Re: Load balancing questions
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 rfha...@yahoo.com wrote: --- On Wed, 1/6/10 at 7:54 AM, assan alhamoud hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- وداعاً ميخائيل
RE: Load balancing questions
From: assan alhamoud [mailto:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
we are using jboss-3.2.5 On Thu, Jan 7, 2010 at 5:05 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: From: assan alhamoud [mailto:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- وداعاً ميخائيل
RE: Load balancing questions
From: assan alhamoud [mailto:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
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.caldar...@unisys.com wrote: From: assan alhamoud [mailto:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- وداعاً ميخائيل
RE: Load balancing questions
From: assan alhamoud [mailto:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
any suggestion ?
On Tue, Jan 5, 2010 at 1:54 PM, assan alhamoud hamoudas...@gmail.comwrote:
Hello ,
*In Server.xml for Tomcat I have the following values*
!-- A HTTP/1.1 Connector on port 8080 --
Connector port=42591 address=${jboss.bind.address}
maxThreads=750 minSpareThreads=50 maxSpareThreads=150
enableLookups=false redirectPort=8443
connectionTimeout=2 disableUploadTimeout=true
useBodyEncodingForURI=true/
!-- A AJP 1.3 Connector on port 8009 --
Connector port=42510 address=${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=1
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 rfha...@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.
Re: Load balancing questions
--- On Wed, 1/6/10 at 7:54 AM, assan alhamoud hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
Hello ,
*In Server.xml for Tomcat I have the following values*
!-- A HTTP/1.1 Connector on port 8080 --
Connector port=42591 address=${jboss.bind.address}
maxThreads=750 minSpareThreads=50 maxSpareThreads=150
enableLookups=false redirectPort=8443
connectionTimeout=2 disableUploadTimeout=true
useBodyEncodingForURI=true/
!-- A AJP 1.3 Connector on port 8009 --
Connector port=42510 address=${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=1
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 rfha...@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
Re: Load balancing questions
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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
--- 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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For
Re: Load balancing questions
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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- وداعاً ميخائيل
Re: Load balancing questions
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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
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 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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- وداعاً ميخائيل
RE: Load balancing questions
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:hamoudas...@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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Load balancing questions
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-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
