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To: tomcat-dev@jakarta.apache.org
From: Costin Manolache <cmanolache@yahoo.com>
Subject: Re: inprocess Tomcat/apache via mod_jk
Date: Sun, 21 Aug 2005 06:41:49 -0700
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With worker - it may work. However you may find mod_jk inprocess to be 
slower than ajp and mod_proxy ( or comparable in speed ), this is due to 
  the way parameters are passed as strings ( i.e. lots of unoptimized 
char-byte conversion ).

Porting to 5.5.x shouldn't be hard - the interface between tomcat and 
modjk is very simple: you need to startup, i.e. make sure classpath is 
set and the class that executes launches tomcat correctly, and then it's 
a simple class that does the request/response passing.

If you do this for performance reasons - you may want to look at the 
code in jk2, and try to backport it. A benefit would be that the 
interface is even simpler - the req/response are passed in the same kind 
of buffer as ajp requests. AFAIK that's the only major difference. Since 
Remy, Mladen, etc have greatly optimized the regular tcp connectors - 
probably the difference on performance ( with this optimization 
backported ) will be small. But if you use the old style of interface - 
I'm sure jni will be slower (it was slower 2 years ago).

Costin


Christine Ho wrote:
> Hi,
>    Thanks a lot. I am really appreciated for your
> reply. How about the worker MPM? My team is running
> the httpd.worker on RHEL4. The current setting is:
> 
> StartServers 1
> ServerLimit 1
> 
> MaxClients 64
> MinSpareThreads 32
> MaxSpareThreads 64
> ThreadsPerChild 64 
> 
> Does the inprocess Tomcat 5.5.9 work for the worker
> MPM?
> 
> thanks,
> Christine
> 
> --- Bill Barker <wbarker@wilshire.com> wrote:
> 
> 
>>Well, inprocess doesn't really work for any MPM on
>>*nix systems (e.g. with
>>the prefork MPM, you end up with MaxChild copies of
>>Tomcat running :).  As a
>>result, there just hasn't been that much interest in
>>implementing (or even
>>back-porting) a feature that only works on Windows
>>and NetWare.
>>
>>
>>----- Original Message -----
>>From: "Christine Ho" <opensrc888@yahoo.com>
>>To: <tomcat-dev@jakarta.apache.org>
>>Sent: Tuesday, August 16, 2005 3:30 PM
>>Subject: inprocess Tomcat/apache via mod_jk
>>
>>
>>Hi,
>>   I have posted this email a month ago. I just
>>wonder
>>if any developer on mod_jk can answer my question. I
>>would like to have inprocess Tomcat 5.5.9 running in
>>Apache 2.x if possible.
>>
>>thanks again,
>>Christine
>>
>>
>>Hi,
>>   I tried to setup Tomcat 5.5.9 running inside the
>>apache server 2.x via the mod_jk on RHEL4. I got the
>>following error:
>>[debug] open_jvm2::jk_jni_worker.c (1055): JVM
>>created
>>[emerg] get_bridge_object::jk_jni_worker.c (1097):
>>Can't find class
>>org/apache/tomcat/modules/server/JNIEndpoint
>>
>>I looked at the mod_jk source codes and found out
>>that
>>the mod_jk supports the TC32_BRIDGE_TYPE and
>>TC33_BRIDGE_TYPE. It doesnt support bridge type of
>>tomcat 4.x and up. Plus the tomcat 5.5.9 doesnt have
>>the JNIEndpoint.class.
>>
>>However, it seems to me that the deprecated mod_jk2
>>supports bridge type of tomcat 4.x and up because it
>>tries to instantiate the class
>>org/apache/jk/apr/TomcatStarter.class which exists
>>in
>>tomcat-ajp.jar.
>>
>>I really dont understand why the mod_jk supports
>>tomcat 3.x only whereas the deprecated mod_jk2
>>supports tomcat 4.x and 5.x. Can somebody please
>>tell
>>me why?
>>
>>Also is it easy to have mod_jk to support
>>TC55_BRIDGE_TYPE? Based on the mod_jk source codes
>>jk_jni_worker.c, I think I just need to define the
>>TC55_JAVA_BRIDGE_CLASS_NAME to be
>>org/apache/jk/apr/TomcatStarter.class and then
>>assign
>>it to the btype. Is it just that simple?
>>
>>Another question is what the disadvantages of
>>running
>>tomcat inside the apache are. I googled and it seems
>>to me that not too many people try to run inprocess
>>tomcat inside apache. I would be interested in
>>adding
>>the 5.5 bridge type to the mod_jk.
>>
>>thanks,
>>Christine
>>
>>
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