Date: Mon, 29 Oct 2007 18:31:15 -0700 (PDT) From: Nick Johnson <freebsd@spatula.net> To: freebsd-java@freebsd.org Subject: Simple, reliable test case for name resolution problem Message-ID: <20071029163446.L25435@turing> In-Reply-To: <20071029152022.H25435@turing> References: <20071023195511.GA27666@misty.eyesbeyond.com> <20071023170536.H25435@turing> <20071024210348.GA34044@misty.eyesbeyond.com> <20071026205754.15950c80@tinca> <20071026121159.A25435@turing> <20071026134734.M25435@turing> <20071026162351.B25435@turing> <20071028130627.A25435@turing> <20071028141053.G25435@turing> <20071029152022.H25435@turing>
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The problem is in the number of open file descriptors. Once it crosses
1024, name resolution breaks. This is showing up in Tomcat 6, because
Tomcat 6 is leaking descriptors like a sieve.
Here's a simple test case that demonstrates the problem. On my FreeBSD
6.2 host it bombs every time. On a Linux host, it throws an IOException
opening files (too many open files). On a Windows box it completes
normally.
My uname and java -version, just for completeness:
FreeBSD turing.morons.org 6.2-STABLE FreeBSD 6.2-STABLE #0: Sun Jan 21 16:53:54 PST 2007
java version "1.5.0_13-p7"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_13-p7-root_26_oct_2007_14_03)
The same thing happens with the Diablo JDK.
Here's the code. Save it as Test.java; javac Test.java; java Test
import java.net.*;
import java.util.*;
import java.io.*;
public class Test {
public static void main(String[] args) throws Exception {
ArrayList files = new ArrayList(1024);
System.out.println("Opening lots of files");
for(int i=0; i < 1024; i++) {
files.add(new FileInputStream("/dev/null"));
}
System.out.println("Trying to resolve freebsd.org");
InetAddress.getByName("freebsd.org"); // throws exception!
}
}
--
"Courage isn't just a matter of not being frightened, you know. It's being
afraid and doing what you have to do anyway."
Doctor Who - Planet of the Daleks
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