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From Pid <>
Subject Re: Very slow HttpServletRequest.getLocalName()
Date Wed, 07 Jul 2010 15:21:22 GMT
On 07/07/2010 15:08, mmg wrote:
> Hello,
> I've recently deployed an application on our Linux staging server; a Tomcat
> 5.5.28 server on Java 1.5.0_09-b01. At some point, the application makes a
> call to request.getLocalName(). For some reason, this call takes a very long
> time (about 20 seconds!). I profiled the application, and I see that tomcat
> calls InetAddress.getHostName() in turn. This performs a reverse DNS lookup.
> It's this reverse DNS lookup that takes so long (since our host doesn't have
> a DNS address the resolve fails).
> Is there a way to disable this reverse DNS lookup in Tomcat or is there
> anything else I can do to speed this up?

It's nothing to do with Tomcat.

There are JVM settings which apply to networking & DNS lookups.  You
might be affected by these, depending on your system configuration.


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