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不改一行代码定位线上性能问题
source link: https://juejin.im/post/5be8c779f265da616f6f7db4
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背景 最近时运不佳，几乎天天被线上问题骚扰。前几天刚解决了一个 HashSet 的并发问题，周六又来了一个性能问题。 大致的现象是： 我们提供出去的一个 OpenAPI 反应时快时慢，快的时候几十毫秒，慢的时候几秒钟才响应。 尝试解决 由于这种也不是业务问
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