经常链接超时，最后没有足够缓存空间卡死了服务，求解

Question

频繁出现connect timed out，有时出现 Address already in use，最后抛出

No buffer space available (maximum connections reached?): connect

是什么问题呢？求解。具体错误信息如下。。

java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at sun.net.NetworkClient.doConnect(NetworkClient.java:158)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:975)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:916)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:841)
at org.wltea.web.util.SimpleHttpClient.post(SimpleHttpClient.java:75)
at org.wltea.luci.client.RemoteIndexService.postQueryCommand(RemoteIndexService.java:367)
at org.wltea.luci.client.RemoteIndexService.query(RemoteIndexService.java:207)
at com.youboy.search.LuciSearchFk.soxggq(LuciSearchFk.java:506)
at s._gy_jsp._jspService(_gy__jsp.java:480)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:506)
at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:253)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:170)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:662)

java.net.BindException: Address already in use: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at sun.net.NetworkClient.doConnect(NetworkClient.java:158)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:975)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:916)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:841)
at org.wltea.web.util.SimpleHttpClient.post(SimpleHttpClient.java:75)
at org.wltea.luci.client.RemoteIndexService.postQueryCommand(RemoteIndexService.java:367)
at org.wltea.luci.client.RemoteIndexService.query(RemoteIndexService.java:223)
at com.youboy.search.LuciSearchFk.soxgc(LuciSearchFk.java:393)
at s._gy_jsp._jspService(_gy__jsp.java:305)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:506)
at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:253)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:170)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:662)

Answer 1

会不会是你的 ServerSocket 设置了连接最大数，而客户端在连接的时候又规定了连接的最长等待时间？如果这样的话，当服务器的连接数已达最大，而又有客户端想连接的话，在等待指定时间后，应该会报 time out。
至于 Address already in use ，估计是你直接杀掉了进程但端口未被释放，从而你再次想使用这个端口的时候就报这个错