Java杂谈



Java杂谈

CLOSE_WAIT表示对方发送一个FIN后,程序这边没有进一步发送ACK以确认。换句话说就是在对方关闭连接后,程序里没有检测到,或者程序里本身就已经忘了这个时候需要关闭连接,于是这个资源就一直被程序占用着。所以处于CLOSE_WAIT本身就表示程序中有bug,需要从程序角度去解决问题。一般情况下,导致CLOSE_WAIT主要有两种可能:

  • 程序Bug,接收到FIN信号后没有及时关闭socket。比如:程序异常,导致close()方法没有执行。

  • 关闭socket不及时;比如:I/O线程太少,导致I/O操作处理不及时,链路不能被及时释放。


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