CS►network►网络编程-socket编程

java.net.SocketException: No buffer space available

  • It certainly sounds like you are leaking Sockets somehow in your app. 这句话意思就是开了socket，没有关

  • Check that your code always closes the Sockets it opens … even in the event of some exception; i.e. do the close in a finally block.

state 介绍

  • TIME_WAIT：表示主动关闭，通过优化系统内核参数可容易解决。
  • CLOSE_WAIT：表示被动关闭，需要从程序本身出发。
  • ESTABLISHED：表示正在通信

解决办法

下次出现这种情况的时候，
netstat -apn | grep java
netstat -apn | grep 8983
netstat -nap | grep pid
检查一下本机java程序占用了多少端口，主要是跟8983的连接还是5000的连接？

端口占用状态

某次的结果

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tcp        0      0 127.0.0.1:63342         0.0.0.0:*               LISTEN      8959/java
tcp        0      0 127.0.0.1:6942          0.0.0.0:*               LISTEN      8959/java
tcp        0      0 0.0.0.0:54152           0.0.0.0:*               LISTEN      8959/java
tcp6       0      0 127.0.0.1:7983          :::*                    LISTEN      23705/java
tcp6       0      0 :::8080                 :::*                    LISTEN      32668/java    listen状态，是本地tomcat启动的项目，监听8080
tcp6       0      0 :::8983                 :::*                    LISTEN      23705/java     listen状态，是本地jetty启动的solr，监听8983端口
tcp6       0      0 :::53056                :::*                    LISTEN      9342/java
tcp6       0      0 127.0.0.1:8005          :::*                    LISTEN      32668/java
tcp6       0      0 :::8009                 :::*                    LISTEN      32668/java
tcp6       1      0 127.0.0.1:36061             127.0.0.1:8983             CLOSE_WAIT     32668/java  tomcat启动的项目，向solr发送socket连接
tcp6       1      0 127.0.0.1:36060             127.0.0.1:8983             CLOSE_WAIT     32668/java
tcp6       1      0 127.0.0.1:36062             127.0.0.1:8983             CLOSE_WAIT     32668/java
tcp6       0      0 9.186.100.11:57211      151.101.40.215:80       ESTABLISHED  9342/java
tcp6       0      0 9.186.100.11:46481      151.101.44.215:80       ESTABLISHED  9342/java
tcp6       0      0 9.186.100.11:46483      151.101.44.215:80       ESTABLISHED  9342/java

tcp6       0      0 9.186.100.11:46482      151.101.44.215:80       ESTABLISHED   9342/java

tcp6       0      0 9.186.100.11:46484      151.101.44.215:80       ESTABLISHED   9342/java

某次的结果

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tcp6       0      0 :::8080                 :::*                    LISTEN      75106/java
tcp6       0      0 :::8983                 :::*                    LISTEN      74867/java

 tomcat启动的项目，向solr发送socket连接，怎么变这么多了？
会存在多个线程采用同一个单例，向solr发送socket连接
tcp6       1      0 127.0.0.1:48876         127.0.0.1:8983          CLOSE_WAIT  75106/java   close的socket连接
tcp6       1      0 127.0.0.1:45752         127.0.0.1:8983          CLOSE_WAIT  75106/java   close的socket连接
tcp6       1      0 127.0.0.1:48925         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48729         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48714         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48924         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48763         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48764         127.0.0.1:8983          CLOSE_WAIT  75106/java

过一段时间会有变化，下面标红色的，是新增的两个socket连接，

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tcp6       1      0 127.0.0.1:48925         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48729         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:56303         127.0.0.1:8983          CLOSE_WAIT  75106/java    新增的socket连接
tcp6       1      0 127.0.0.1:48714         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48924         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:48763         127.0.0.1:8983          CLOSE_WAIT  75106/java
tcp6       1      0 127.0.0.1:56302         127.0.0.1:8983          CLOSE_WAIT  75106/java   新增的socket连接
tcp6       1      0 127.0.0.1:48764         127.0.0.1:8983          CLOSE_WAIT  75106/java

solrSearch.query(queryParameters); 会建立连接 默认采用GET方式发送请求
还是 new HttpSolrClient(URL) 的尚未建立连接，只是做了一下config。

update的时候
solr.add(doc) send the SolrInputDocument to the Solr update request handler over HTTP.