Re: How to load-balance on AWS with standalone Tomcats
Hi, In that case I think you don't need custom IPageStore too. It will be redundant. When a request comes Wicket tries to load the page from the HTTP session first. If it is found there then it stores it at the end of the request cycle both in the http session and in the disk (IPageStore). Since you will have a bigger http session (ElastiCache) then I think there is no need to copy the same data second time with a custom IPageStore impl. I don't remember how all this works in 1.4.x, so what I say is for 1.5.0+. This part of Wicket (IPageStore, IDataStore) has been reworked for 1.5.0 but I guess there are no big architectural changes, just implementation changes. Please let us know how things go! Good luck! Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Tue, Mar 10, 2015 at 11:26 AM, Daniel Del Castillo dani...@optimad.com wrote: Hi Martin, Thanks a lot for your prompt response, that's very helpful. With regards the session affinity, we'll have a Tomcat Session Manager, which is going to serialise sessions into ElastiCache, configured for each Tomcat instance with the same parameters and this should free us from sticky sessions. Is there any other concerns that I should take into account with regards Wicket Sessions in an environment like this? Regards, DDC -Original Message- From: Martin Grigorov [mailto:mgrigo...@apache.org] Sent: 09 March 2015 21:26 To: users@wicket.apache.org Subject: Re: How to load-balance on AWS with standalone Tomcats Hi, I think it would be much simpler if you use Tomcat clustering support. Wicket 1.4.x is a bit old but as far as I remember the support for it in Wicket has been introduced with 1.4.1 so it should work fine in 1.4.17. But if Tomcat clustering in not an option for you for some reason then: - make sure you use session affinity (aka sticky sessions) - create your own IPageStore to keep the serialized view of the pages in shared DB (as you already figured out) - no need of custom ISessionStore. You need custom one only in case you want to put your Wicket Session instances in something else than HTTP Session I guess you are not interested in upgrading to Wicket 6.x but I'd recommend you to upgrade at least to 1.4.22. There were some security fixes in the last few releases from 1.4.x series. Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Mon, Mar 9, 2015 at 6:09 PM, Daniel Del Castillo dani...@optimad.com wrote: Hi list, One of the modules of our application is completely written in Wicket 1.4.17. This application runs on a single standalone Tomcat installation. We now need to move this to AWS servers and ensure the service is 24/7 available. We are looking to have multiple Tomcat instances (not a cluster) which are load-balanced with ELB. My question is: what do I we need to do in order to achieve this? I now we'll have to write a IPageStore in order to serialise the page map into a shared database. Any suggestion on how to do this? Will we have to write a ISessionStore as well? I've found a solution for clustering (see link below) which I'm now about to test but I've thought that it'd be useful to try get some advice from this list. http://letsgetdugg.com/2010/02/07/clustering-wicket-for-fun-and-profit / Many thanks for your help. Regards, Daniel DDC -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. -- - -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. ---
RE: How to load-balance on AWS with standalone Tomcats
Hi Martin, Thanks a lot for your prompt response, that's very helpful. With regards the session affinity, we'll have a Tomcat Session Manager, which is going to serialise sessions into ElastiCache, configured for each Tomcat instance with the same parameters and this should free us from sticky sessions. Is there any other concerns that I should take into account with regards Wicket Sessions in an environment like this? Regards, DDC -Original Message- From: Martin Grigorov [mailto:mgrigo...@apache.org] Sent: 09 March 2015 21:26 To: users@wicket.apache.org Subject: Re: How to load-balance on AWS with standalone Tomcats Hi, I think it would be much simpler if you use Tomcat clustering support. Wicket 1.4.x is a bit old but as far as I remember the support for it in Wicket has been introduced with 1.4.1 so it should work fine in 1.4.17. But if Tomcat clustering in not an option for you for some reason then: - make sure you use session affinity (aka sticky sessions) - create your own IPageStore to keep the serialized view of the pages in shared DB (as you already figured out) - no need of custom ISessionStore. You need custom one only in case you want to put your Wicket Session instances in something else than HTTP Session I guess you are not interested in upgrading to Wicket 6.x but I'd recommend you to upgrade at least to 1.4.22. There were some security fixes in the last few releases from 1.4.x series. Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Mon, Mar 9, 2015 at 6:09 PM, Daniel Del Castillo dani...@optimad.com wrote: Hi list, One of the modules of our application is completely written in Wicket 1.4.17. This application runs on a single standalone Tomcat installation. We now need to move this to AWS servers and ensure the service is 24/7 available. We are looking to have multiple Tomcat instances (not a cluster) which are load-balanced with ELB. My question is: what do I we need to do in order to achieve this? I now we'll have to write a IPageStore in order to serialise the page map into a shared database. Any suggestion on how to do this? Will we have to write a ISessionStore as well? I've found a solution for clustering (see link below) which I'm now about to test but I've thought that it'd be useful to try get some advice from this list. http://letsgetdugg.com/2010/02/07/clustering-wicket-for-fun-and-profit / Many thanks for your help. Regards, Daniel DDC -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. -- - -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. ---
RE: How to load-balance on AWS with standalone Tomcats
Thanks for the input! I will let you know how it goes. Cheers! DDC -Original Message- From: Martin Grigorov [mailto:mgrigo...@apache.org] Sent: 10 March 2015 11:18 To: users@wicket.apache.org Subject: Re: How to load-balance on AWS with standalone Tomcats Hi, In that case I think you don't need custom IPageStore too. It will be redundant. When a request comes Wicket tries to load the page from the HTTP session first. If it is found there then it stores it at the end of the request cycle both in the http session and in the disk (IPageStore). Since you will have a bigger http session (ElastiCache) then I think there is no need to copy the same data second time with a custom IPageStore impl. I don't remember how all this works in 1.4.x, so what I say is for 1.5.0+. This part of Wicket (IPageStore, IDataStore) has been reworked for 1.5.0 but I guess there are no big architectural changes, just implementation changes. Please let us know how things go! Good luck! Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Tue, Mar 10, 2015 at 11:26 AM, Daniel Del Castillo dani...@optimad.com wrote: Hi Martin, Thanks a lot for your prompt response, that's very helpful. With regards the session affinity, we'll have a Tomcat Session Manager, which is going to serialise sessions into ElastiCache, configured for each Tomcat instance with the same parameters and this should free us from sticky sessions. Is there any other concerns that I should take into account with regards Wicket Sessions in an environment like this? Regards, DDC -Original Message- From: Martin Grigorov [mailto:mgrigo...@apache.org] Sent: 09 March 2015 21:26 To: users@wicket.apache.org Subject: Re: How to load-balance on AWS with standalone Tomcats Hi, I think it would be much simpler if you use Tomcat clustering support. Wicket 1.4.x is a bit old but as far as I remember the support for it in Wicket has been introduced with 1.4.1 so it should work fine in 1.4.17. But if Tomcat clustering in not an option for you for some reason then: - make sure you use session affinity (aka sticky sessions) - create your own IPageStore to keep the serialized view of the pages in shared DB (as you already figured out) - no need of custom ISessionStore. You need custom one only in case you want to put your Wicket Session instances in something else than HTTP Session I guess you are not interested in upgrading to Wicket 6.x but I'd recommend you to upgrade at least to 1.4.22. There were some security fixes in the last few releases from 1.4.x series. Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Mon, Mar 9, 2015 at 6:09 PM, Daniel Del Castillo dani...@optimad.com wrote: Hi list, One of the modules of our application is completely written in Wicket 1.4.17. This application runs on a single standalone Tomcat installation. We now need to move this to AWS servers and ensure the service is 24/7 available. We are looking to have multiple Tomcat instances (not a cluster) which are load-balanced with ELB. My question is: what do I we need to do in order to achieve this? I now we'll have to write a IPageStore in order to serialise the page map into a shared database. Any suggestion on how to do this? Will we have to write a ISessionStore as well? I've found a solution for clustering (see link below) which I'm now about to test but I've thought that it'd be useful to try get some advice from this list. http://letsgetdugg.com/2010/02/07/clustering-wicket-for-fun-and-prof it / Many thanks for your help. Regards, Daniel DDC -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. -- - -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by
How to load-balance on AWS with standalone Tomcats
Hi list, One of the modules of our application is completely written in Wicket 1.4.17. This application runs on a single standalone Tomcat installation. We now need to move this to AWS servers and ensure the service is 24/7 available. We are looking to have multiple Tomcat instances (not a cluster) which are load-balanced with ELB. My question is: what do I we need to do in order to achieve this? I now we'll have to write a IPageStore in order to serialise the page map into a shared database. Any suggestion on how to do this? Will we have to write a ISessionStore as well? I've found a solution for clustering (see link below) which I'm now about to test but I've thought that it'd be useful to try get some advice from this list. http://letsgetdugg.com/2010/02/07/clustering-wicket-for-fun-and-profit/ Many thanks for your help. Regards, Daniel DDC -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. ---
Re: How to load-balance on AWS with standalone Tomcats
Hi, I think it would be much simpler if you use Tomcat clustering support. Wicket 1.4.x is a bit old but as far as I remember the support for it in Wicket has been introduced with 1.4.1 so it should work fine in 1.4.17. But if Tomcat clustering in not an option for you for some reason then: - make sure you use session affinity (aka sticky sessions) - create your own IPageStore to keep the serialized view of the pages in shared DB (as you already figured out) - no need of custom ISessionStore. You need custom one only in case you want to put your Wicket Session instances in something else than HTTP Session I guess you are not interested in upgrading to Wicket 6.x but I'd recommend you to upgrade at least to 1.4.22. There were some security fixes in the last few releases from 1.4.x series. Martin Grigorov Funemployed! Available for hire! Wicket Training and Consulting https://twitter.com/mtgrigorov On Mon, Mar 9, 2015 at 6:09 PM, Daniel Del Castillo dani...@optimad.com wrote: Hi list, One of the modules of our application is completely written in Wicket 1.4.17. This application runs on a single standalone Tomcat installation. We now need to move this to AWS servers and ensure the service is 24/7 available. We are looking to have multiple Tomcat instances (not a cluster) which are load-balanced with ELB. My question is: what do I we need to do in order to achieve this? I now we'll have to write a IPageStore in order to serialise the page map into a shared database. Any suggestion on how to do this? Will we have to write a ISessionStore as well? I've found a solution for clustering (see link below) which I'm now about to test but I've thought that it'd be useful to try get some advice from this list. http://letsgetdugg.com/2010/02/07/clustering-wicket-for-fun-and-profit/ Many thanks for your help. Regards, Daniel DDC -- This transmission is confidential and intended solely for the person or organization to whom it is addressed. It may contain privileged and confidential information. If you are not the intended recipient, you should not copy, distribute or take any action in reliance on it. If you believe you received this transmission in error, please notify the sender as soon as possible. This e-mail has been scanned for known viruses by Mimecast for IMD. ---
