, over time both sides of the cluster grow.
他把项目的规模——生产出产品的规模和开发团队的规模——描述成一个必须介入任何过程配置的参数。
He describes project size — both the size of the product produced and the size of the development team — as one of the parameters that must factor into any process configuration.
为了进一步检验调优结果，需要在使用优化后的配置的情况下增加集群规模和输入数据规模，从而测试配置的可伸缩性。
To further verify the tuning result, you need to increase the cluster scale and input the data scale while using the optimized configuration you got to test the scalability of the configuration.
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