Re: Tomcat is slow with router configured
Try using the IP address in the driver specification rather than the name of the machine. THat will tell you if it is a name resolution issue. Gary. On Dec 19, 2007 2:46 AM, Peter Crowther [EMAIL PROTECTED] wrote: From: Nabble-Member1 [mailto:[EMAIL PROTECTED] The web app is fast if I configured network bridge mode (both Web server and DB server have same subnet 192.168.1.x). But it is very slow if the network is configured as router mode (Web server and DB server is in different subnets - 192.168.1.1 for web, 196.168.2.1 for DB, the 2 boxes communicate via a router device). Is there settings in Tomcat to deal with this? No, and that's not a Tomcat issue. That sounds like a Windows issue, probably to do with NetBIOS name resolution or authentication timing out. What happens if you exclude Tomcat from the problem by writing a little Java app that connects to the database using the same driver that you're using for Tomcat? Is it still slow? If so, Tomcat isn't the problem. What happens if you configure a WINS server on one of the machines (or another box elsewhere on your network) and ensure both have it as their primary WINS server? Make sure both machines have actually registered with WINS, which can sometimes take a reboot, before you test. Or you could try using LMHOSTS to fix the problem. - Peter - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Gary Evesson
Re: Tomcat Clustering Support - Without any load balancer like component in the front
mod_jk handles failover for you. Clustering tomcat makes it copy sessions to all members of the clusters so that any member of the cluster can take over the processing of a request seamlessly from any other. If you requests have no way of getting to the other members of the cluster, then there is not much point in clustering. You can use something like pen or a dedicated load balancer to handle failover (and load balancing if you like) if you do not want to set up apache. On Nov 27, 2007 5:01 PM, mfs [EMAIL PROTECTED] wrote: Thanks for the quick reply Gary.. Some follow-up questions. 1) So the http server bundled with tomcat doesn't do any help ? like it doesnt provide any load-balancing implementation ? like e.g. mod-jk which has to be used in conjunction with apache...Further I presume mod-jk also handles the fail-over scenarios.. 2) When u say there is no huge amount of point, i wonder if there is any point AT ALL having that tomcat clustering enabled if we dont have something like a load-balancer/fail-over-service at the front? Thanks again Farhan. Gary Evesson-3 wrote: You need something to handle failover. Otherwise there is not a huge amount of point. Either a load balancer or mod-jk will do the job. On Nov 27, 2007 4:13 PM, mfs [EMAIL PROTECTED] wrote: Guys, Pretty basic question, given this is my time experience on clustering where i am trying to use tomcat 6 clustering support. So basically i wanted to know if enabling the tomcat 6 clustering would be of any use without having a load-balancer in the front (something like mod_jk) ? well my understanding so far is that we have to have some component in the front (which tomcat i assume doesn't provide...right ?) for either load-balancing or fail-over scenarios... Thanks in advance and REgards, Farhan. -- View this message in context: http://www.nabble.com/Tomcat-Clustering-Support---Without-any-load-balancer-like-component-in-the-front-tf4885156.html#a13982315 Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Gary Evesson -- View this message in context: http://www.nabble.com/Tomcat-Clustering-Support---Without-any-load-balancer-like-component-in-the-front-tf4885156.html#a13982961 Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Gary Evesson
Re: Tomcat implementation: please help
Try startup.bat. On Nov 26, 2007 8:01 AM, Patrick2901 [EMAIL PROTECTED] wrote: Hi, i'm using Windows XP SP2. Thanks, Patrick mgainty wrote: Hello Patrick- Which Operating System are you using to implement Tomcat? M- - Original Message - From: Patrick2901 [EMAIL PROTECTED] To: users@tomcat.apache.org Sent: Monday, November 26, 2007 9:16 AM Subject: Tomcat implementation: please help Hi, i'm new to Tomcat, i've downloaded Tomcat (5.5.25 Windows Installer) and am trying to do the Head First Servlets JSP- Book. In the book, it says that one can start Tomcat by entering %bin/startup.sh from the home directory (which is Tomcat 5.5). But in this directory, startup.sh does not exist. The way i got Tomcat running is by doubleclicking the file tomcat5w in the tomcat 5.5/bin/ directory. Do i miss anything? I need to know this as later in the book it says to shutdown by entering %bin/shutdown.sh, that isn't existing either. Thnaks, Patrick -- View this message in context: http://www.nabble.com/Tomcat-implementation%3A-please-help-tf4875257.html#a1 3949911 Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- View this message in context: http://www.nabble.com/Tomcat-implementation%3A-please-help-tf4875257.html#a13951367 Sent from the Tomcat - User mailing list archive at Nabble.com. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Gary Evesson
RE: Null
It's a classic! You should submit the conversation to
http://worsethanfailure.com/.
Gary Evesson
Decentrix Inc
-Original Message-
From: gb1071nx [mailto:[EMAIL PROTECTED]
Sent: Friday, June 29, 2007 12:13 PM
To: Tomcat Users List
Subject: RE: Null
Sigh.
-Original Message-
From: domenico di leo [mailto:[EMAIL PROTECTED]
Sent: Friday, June 29, 2007 1:10 PM
To: Tomcat Users List
Subject: Re: Null
Obviovusily you don't compare two string in this way!
if (null == rs.getString(col_foo))
The right manner is:
if (rs.getString(col_foo).equals(null)){
..
}
Your problem is Java not database
-
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RE: performance with apache and tomcat
Unless of course you need mod_rewrite. We also handle millions a day with exactly this set up. Gary Evesson Decentrix Inc -Original Message- From: Leon Rosenberg [mailto:[EMAIL PROTECTED] Sent: Thursday, April 19, 2007 1:30 PM To: Tomcat Users List Subject: Re: performance with apache and tomcat unless you explicitely need the httpd I wouldn't put it in front of tomcat, since besides less performance and security issues (last one like a month (?) ago with mod_jk) it doesn't bring you any benefits. Without knowing your requests (duration, resources they consume etc) its hard to make any estimations at all, but normally (whatever normally is) and on fair hardware 40 requests a second are easily served by one tomcat. So you could set up two machines with tomcats, put the traffic on one of them and let your hw loadbalancer perform the failover to the spare machine if needed. regards Leon P.S. There are indeed some real scenarios, where a httpd in front would be useful: down page, ssl, port 80 stress, but since you have a loadbalancer, it will be serving it much better as httpd, so use your lb features. On 4/19/07, Eqbal [EMAIL PROTECTED] wrote: Hello, We are planning on using Tomcat as the Servlet container for one of our production systems. I would like to know if there are any performance issues using it together with Apache webserver 2.0 and the ajp connector (using mod_rewrite). Is performance expected to be better if we double up Tomcat as a webserver and not use apache at all. I heard an opinion that using apache with tomcat may mean worse performance? The site is a medium traffic site with about 800 concurrent users, about 40 hits per second. We plan on using a hardware load balancer and we were not planning on putting the webserver outside the firewall, tomcat behind the firewall kind of configuration, so our webserver and app server are on the same hardware (Suse Linux). Original idea was to place static files on the webserver (apache 2.0) and servlets/jsps on Tomcat. I appreciate any feedback. Is this list searchable somewhere on the web? So I can search any pervious discussions on this topic? Thanks. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] smime.p7s Description: S/MIME cryptographic signature
RE: performance with apache and tomcat
There are a few things that can get you: Make sure you have sufficient threads available for the mod_jk connector on the Apache side. Port 8009 by default. The default value is frighteningly low and not up to any real load. Make sure that the machine has enough memory. That is the biggest issue that I encountered. As the number of connections mount, the amount of memory that both tomcat and apache need escalates very quickly. Once you get into swapping, you may as well pack up and go home. Tune the threads configuration in apache and your VM parameters carefully to avoid memory contention between apache and tomcat. My experience is that it is better to reduce the number of concurrent connections you can handle to avoid swapping. Gary Evesson Decentrix Inc -Original Message- From: Eqbal [mailto:[EMAIL PROTECTED] Sent: Thursday, April 19, 2007 2:27 PM To: Tomcat Users List Subject: RE: performance with apache and tomcat We will need to use SSL. What causes any performance overhead in using apache with Tomcat, considering they will be on the same server? --- Gary Evesson [EMAIL PROTECTED] wrote: Unless of course you need mod_rewrite. We also handle millions a day with exactly this set up. Gary Evesson Decentrix Inc -Original Message- From: Leon Rosenberg [mailto:[EMAIL PROTECTED] Sent: Thursday, April 19, 2007 1:30 PM To: Tomcat Users List Subject: Re: performance with apache and tomcat unless you explicitely need the httpd I wouldn't put it in front of tomcat, since besides less performance and security issues (last one like a month (?) ago with mod_jk) it doesn't bring you any benefits. Without knowing your requests (duration, resources they consume etc) its hard to make any estimations at all, but normally (whatever normally is) and on fair hardware 40 requests a second are easily served by one tomcat. So you could set up two machines with tomcats, put the traffic on one of them and let your hw loadbalancer perform the failover to the spare machine if needed. regards Leon P.S. There are indeed some real scenarios, where a httpd in front would be useful: down page, ssl, port 80 stress, but since you have a loadbalancer, it will be serving it much better as httpd, so use your lb features. On 4/19/07, Eqbal [EMAIL PROTECTED] wrote: Hello, We are planning on using Tomcat as the Servlet container for one of our production systems. I would like to know if there are any performance issues using it together with Apache webserver 2.0 and the ajp connector (using mod_rewrite). Is performance expected to be better if we double up Tomcat as a webserver and not use apache at all. I heard an opinion that using apache with tomcat may mean worse performance? The site is a medium traffic site with about 800 concurrent users, about 40 hits per second. We plan on using a hardware load balancer and we were not planning on putting the webserver outside the firewall, tomcat behind the firewall kind of configuration, so our webserver and app server are on the same hardware (Suse Linux). Original idea was to place static files on the webserver (apache 2.0) and servlets/jsps on Tomcat. I appreciate any feedback. Is this list searchable somewhere on the web? So I can search any pervious discussions on this topic? Thanks. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] smime.p7s Description: S/MIME cryptographic signature
Re: log4j exception only when stopping and starting a web application
On 2/27/07, Rachel Wilson [EMAIL PROTECTED] wrote: I am deploying an unpacked webapp directory to TOMCAT_HOME/webapps/myapp, If i (stop and) start tomcat then my application runs fine and the logging works fine. However if i stop the application (successfully, it seems) and restart it using Tomcats manager app then I get the following error: 2007-02-27 16:21:17,671 ERROR http-8080-Processor3 org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager] - FAIL - Application at context path /myapp could not be started java.lang.NullPointerException at org.apache.log4j.helpers.PatternConverter.spacePad(PatternConverter.java :106 ) at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:68) It looks like you have bad syntax in you log4j.properties file. -- Gary Evesson
Re: Can tomcat send out event about persistent connection being closed?
On 2/26/07, M M [EMAIL PROTECTED] wrote: Thanks for your reply. Our client application will always use keep-alive which is the default beahvior of HTTP/1.1 and it does not do simultaneous connections to the web server. Thanks. Monica Why use HTTP for a connection that is persistent? Wouldn't you be better off using RMI or some similar technology? HTTP was designed to be connectionless. The keepalive is an optimization trick, and is specifically layered beneath the ability of the programmer to utilize or control. -- Gary Evesson
RE: Peak load of Tomcat-powered server(s)?
Generally in a production environment, increasing the number of threads from the default is compulsory. You need to balance that against the amount of memory that you have allocated for your JVM, which needs to be balanced against the amount of memory available in the machine. Handling concurrent users generally comes back to the number of connections that your architecture can handle and how much work your database server(s) (assuming you have some) can handle. Our experience has been that these things become an issue before tomcat does. It depends on your application *a lot*. Nothing beats real load testing to figure out where *your* stress points are. They are probably going to be different to other people... Gary -Original Message- From: Li Ma [mailto:[EMAIL PROTECTED] Sent: Sunday, December 24, 2006 12:35 PM To: Tomcat Users List Subject: Re: Peak load of Tomcat-powered server(s)? Actually you can imagine the server serves a site like mySpace where people can access their own home, blog, images, forum, etc. I know it is still not easy to answer, but I'm not looking for an answer to my specific question. I'm just looking for any similiar experience that can be shared and hoping I can learn some. Another question, how many threads do you think Tomcat can have on one machine? And will increasing number of threads help processing more requests? I think 100-150 per server per second is not a good number. But if it is true, does that mean Tomcat is not suitable for large website? And what does commercial products like WebLogic can normally do? Well, lots of question at my end. Thanks for sharing of your idea. Any thing will help. Best! Li On 12/24/06, Leon Rosenberg [EMAIL PROTECTED] wrote: The question is impossible to answer, since you don't tell us what a user will do :-) However, to give you an example, if your requests are somewhat normal-web-requests (producing html) than going for 100-150 per second and server should be a reasonable value. regards Leon P.S. Of course it depends hardly on your use-cases... for example your apache in front of tomcat could reduce the performance by 10% without giving you anything in exchange. On 12/24/06, Li Ma [EMAIL PROTECTED] wrote: I need to setup for a client to run a myspace-like site. My client kept asking me how many concurrent user's I can support. I really don't know the answer. We will use Apache, jk_mod, Tomcat and Oracle(clustered). We will use X86 servers with Linux. Can anyone share your experience and let me know the best load you have achieved? Thanks a lot and Merry Christmas! -- Li Ma [EMAIL PROTECTED] http://www.idealtechs.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Li Ma [EMAIL PROTECTED] http://www.idealtechs.com - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat 5.0.28 memory leak
[EMAIL PROTECTED] wrote: Why do I have to make my class serializable.It is a simple web application using the MemberData class for storing some data??? Because you are pushing it onto the session. - Gary - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat 5.0.28 memory leak
[EMAIL PROTECTED] wrote: Yes I am putting it out in the session but I get the error after the service has broken and at that point its probably trying to persist data??? and that should be serializable. My issue is why doesthe service break in the first place? I am just doing refesh on a page several times?? The breakage of the service is not indicated in the exception that you have sent. This is the container attempting to persist the sessions as the web app is shutting down. Assuming the class you are adding to the session is simple, then the standard serialization will work fine. Just make your class implement Serializable. You need to investigate further. I was reading this could this be an issue? http://issues.apache.org/bugzilla/show_bug.cgi?id=36541 Unlikely. The exception is not related to that. Concurrency issues such as this would require significant load from one user. I assume that you are not generating high load? - Gary - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: SSL Handshake before parameters sent???
Depends how they are sent. Parameters sent in a POST will be encrypted using SSL. No user interaction required. Parameters sent using GET will not be encrypted unless you do it yourself. Gary Evesson Decentrix Inc -Original Message- From: John MccLain [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 22, 2005 2:39 PM To: Tomcat user list Subject: SSL Handshake before parameters sent??? We have a servlet that is served by Tomcat. IIS is employed to redirect ot Tomcat via AJP. IIS is also SSL enabled as our data is sensistive. I wish to call a servlet and pass SSL encrypted data. BUT, to start the SSL handshake off, I am making a servlet request with the data I wish to be SSL encrypted. My question is If I call a servlet from a browser and pass the servlet some parameters that need to be sent encrypted, do the parameters get SSL encrypted BEFORE they are sent, or are they sent clear text, then the SSL Handshake, then all other data sent is encrypted? John McClain Senior Software Engineer TCS Healthcare [EMAIL PROTECTED] (530)886-1700x235 Skepticism is the first step toward truth - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] smime.p7s Description: S/MIME cryptographic signature
