more on InetAddress resolution problem...

[Nick Johnson]

Another piece of interesting information, maybe...

This only happens after Tomcat has been running for a few hours, and it 
isn't that it is negative caching bad domains; rather, I have confirmed 
that InetAddress doesn't even make an initial attempt to resolve a name.  
It just starts refusing to resolve ANY name at all.

It happens regardless of whether Tomcat is running with its native 
libraries.

I ran a ktrace on the java process, and when it comes time to do the name 
resolution, it's repeatedly making NAMI requests for 
/etc/nsswitch.conf, /etc/services; reading /etc/services each time 
(apparently looking up the "domain" service, because it stops reading 
shortly after that), then it reads /etc/hosts.

Then it opens a socket, immediately closes it, twice, and then throws an 
exception.

Here's that part, starting immediately after /etc/hosts is read (from fd 
1413):

 31013 jsvc     CALL  read(0x585,0x82da000,0x1000)
 31013 jsvc     GIO   fd 1413 read 0 bytes
       ""
 31013 jsvc     RET   read 0
 31013 jsvc     CALL  close(0x585)
 31013 jsvc     RET   close 0
 31013 jsvc     CALL  kqueue
 31013 jsvc     RET   kqueue 1413/0x585
 31013 jsvc     CALL  socket(0x2,0x2,0)
 31013 jsvc     RET   socket 1414/0x586
 31013 jsvc     CALL  close(0x586)
 31013 jsvc     RET   close 0
 31013 jsvc     CALL  close(0x585)
 31013 jsvc     RET   close 0
 31013 jsvc     CALL  kqueue
 31013 jsvc     RET   kqueue 1413/0x585
 31013 jsvc     CALL  socket(0x2,0x2,0)
 31013 jsvc     RET   socket 1414/0x586
 31013 jsvc     CALL  close(0x586)
 31013 jsvc     RET   close 0
 31013 jsvc     CALL  close(0x585)
 31013 jsvc     RET   close 0
 31013 jsvc     CALL  socket(0x2,0x1,0)
 31013 jsvc     RET   socket 1413/0x585
 31013 jsvc     CALL  write(0x1,0xb175a80c,0x157e)
 31013 jsvc     GIO   fd 1 wrote 4096 bytes
(exception printed here)

One thing I notice is that these FD numbers seem -really- high, but there 
aren't any errors in response to these syscalls either.

   Nick

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