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Date: Sun, 3 Jan 2010 14:09:33 +0300
Message-ID: <ef4ba9751001030309g1b8c6730wd9722901ceee362e@mail.gmail.com>
Subject: Re: Load balancing questions
From: assan alhamoud <hamoudassan@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>
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Happy new year to all ,

I am using tomcat and JBoss.

Tomcat/5.0.26
mod_jk/1.2.26

Regards,

2009/12/29 Mark Thomas <markt@apache.org>

> On 29/12/2009 16:17, assan alhamoud wrote:
> > Hello Mark  ,
> >
> > we are using apache  Server version: Apache/2.2.11 (Unix)
> > we use  mod_jk.so module
> > jboss-3.2.5
> > Tomcat5
> > and jrockit-jdk1.4.2_19
> >
> > at your disposal if you need more information
>
> Are you using Tomcat or JBoss?
> Tomcat version?
> mod_jk version?
>
> Mark
>
> >
> > Regards,
> > Ghassan
> >
> > 2009/12/29 Mark Thomas <markt@apache.org>
> >
> >> On 29/12/2009 15:21, assan alhamoud wrote:
> >>> Hello All
> >>>
> >>>  I have some questions and I hope to find answers about Load balancin=
g
> .
> >>>
> >>> 1- The first question , our DBA says that it not normal and no logic
>  to
> >>> have several instances of tomcat server on the same machine   with th=
e
> >> same
> >>>  configuration , is this correct ?
> >> No. Your DBA is wrong.
> >>
> >>> 2- Each tomcat instance here can serve about 125 user , and I have mo=
re
> >> than
> >>> this number on the server I got alot of problems and usually  the
> >> instance
> >>> hang , is there anyway to get better performance from tomcat.
> >> That isn't a Tomcat problem, that is an application problem. The
> >> solution is to fix/tune your application.
> >>
> >>>    I am using now 3G memory for each instance and 120 for max_pool_si=
ze
> >> and
> >>> 750 maxThread
> >> It isn't clear what the 125 users refers to. Is it concurrent requests=
,
> >> is it concurrent sessions, is it concurrent users (assuming 1 concurre=
nt
> >> user =3D=3D more than 1 concurrent request). From these numbers the
> >> application seems very resource intensive. It does appear that it woul=
d
> >> benefit from some tuning.
> >>
> >>> 3- The most critical issue I had  , when one instance hangs , apache
> >> hangs
> >>> and then all the application hangs because apache keep trying to
> connect
> >> to
> >>> the hanged instance , Is there any way to force apache to bypass the
> >> hanged
> >>> instance.
> >> Yes. But since you haven't told us the Tomcat version, httpd version n=
or
> >> how you are connecting httpd to Tomcat we can't tell you how to fix it=
.
> >>
> >>> 4- When instance of tomcat hangs , i forced to restart this instance =
(
> >>> tomcat server )  the problem is GC can not free memory anymore
> >>>     Is there anyway to solve the problem instead of restarting the
> >> server.
> >> Yes. Work out if you have a memory leak or need more memory than is
> >> available. If it is a memory leak, fix it. If you need more memory
> >> either allocate it or tune your app so it uses less.
> >>
> >>> 5- at last sometimes I found that the same action repeated many times
> >> which
> >>> means that apache sends the request more than one time to tomcat serv=
er
> >>> ,could I have control over this behavior.
> >> Maybe, maybe not. If this behaviour is initiated by the user agent you
> >> need to manage this in your app. It could also be caused by the
> >> fail-over mechanism, in which case I refer you to my answer to point 3
> >> above.
> >>
> >> Mark
> >>
> >>
> >>
> >> ---------------------------------------------------------------------
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> >>
> >>
> >
> >
>
>
>
>
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