I think you should use timeout !
It seems that your request take a long time to be computed by your tomcats.
If you reach the max connections (http or ajp ) then you have to wait for
tomcat response to free a connection slot.
What says your jk_status page ? are all your workers in error state ? how
many busy connections do you have ?
You can :
- in httpd.conf :
+if your using keepalive, add a keepalive timeout. 5,10 or 15 s may
be enough.
+ if your using mpm_winnt, increase ThreadsPerChild value to
increase max available connections.
- in workers.properties :
+ worker.yourworker.reply_timeout=30000. after 30s without
response, the connection will try another worker or fail.
+ limit your
connection_pool_size if your are in multi thread httpd mode. You may
have on connection per thread which can
overload your tomcats.
- in your tomcat : increase your AJP connectors maxThreads. 200 by default.
It's no very efficient to have too much thread but it can prevent you from
refused connections.
--
Bj
http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html
On 9/17/07, James Sherwood <[EMAIL PROTECTED]> wrote:
>
> Hello,
>
> CORRECTED(status page working now)
>
> We upgraded to the latest mod_jk and this were the results:
>
> 1: All monitors were fine, there were no bottlenecks anywhere that we
> could find(cpu's,HD's and networks all seemed fine).
> 2: This time when we brought the servers to their knees, they recovered a
> short time after the test was completed.
> 3: We tried the socket_keepalive=true for the workers and the server did
> not recover after
> 4: the only problem we can find is after the test in the mod_jk log we
> have about 20-30 lines of this:
> [Mon Sep 17 08:03:49.906 2007] [7948:4868] [error] jk_ajp_common.c (2097):
> (tomcat5) Connecting to tomcat failed. Tomcat is probably not started or is
> listening on the wrong port
>
> The lines vary only by the (tomcat5) being any of the tomcats in the
> loadbalance.
>
> It seems like apache/tomcat/mod_jk are reaching the max number of
> connections between each other or something?
>
> Any help would be GREATLY appreciated,
> --James
>
> ----- Original Message -----
> *From:* James Sherwood <[EMAIL PROTECTED]>
> *To:* users@httpd.apache.org
> *Sent:* Monday, September 17, 2007 9:12 AM
> *Subject:* Re: [EMAIL PROTECTED] Load balancing question
>
> Hello,
>
> I cannot get my mod_jk status page to work. Maybe it is because I am on
> windows?
>
> It seems:
>
> worker.list=jk-manage
> worker.jk-manage.type=status
> worker.jk-manage.mount=/admin/status/jk
> only takes a linux style path for the mount?
>
> We upgraded to the latest mod_jk and this were the results:
>
> 1: All monitors were fine, there were no bottlenecks anywhere that we
> could find(cpu's,HD's and networks all seemed fine).
> 2: This time when we brought the servers to their knees, they recovered a
> short time after the test was completed.
> 3: We tried the socket_keepalive=true for the workers and the server did
> not recover after
> 4: the only problem we can find is after the test in the mod_jk log we
> have about 20-30 lines of this:
> [Mon Sep 17 08:03:49.906 2007] [7948:4868] [error] jk_ajp_common.c (2097):
> (tomcat5) Connecting to tomcat failed. Tomcat is probably not started or is
> listening on the wrong port
>
> The lines vary only by the (tomcat5) being any of the tomcats in the
> loadbalance.
>
> It seems like apache/tomcat/mod_jk are reaching the max number of
> connections between each other or something?
>
> Any help would be GREATLY appreciated,
> --James
>
>
>
>
>
> ----- Original Message -----
> *From:* Bj <[EMAIL PROTECTED]>
> *To:* users@httpd.apache.org
> *Sent:* Saturday, September 15, 2007 5:17 AM
> *Subject:* Re: [EMAIL PROTECTED] Load balancing question
>
> What says your mod_jk status page ?
> try to monitor during the load to see if your workers are in error or OK
> state, il the max busy is reached,....
> Then look at your logs (mod_jk, apache, tomcat, webapps logs, windows,...)
>
>
> As said before, you should check the number of tcp connections opened. If
> your do not use keep alive feature you can have a bootleneck there (apache
> and tomcat servers).You can also have error like max opened file reached.
> Then look at the load average,system cpu, iowait,..
>
> You can also monitor your tomcats through JMX (using jconsole or
> missioncontrol) to check that garbage collections works fine and just don't
> hang up too long.
>
> try to deactivate the 2 tomcat instances on your apache server to see if
> httpd is still available after the load test.
>
> --
> Bj
>
>
> On 9/14/07, James Sherwood <[EMAIL PROTECTED]> wrote:
> >
> > Hello,
> >
> > Everything is Windows2003 Server.
> >
> > After the load we cannot load pages either through apache or by
> > contacting
> > tomcat directly.
> >
> > I beleive you are on the right path tho, about connections not getting
> > released, thats what I figure it is too but I do not know how to fix it.
> >
> > Thanks,
> > James
> >
> >
> > ----- Original Message -----
> > From: "AFrieze" <[EMAIL PROTECTED] >
> > To: <users@httpd.apache.org>
> > Sent: Friday, September 14, 2007 12:02 PM
> > Subject: Re: [EMAIL PROTECTED] Load balancing question
> >
> >
> > >
> > >>
> > >> We also have the problem of once the load stops, the sites are still
> > down
> > >> but Apache/tomcats still seem to be running fine. A restart of
> > >> either(not even both) fixes the sites.
> > > A guess
> > >
> > > Your apache server is not releasing connections. If you are running
> > > linux, type "netstat -vat" into a terminal on your apache machine,
> > before
> > > and after you hit your server. See if the connections are being
> > released.
> > >
> > > You could also try typing "ps -e | grep "httpd"" to see how many
> > apache
> > > processes are being run before/after. Look in the apache error log,
> > etc.
> > > You might find a clue like "MaxClients reached"
> > >
> > > Question
> > > Are you able to log into all your tomcats(through port 8080)
> > independent
> > > of apache and get served requests? Can you log onto apache and get a
> > > statically served page?
> > >
> > > Cheers
> > > AFrieze
> > >
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