cocoon-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ralph Goers <Ralph.Go...@dslextreme.com>
Subject Re: hostname lookup
Date Tue, 05 Jun 2007 06:46:09 GMT
Well, I see a call to getRemoteHost in Cocoon.java but only when debug 
is enabled. Is debug enabled in your system?

I also see it used in a few other places such as the session framework, 
but there aren't that many. Frankly, if I was trying to troubleshoot 
this I'd just use a debugger and set breakpoints at each of the possible 
locations and see if anything sticks.

Leonid Geller wrote:
> IP->hostname is called reverse DNS lookup.
>  
> The slowdown consistently occurs when the client's hostname does not 
> have an "A" DNS record; having a "PTR" but no "A" record slows things 
> down even further.
>  
> Now, rather than worry about why some clients are set up this way, I 
> want to make sure the application does not care nor try to resolve the 
> IP back into a host. Something in Cocoon does that today, either an 
> InetAddress object or Request.getRemoteHost type call.
>  
> A similar issue was captured a while ago here:
> http://osdir.com/ml/text.xml.cocoon.user/2002-07/msg01283.html
>  
> But in our case, the servlet container (resin) does not make these 
> requests in a separate test web app. Only cocoon does.
>  
>  
>  
>  
>  
>
>     -----Original Message-----
>     *From:* Joerg Heinicke [mailto:joerg.heinicke@gmx.de]
>     *Sent:* Mon 6/4/2007 11:28 PM
>     *To:* users@cocoon.apache.org
>     *Cc:*
>     *Subject:* Re: hostname lookup
>
>     On 05.06.2007 02:41, Leonid Geller wrote:
>
>     > hostname of the http requestor/client. we have the lookup
>     disabled in
>     > apache (2.2.4), so requests handled by the web server or our j2ee
>     > container/default web app do not experience this problem. we can
>     tell
>     > that because 1) they result in access log entries that have client
>     > ip, not hostname, and 2) they are very fast :)
>     >
>     > a request to a cocoon web app results in the client's hostname
>     logged
>     > in access log, and if the client is behind a proxy/firewall that
>     > prevents IP->host resolution, this results in a 15-20 sec response
>     > delay. subsequent requests from the same client return
>     > instantaneously, as the dns entry is now cached.
>
>     I've never heard of such a "feature" and I'm not aware of a IP->host
>     resolution, only the other way around. Do you have a stacktrace
>     when it
>     fails?
>
>     Joerg
>
>     ---------------------------------------------------------------------
>     To unsubscribe, e-mail: users-unsubscribe@cocoon.apache.org
>     For additional commands, e-mail: users-help@cocoon.apache.org
>

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@cocoon.apache.org
For additional commands, e-mail: users-help@cocoon.apache.org


Mime
View raw message