Handlers module
For a few months, Finder has been having trouble with some Spotlight queries sometimes. When it happens, Eeither they seemingly kick off and just hang forever, or they show results and then as you try to do something, Finder hangs (maybe as a result of a race condition during an update of the result). The only cure is to relaunch the Finder. Rebuilding the entire Spotlight index does nothing to alleviate this.。关于这个话题，同城约会提供了深入分析
，这一点在服务器推荐中也有详细论述
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我之前搞一个物流轨迹查询接口的时候就栽过。这个接口要查订单库、调用三方物流接口、还要查缓存，单次请求平均耗时400ms。用传统线程池，核心线程设了200，最大线程400，队列也放了，压测QPS顶多320，再往上加并发，响应时间直接崩到3秒开外，线上时不时就报“接口超时”，每次上线都提心吊胆。，这一点在体育直播中也有详细论述