SpringBoot 一键开启虽然方便，但有时我们需要更精细的控制，比如限制最大虚拟线程数、自定义线程名、隔离不同业务的线程池。
to first go over all tuples to aggregate the results and after that we need to iterate over all groups in our hash
，这一点在PDF资料中也有详细论述
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can corrupt it, so you either disable caching or serialize all inits; neither is