You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by assan alhamoud <ha...@gmail.com> on 2009/12/29 16:21:05 UTC
Load balancing questions
Hello All
I have some questions and I hope to find answers about Load balancing .
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 the same
configuration , is this correct ?
2- Each tomcat instance here can serve about 125 user , and I have more 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.
I am using now 3G memory for each instance and 120 for max_pool_size and
750 maxThread
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.
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.
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 server
,could I have control over this behavior.
--
������ �������
RE: Load balancing questions
Posted by Ge...@gta-travel.com.
Hi Ghassan,
It looks like you might be using a default/old version of modjk. I would
recommend as a start to either download the latest binary release or
compile a custom version for your distribution. It is really
straightforward to do the compile and everything you need to know is in
the documentation and readme files. You can download the latest version
here:
http://tomcat.apache.org/download-connectors.cgi
Regards
> -----Original Message-----
> From: assan alhamoud [mailto:hamoudassan@gmail.com]
> Sent: 29 December 2009 16:18
> To: Tomcat Users List
> Subject: Re: Load balancing questions
>
> 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
>
> Regards,
> Ghassan
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
RE: Load balancing questions
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: assan alhamoud [mailto:hamoudassan@gmail.com]
> Subject: Re: Load balancing questions
>
> Is there any link that help me in this upgrade ?
I'd look at jboss.org and browse the community support area.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
Not yet , I am going to test although the company that made the product
says it is not possible .
Is there any link that help me in this upgrade ?
On Thu, Jan 7, 2010 at 5:18 PM, Caldarale, Charles R <
Chuck.Caldarale@unisys.com> wrote:
> > From: assan alhamoud [mailto:hamoudassan@gmail.com]
> > Subject: Re: Load balancing questions
> >
> > we are using jboss-3.2.5
>
> That's 5.5 years old; you should try to keep up a bit more often than that.
>
> Regardless, have you tried moving to Jboss 5.x?
>
> - Chuck
>
>
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is thus for use only by the intended recipient. If you received
> this in error, please contact the sender and delete the e-mail and its
> attachments from all computers.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
RE: Load balancing questions
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: assan alhamoud [mailto:hamoudassan@gmail.com]
> Subject: Re: Load balancing questions
>
> we are using jboss-3.2.5
That's 5.5 years old; you should try to keep up a bit more often than that.
Regardless, have you tried moving to Jboss 5.x?
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
we are using jboss-3.2.5
On Thu, Jan 7, 2010 at 5:05 PM, Caldarale, Charles R <
Chuck.Caldarale@unisys.com> wrote:
> > From: assan alhamoud [mailto:hamoudassan@gmail.com]
> > Subject: Re: Load balancing questions
> >
> > The application is not compatible with Jboss 5
>
> That's difficult to believe. We haven't found anything from JBoss 4.x that
> didn't work with 5.x.
>
> Have you tried it?
>
> - Chuck
>
>
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is thus for use only by the intended recipient. If you received
> this in error, please contact the sender and delete the e-mail and its
> attachments from all computers.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
RE: Load balancing questions
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: assan alhamoud [mailto:hamoudassan@gmail.com]
> Subject: Re: Load balancing questions
>
> The application is not compatible with Jboss 5
That's difficult to believe. We haven't found anything from JBoss 4.x that didn't work with 5.x.
Have you tried it?
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
The application is not compatible with Jboss 5 ,so I could not make the
upgrade.
And I don't have the source.
On Wed, Jan 6, 2010 at 10:09 PM, Bob Hall <rf...@yahoo.com> wrote:
> --- On Wed, 1/6/10 at 7:54 AM, assan alhamoud <ha...@gmail.com>
> wrote:
>
> > any suggestion ?
> >
>
> Upgrade to a more recent version of JBoss/Tomcat, like JBoss 5.1.0.
>
> - Bob
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
Re: Load balancing questions
Posted by Bob Hall <rf...@yahoo.com>.
--- On Wed, 1/6/10 at 7:54 AM, assan alhamoud <ha...@gmail.com> wrote:
> any suggestion ?
>
Upgrade to a more recent version of JBoss/Tomcat, like JBoss 5.1.0.
- Bob
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
any suggestion ?
On Tue, Jan 5, 2010 at 1:54 PM, assan alhamoud <ha...@gmail.com>wrote:
> Hello ,
>
> *In Server.xml for Tomcat I have the following values*
>
> <!-- A HTTP/1.1 Connector on port 8080 -->
> <Connector port="42591" address="${jboss.bind.address}"
> maxThreads="750" minSpareThreads="50" maxSpareThreads="150"
> enableLookups="false" redirectPort="8443"
> connectionTimeout="20000" disableUploadTimeout="true"
> useBodyEncodingForURI="true"/>
>
> <!-- A AJP 1.3 Connector on port 8009 -->
> <Connector port="42510" address="${jboss.bind.address}"
> minSpareThreads="50" maxSpareThreads="150"
> enableLookups="false" redirectPort="8443" debug="0"
> minThreads="40" minProcessors="40" maxProcessors="500"
> protocol="AJP/1.3" acceptCount="100"
> useBodyEncodingForURI="true" connectionTimeout="7000"
> maxThreads="750"/>
>
>
> *and in workers.properties I have the following values*
> *
> *
> worker.server1.port=42510
> worker.server1.host=X.X.X.X
> worker.server1.type=ajp13
> worker.server1.lbfactor=1
> worker.server1.connect_timeout=10000
> worker.server1.prepost_timeout=2000
> worker.server1.socket_keepalive=True
>
> *and I am going to add the following *
> reply_timeout
> max_reply_timeouts
> retries =1
> retry_interval
> recovery_options=1
> socket_timeout
> connection_pool_size
> connection_pool_timeout
>
> Do you suggest values for them ? and do you recommend adding
> other parameters ?
>
> Notes :
> 1- I upgraded mod_jk
> 2- upgrade tomcat is not easy to do , I have some questions about this ,
> but now I am concentrating on tuning the parameters first.
> 3- I have long garbage collection pauses GC 2993642K->1550690K (3145728K),
> 5590.496 ms
>
>
>
> On Mon, Jan 4, 2010 at 12:54 PM, Bob Hall <rf...@yahoo.com> wrote:
>
>>
>>
>> --- On Mon, 1/4/10 at 1:34 AM, Mark Thomas <ma...@apache.org> wrote:
>>
>> > On 03/01/2010 11:09, assan alhamoud
>> > wrote:
>> > > Happy new year to all ,
>> > >
>> > > I am using tomcat and JBoss.
>> >
>> > You'll need to explain that further. Why would you use
>> > Tomcat and JBoss
>> > for the same app. I would expect one or the other.
>> >
>> > > Tomcat/5.0.26
>> >
>> > That is very, very old and has many known bugs and a number
>> > of security
>> > vulnerabilities. I'd strongly suggest moving to 5.5.28.
>>
>> JBoss 3.2.5 has Tomcat 5.0 embedded (both very old versions)
>>
>> JBoss 4.0.3 has Tomcat 5.5 embedded (both old versions)
>>
>> Current version of JBoss is 6.0 not sure what version of Tomcat is
>> embedded,
>> http://community.jboss.org isn't responding...
>>
>> - Bob
>>
>> >
>> > > mod_jk/1.2.26
>> >
>> > Also worth upgrading to the latest version
>> >
>> >
>> > To get back to your original question, it looks like your
>> > app could
>> > benefit from some tuning. The hanging is likely to be
>> > caused by long
>> > running requests using up all the connections between httpd
>> > and Tomcat
>> > and/or poor mod_jk / AJP connector configuration. Since you
>> > haven't
>> > shown us this configuration it is hard to provide specific
>> > advice but
>> > generally I would suggest:
>> > - use JkOptions +DisableReuse (or sort out your timeouts
>> > but my
>> > experience has been disable reuse is simpler to configure
>> > and has
>> > similar performance)
>> > - turn on access logging for Tomcat
>> > - check any timeouts are consistent with your longest
>> > running requests
>> > - ensure the following are compatible
>> > - httpd processes/threads
>> > - Tomcat AJP connector threads
>> > - mod_jk connection pooling
>> >
>> > Mark
>> >
>> > >
>> > > Regards,
>> > >
>> > > 2009/12/29 Mark Thomas <ma...@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 <ma...@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 balancing
>> > >> .
>> > >>>>>
>> > >>>>> 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 the
>> > >>>> same
>> > >>>>> configuration , is this correct
>> > ?
>> > >>>> No. Your DBA is wrong.
>> > >>>>
>> > >>>>> 2- Each tomcat instance here can serve
>> > about 125 user , and I have more
>> > >>>> 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_size
>> > >>>> 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 concurrent
>> > >>>> user == more than 1 concurrent request).
>> > From these numbers the
>> > >>>> application seems very resource intensive.
>> > It does appear that it would
>> > >>>> 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 nor
>> > >>>> 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 server
>> > >>>>> ,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
>> > >>>>
>> > >>>>
>> > >>>>
>> > >>>>
>> > ---------------------------------------------------------------------
>> > >>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> > >>>> For additional commands, e-mail: users-help@tomcat.apache.org
>> > >>>>
>> > >>>>
>> > >>>
>> > >>>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > ---------------------------------------------------------------------
>> > >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> > >> For additional commands, e-mail: users-help@tomcat.apache.org
>> > >>
>> > >>
>> > >
>> > >
>> >
>> >
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> > For additional commands, e-mail: users-help@tomcat.apache.org
>> >
>> >
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>
>
> --
> وداعاً ميخائيل
>
--
وداعاً ميخائيل
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
Hello ,
*In Server.xml for Tomcat I have the following values*
<!-- A HTTP/1.1 Connector on port 8080 -->
<Connector port="42591" address="${jboss.bind.address}"
maxThreads="750" minSpareThreads="50" maxSpareThreads="150"
enableLookups="false" redirectPort="8443"
connectionTimeout="20000" disableUploadTimeout="true"
useBodyEncodingForURI="true"/>
<!-- A AJP 1.3 Connector on port 8009 -->
<Connector port="42510" address="${jboss.bind.address}"
minSpareThreads="50" maxSpareThreads="150"
enableLookups="false" redirectPort="8443" debug="0" minThreads="40"
minProcessors="40" maxProcessors="500"
protocol="AJP/1.3" acceptCount="100"
useBodyEncodingForURI="true" connectionTimeout="7000"
maxThreads="750"/>
*and in workers.properties I have the following values*
*
*
worker.server1.port=42510
worker.server1.host=X.X.X.X
worker.server1.type=ajp13
worker.server1.lbfactor=1
worker.server1.connect_timeout=10000
worker.server1.prepost_timeout=2000
worker.server1.socket_keepalive=True
*and I am going to add the following *
reply_timeout
max_reply_timeouts
retries =1
retry_interval
recovery_options=1
socket_timeout
connection_pool_size
connection_pool_timeout
Do you suggest values for them ? and do you recommend adding
other parameters ?
Notes :
1- I upgraded mod_jk
2- upgrade tomcat is not easy to do , I have some questions about this , but
now I am concentrating on tuning the parameters first.
3- I have long garbage collection pauses GC 2993642K->1550690K
(3145728K), 5590.496
ms
On Mon, Jan 4, 2010 at 12:54 PM, Bob Hall <rf...@yahoo.com> wrote:
>
>
> --- On Mon, 1/4/10 at 1:34 AM, Mark Thomas <ma...@apache.org> wrote:
>
> > On 03/01/2010 11:09, assan alhamoud
> > wrote:
> > > Happy new year to all ,
> > >
> > > I am using tomcat and JBoss.
> >
> > You'll need to explain that further. Why would you use
> > Tomcat and JBoss
> > for the same app. I would expect one or the other.
> >
> > > Tomcat/5.0.26
> >
> > That is very, very old and has many known bugs and a number
> > of security
> > vulnerabilities. I'd strongly suggest moving to 5.5.28.
>
> JBoss 3.2.5 has Tomcat 5.0 embedded (both very old versions)
>
> JBoss 4.0.3 has Tomcat 5.5 embedded (both old versions)
>
> Current version of JBoss is 6.0 not sure what version of Tomcat is
> embedded,
> http://community.jboss.org isn't responding...
>
> - Bob
>
> >
> > > mod_jk/1.2.26
> >
> > Also worth upgrading to the latest version
> >
> >
> > To get back to your original question, it looks like your
> > app could
> > benefit from some tuning. The hanging is likely to be
> > caused by long
> > running requests using up all the connections between httpd
> > and Tomcat
> > and/or poor mod_jk / AJP connector configuration. Since you
> > haven't
> > shown us this configuration it is hard to provide specific
> > advice but
> > generally I would suggest:
> > - use JkOptions +DisableReuse (or sort out your timeouts
> > but my
> > experience has been disable reuse is simpler to configure
> > and has
> > similar performance)
> > - turn on access logging for Tomcat
> > - check any timeouts are consistent with your longest
> > running requests
> > - ensure the following are compatible
> > - httpd processes/threads
> > - Tomcat AJP connector threads
> > - mod_jk connection pooling
> >
> > Mark
> >
> > >
> > > Regards,
> > >
> > > 2009/12/29 Mark Thomas <ma...@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 <ma...@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 balancing
> > >> .
> > >>>>>
> > >>>>> 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 the
> > >>>> same
> > >>>>> configuration , is this correct
> > ?
> > >>>> No. Your DBA is wrong.
> > >>>>
> > >>>>> 2- Each tomcat instance here can serve
> > about 125 user , and I have more
> > >>>> 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_size
> > >>>> 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 concurrent
> > >>>> user == more than 1 concurrent request).
> > From these numbers the
> > >>>> application seems very resource intensive.
> > It does appear that it would
> > >>>> 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 nor
> > >>>> 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 server
> > >>>>> ,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
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > ---------------------------------------------------------------------
> > >>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >>>> For additional commands, e-mail: users-help@tomcat.apache.org
> > >>>>
> > >>>>
> > >>>
> > >>>
> > >>
> > >>
> > >>
> > >>
> > >>
> > ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > >> For additional commands, e-mail: users-help@tomcat.apache.org
> > >>
> > >>
> > >
> > >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
Re: Load balancing questions
Posted by Bob Hall <rf...@yahoo.com>.
--- On Mon, 1/4/10 at 1:34 AM, Mark Thomas <ma...@apache.org> wrote:
> On 03/01/2010 11:09, assan alhamoud
> wrote:
> > Happy new year to all ,
> >
> > I am using tomcat and JBoss.
>
> You'll need to explain that further. Why would you use
> Tomcat and JBoss
> for the same app. I would expect one or the other.
>
> > Tomcat/5.0.26
>
> That is very, very old and has many known bugs and a number
> of security
> vulnerabilities. I'd strongly suggest moving to 5.5.28.
JBoss 3.2.5 has Tomcat 5.0 embedded (both very old versions)
JBoss 4.0.3 has Tomcat 5.5 embedded (both old versions)
Current version of JBoss is 6.0 not sure what version of Tomcat is embedded,
http://community.jboss.org isn't responding...
- Bob
>
> > mod_jk/1.2.26
>
> Also worth upgrading to the latest version
>
>
> To get back to your original question, it looks like your
> app could
> benefit from some tuning. The hanging is likely to be
> caused by long
> running requests using up all the connections between httpd
> and Tomcat
> and/or poor mod_jk / AJP connector configuration. Since you
> haven't
> shown us this configuration it is hard to provide specific
> advice but
> generally I would suggest:
> - use JkOptions +DisableReuse (or sort out your timeouts
> but my
> experience has been disable reuse is simpler to configure
> and has
> similar performance)
> - turn on access logging for Tomcat
> - check any timeouts are consistent with your longest
> running requests
> - ensure the following are compatible
> - httpd processes/threads
> - Tomcat AJP connector threads
> - mod_jk connection pooling
>
> Mark
>
> >
> > Regards,
> >
> > 2009/12/29 Mark Thomas <ma...@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 <ma...@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 balancing
> >> .
> >>>>>
> >>>>> 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 the
> >>>> same
> >>>>> configuration , is this correct
> ?
> >>>> No. Your DBA is wrong.
> >>>>
> >>>>> 2- Each tomcat instance here can serve
> about 125 user , and I have more
> >>>> 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_size
> >>>> 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 concurrent
> >>>> user == more than 1 concurrent request).
> From these numbers the
> >>>> application seems very resource intensive.
> It does appear that it would
> >>>> 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 nor
> >>>> 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 server
> >>>>> ,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
> >>>>
> >>>>
> >>>>
> >>>>
> ---------------------------------------------------------------------
> >>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >>>> For additional commands, e-mail: users-help@tomcat.apache.org
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >
> >
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by Mark Thomas <ma...@apache.org>.
On 03/01/2010 11:09, assan alhamoud wrote:
> Happy new year to all ,
>
> I am using tomcat and JBoss.
You'll need to explain that further. Why would you use Tomcat and JBoss
for the same app. I would expect one or the other.
> Tomcat/5.0.26
That is very, very old and has many known bugs and a number of security
vulnerabilities. I'd strongly suggest moving to 5.5.28.
> mod_jk/1.2.26
Also worth upgrading to the latest version
To get back to your original question, it looks like your app could
benefit from some tuning. The hanging is likely to be caused by long
running requests using up all the connections between httpd and Tomcat
and/or poor mod_jk / AJP connector configuration. Since you haven't
shown us this configuration it is hard to provide specific advice but
generally I would suggest:
- use JkOptions +DisableReuse (or sort out your timeouts but my
experience has been disable reuse is simpler to configure and has
similar performance)
- turn on access logging for Tomcat
- check any timeouts are consistent with your longest running requests
- ensure the following are compatible
- httpd processes/threads
- Tomcat AJP connector threads
- mod_jk connection pooling
Mark
>
> Regards,
>
> 2009/12/29 Mark Thomas <ma...@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 <ma...@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 balancing
>> .
>>>>>
>>>>> 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 the
>>>> same
>>>>> configuration , is this correct ?
>>>> No. Your DBA is wrong.
>>>>
>>>>> 2- Each tomcat instance here can serve about 125 user , and I have more
>>>> 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_size
>>>> 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 concurrent
>>>> user == more than 1 concurrent request). From these numbers the
>>>> application seems very resource intensive. It does appear that it would
>>>> 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 nor
>>>> 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 server
>>>>> ,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
>>>>
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>
>>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
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 <ma...@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 <ma...@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 balancing
> .
> >>>
> >>> 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 the
> >> same
> >>> configuration , is this correct ?
> >> No. Your DBA is wrong.
> >>
> >>> 2- Each tomcat instance here can serve about 125 user , and I have more
> >> 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_size
> >> 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 concurrent
> >> user == more than 1 concurrent request). From these numbers the
> >> application seems very resource intensive. It does appear that it would
> >> 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 nor
> >> 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 server
> >>> ,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
> >>
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> >> For additional commands, e-mail: users-help@tomcat.apache.org
> >>
> >>
> >
> >
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
Re: Load balancing questions
Posted by Mark Thomas <ma...@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 <ma...@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 balancing .
>>>
>>> 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 the
>> same
>>> configuration , is this correct ?
>> No. Your DBA is wrong.
>>
>>> 2- Each tomcat instance here can serve about 125 user , and I have more
>> 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_size
>> 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 concurrent
>> user == more than 1 concurrent request). From these numbers the
>> application seems very resource intensive. It does appear that it would
>> 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 nor
>> 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 server
>>> ,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
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
Re: Load balancing questions
Posted by assan alhamoud <ha...@gmail.com>.
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
Regards,
Ghassan
2009/12/29 Mark Thomas <ma...@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 balancing .
> >
> > 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 the
> same
> > configuration , is this correct ?
> No. Your DBA is wrong.
>
> > 2- Each tomcat instance here can serve about 125 user , and I have more
> 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_size
> 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 concurrent
> user == more than 1 concurrent request). From these numbers the
> application seems very resource intensive. It does appear that it would
> 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 nor
> 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 server
> > ,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
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
--
وداعاً ميخائيل
Re: Load balancing questions
Posted by Mark Thomas <ma...@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 balancing .
>
> 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 the same
> configuration , is this correct ?
No. Your DBA is wrong.
> 2- Each tomcat instance here can serve about 125 user , and I have more 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_size 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 concurrent
user == more than 1 concurrent request). From these numbers the
application seems very resource intensive. It does appear that it would
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 nor
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 server
> ,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
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org