File pool (like Connection Pool)

My English is like 3years old baby.

Recently, I made a website with Many File Access.

Unfortunately, My tomcat gave me this following error message

Fatal: Socket accept failed
java.net.SocketException: Too many open files
        at java.net.PlainSocketImpl.socketAccept(Native Method)
        at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:408)
        at java.net.ServerSocket.implAccept(ServerSocket.java:462)
        at java.net.ServerSocket.accept(ServerSocket.java:430)
        at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61)
        at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:352)
        at java.lang.Thread.run(Thread.java:662)
org.apache.tomcat.util.net.JIoEndpoint$Acceptor run

This happens when I send request in short time, I guess there too many stream opened for this job.

Does anybody know how to solve this problem.

My Environment are { tomcat 6.0.35, java 1.6.0_31, centos 5 } Ah, This only happens on Linux;

thank you.

Solution

Check the limit allocated by the system cat /proc/sys/fs/file-nr

(last number)

Allocate more if needed

Edit /etc/sysctl.conf

Add/change fs.file-max = xxxxx

Apply changes sysctl -p

Check cat /proc/sys/fs/file-max

You may also have user limits set.