☆HashMap多线程并发问题分析 - 陶邦仁的个人空间 - 开源中国



☆HashMap多线程并发问题分析 - 陶邦仁的个人空间 - 开源中国

##并发问题的症状## ###多线程put后可能导致get死循环### 从前我们的Java代码因为一些原因使用了HashMap这个东西，但是当时的程序是单线程的，一切都没有问题。后来，我们的程序性能有问题，所以需要变成多线程的，于是，变成多线程后到了线上，发现程序经常占了100%的CPU，查看堆栈，你会发现程序都Hang在了HashMap.get()这个方法上了，重启程序后问题消失。但是过段时间又会来。而且，这个问题在测试环境里可能很难重现。


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