KPI 历史记录请求是异步的；可以在验证数据并完成错误处理后发出事件。

The KPI history requests are asynchronous; an event can be dispatched after you have verified the data and finished the error handling.

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通过MapReduce的抽象，google工程师可以简单地进行运算，而不必考虑并行运算的细节、数据的分配、负载平衡和错误处理。

MapReduce is an abstraction that allows Google engineers to perform simple computations while hiding the details of parallelization, data distribution, load balancing and fault tolerance.

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编程基础（变量，数据类型，引用，指针，作用域，错误处理，迭代，核心算法-搜索，排序等）

The basics of Programming (variables, data types, references, pointers, scope, error handling, iteration, core algorithms - searching, sorting, etc.)

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