Re: Is it possible to replace the HttpSession implementation in Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Tsirkin, On 2/24/2010 2:21 AM, Tsirkin Evgeny wrote: On Tue, Feb 23, 2010 at 11:50 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- What's flow-resuming is ?How a request can be resumed ?Doesn't this goes againt the idea of http is staitless ,that's vrey interesting? So,the flow-resuming you were talking about is just the mechanism of storing the request parameters and url and use them again after successful authentication,right? It also stores POST message bodies up to a certain size. Yes,this probably would not work with custom session ,since tomcat probably stores the parameters and url in session. Tomcat definitely does, under the session note, which is a Tomcat-specific implementation detail. For this particular issue however i have implemented my own mechanism using custom cookies (server side cookies). Server-side cookies? Sounds like a winner. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuFRPIACgkQ9CaO5/Lv0PBRhgCgwCBL4uSvYBN2epjoLJormtWH YOMAoL47gA31p86jAYmvklsoCb9mQfGe =bL2J -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
Hi Evgeny, thanks a lot for shared your experience, very interesting. I'd like to plug something magic that could avoid me configuring a filter, I started investigating about a possible use of AOP HttpSession. If anyone is interested, I'll share my results when done. Best regards!!! Simo http://people.apache.org/~simonetripodi/ On Tue, Feb 23, 2010 at 7:51 AM, Tsirkin Evgeny tsir...@gmail.com wrote: Just in case somebody will google for a solution for replacing session. I have done this . First of all ,why: We have cluster of 2 machines . Each have a separate db on it . The machines are sharing information using nfs mounting fs. Each machine runs it's own apache server ,(no apache balancer in front). There IS a hardware load balancer in front of this but sometime it fails to route already open sessions to same host. So,we can't : 1. share sessions using files ,because this would be same file for 2 tomcats and because this would fail on nfs . 2. we can't use tomcat cluster because there are cases when BOTH tomcat would be shut down or restarted and session would be loosed. 3. we can't use a db because there is no central db - each host has it's own one. 4. to complicate issue machines could be added/removed to the cluster. What we did - override session object using filter.On each request start it would read it's info from db (any configured one ,but preferring the local one) On each request end it would write itself into ALL dbs that are configured to be used. Although the obvious problem here is the writing to more then 1 db and reading from a db on each request ,this really works good thanks for mysql to be so fast on simple read/write. I have even implemented a simple lock mechanism for session . What more - this solution is portable ,it worked for us on SunONE server and now on tomcat. Thanks Evgeny On Tue, Feb 16, 2010 at 9:54 PM, Simone Tripodi simone.trip...@gmail.comwrote: Hi Martin, very interesting, thanks for share it!!! I did, more or less, the same on a project for a customer, but it was strictly related to the application, your stuff looks much much better of mine and it is a reusable module. All the best, Simo http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ On Tue, Feb 16, 2010 at 6:02 PM, Martin Grotzke martin.grot...@javakaffee.de wrote: Hi Jon, On Mon, 2010-02-15 at 11:55 -0600, Jon Brisbin wrote: I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? You might have a look at the http://code.google.com/p/memcached-session-manager/ which is a session failover solution storing sessions in memcached. When the project was created I only thought of applications using sticky sessions but it should also work with non-sticky sessions if sessions are stored in memcached synchronously (sessionBackupAsync needs to be set to false, see [1]). The memcached-session-manager basically is a session manager implemention, the most interesting part is the MemcachedBackupSessionManager ([2]) if you want to have a look at the code. Cheers, Martin [1] http://code.google.com/p/memcached-session-manager/wiki/SetupAndConfiguration [2] http://github.com/magro/memcached-session-manager/blob/master/core/src/main/java/de/javakaffee/web/msm/MemcachedBackupSessionManager.java Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ - 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:
Re: Is it possible to replace the HttpSession implementation in Tomcat?
On Feb 23, 2010, at 7:31 AM, Simone Tripodi wrote: Hi Evgeny, thanks a lot for shared your experience, very interesting. I'd like to plug something magic that could avoid me configuring a filter, I started investigating about a possible use of AOP HttpSession. If anyone is interested, I'll share my results when done. This sound very interesting to me. I'd love to take a look at it when you're done. I'm still fighting load-balancing issues. Jon Brisbin Portal Webmaster NPC International, Inc. Best regards!!! Simo http://people.apache.org/~simonetripodi/ On Tue, Feb 23, 2010 at 7:51 AM, Tsirkin Evgeny tsir...@gmail.com wrote: Just in case somebody will google for a solution for replacing session. I have done this . First of all ,why: We have cluster of 2 machines . Each have a separate db on it . The machines are sharing information using nfs mounting fs. Each machine runs it's own apache server ,(no apache balancer in front). There IS a hardware load balancer in front of this but sometime it fails to route already open sessions to same host. So,we can't : 1. share sessions using files ,because this would be same file for 2 tomcats and because this would fail on nfs . 2. we can't use tomcat cluster because there are cases when BOTH tomcat would be shut down or restarted and session would be loosed. 3. we can't use a db because there is no central db - each host has it's own one. 4. to complicate issue machines could be added/removed to the cluster. What we did - override session object using filter.On each request start it would read it's info from db (any configured one ,but preferring the local one) On each request end it would write itself into ALL dbs that are configured to be used. Although the obvious problem here is the writing to more then 1 db and reading from a db on each request ,this really works good thanks for mysql to be so fast on simple read/write. I have even implemented a simple lock mechanism for session . What more - this solution is portable ,it worked for us on SunONE server and now on tomcat. Thanks Evgeny On Tue, Feb 16, 2010 at 9:54 PM, Simone Tripodi simone.trip...@gmail.comwrote: Hi Martin, very interesting, thanks for share it!!! I did, more or less, the same on a project for a customer, but it was strictly related to the application, your stuff looks much much better of mine and it is a reusable module. All the best, Simo http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ On Tue, Feb 16, 2010 at 6:02 PM, Martin Grotzke martin.grot...@javakaffee.de wrote: Hi Jon, On Mon, 2010-02-15 at 11:55 -0600, Jon Brisbin wrote: I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? You might have a look at the http://code.google.com/p/memcached-session-manager/ which is a session failover solution storing sessions in memcached. When the project was created I only thought of applications using sticky sessions but it should also work with non-sticky sessions if sessions are stored in memcached synchronously (sessionBackupAsync needs to be set to false, see [1]). The memcached-session-manager basically is a session manager implemention, the most interesting part is the MemcachedBackupSessionManager ([2]) if you want to have a look at the code. Cheers, Martin [1] http://code.google.com/p/memcached-session-manager/wiki/SetupAndConfiguration [2] http://github.com/magro/memcached-session-manager/blob/master/core/src/main/java/de/javakaffee/web/msm/MemcachedBackupSessionManager.java Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Tsirkin, On 2/23/2010 1:51 AM, Tsirkin Evgeny wrote: What we did - override session object using filter.On each request start it would read it's info from db (any configured one ,but preferring the local one) On each request end it would write itself into ALL dbs that are configured to be used. This could have been done using standard Tomcat components and a shared session-only database. Or, a pair of MysQL databases rigged to hot-copy each other. I think you did more work than necessary. Does this work with authentication? Tomcat adds information to the session that isn't part of the attributes, so a standard HttpSession wrapper won't be able to replicate this information between the nodes. That means that things like flow-resuming (where your original request is re-submitted after successful authentication) won't work. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuEGbYACgkQ9CaO5/Lv0PDhiQCfQe3yPvORu/NX4AKyTDFL+xvR kxgAoKAdaB26k5K/T+10Rqrq7iQsS6Xu =2IqQ -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
On Tue, Feb 23, 2010 at 8:08 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Tsirkin, On 2/23/2010 1:51 AM, Tsirkin Evgeny wrote: What we did - override session object using filter.On each request start it would read it's info from db (any configured one ,but preferring the local one) On each request end it would write itself into ALL dbs that are configured to be used. This could have been done using standard Tomcat components and a shared session-only database. Which means running another mysql instance just for it, And on what machine - there are 2 equivalent machines ,no separate db one. Or, a pair of MysQL databases rigged to hot-copy each other. Unfortunately i think that mysql just don't know how to do master-master cluster (maybe in newer versions it does). I think you did more work than necessary. Does this work with authentication? Tomcat adds information to the session that isn't part of the attributes, so a standard HttpSession wrapper won't be able to replicate this information between the nodes. I guess tomcat authentication is broken for me - tomcat is probably writing something in session _ before _ the filter loads the data into it from db. This probably can be fixed if i do not rip the old data written by tomcat and just add my own ,but i just don't use tomcat auth. That means that things like flow-resuming (where your original request is re-submitted after successful authentication) won't work. What's flow-resuming is ?How a request can be resumed ?Doesn't this goes againt the idea of http is staitless ,that's vrey interesting? Evgeny - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuEGbYACgkQ9CaO5/Lv0PDhiQCfQe3yPvORu/NX4AKyTDFL+xvR kxgAoKAdaB26k5K/T+10Rqrq7iQsS6Xu =2IqQ -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Tsirkin, On 2/23/2010 1:49 PM, Tsirkin Evgeny wrote: On Tue, Feb 23, 2010 at 8:08 PM, Christopher Schultz ch...@christopherschultz.net wrote: I guess tomcat authentication is broken for me - tomcat is probably writing something in session _ before _ the filter loads the data into it from db. That is true: Tomcat does session work /before/ filters are invoked, but it also has something called the session note which is essentially a private attribute that can be used for things like authentication state information. The HttpSession has no access to this except through introspection, which could be disabled by a SecurityManager I'd imagine. This probably can be fixed if i do not rip the old data written by tomcat and just add my own ,but i just don't use tomcat auth. If you're not using container-based authentication, then I guess it doesn't matter. That means that things like flow-resuming (where your original request is re-submitted after successful authentication) won't work. What's flow-resuming is ?How a request can be resumed ?Doesn't this goes againt the idea of http is staitless ,that's vrey interesting? See section 12.5.3 of the servlet (2.5) specification which lays this all out in plain English. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuETaUACgkQ9CaO5/Lv0PDHggCeOrnsxbjOuB0THbM80BBmeJSe BEEAnRglqa3NXiGhX7+2IoFIWbotMCLl =4KTl -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
On Tue, Feb 23, 2010 at 11:50 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- What's flow-resuming is ?How a request can be resumed ?Doesn't this goes againt the idea of http is staitless ,that's vrey interesting? So,the flow-resuming you were talking about is just the mechanism of storing the request parameters and url and use them again after successful authentication,right? Yes,this probably would not work with custom session ,since tomcat probably stores the parameters and url in session. For this particular issue however i have implemented my own mechanism using custom cookies (server side cookies). Of course,all this is probably can not be reused and is tied to my particular env. . But it is a yes this can be done if really needed email. Evgeny See section 12.5.3 of the servlet (2.5) specification which lays this all out in plain English. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuETaUACgkQ9CaO5/Lv0PDHggCeOrnsxbjOuB0THbM80BBmeJSe BEEAnRglqa3NXiGhX7+2IoFIWbotMCLl =4KTl -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
Just in case somebody will google for a solution for replacing session. I have done this . First of all ,why: We have cluster of 2 machines . Each have a separate db on it . The machines are sharing information using nfs mounting fs. Each machine runs it's own apache server ,(no apache balancer in front). There IS a hardware load balancer in front of this but sometime it fails to route already open sessions to same host. So,we can't : 1. share sessions using files ,because this would be same file for 2 tomcats and because this would fail on nfs . 2. we can't use tomcat cluster because there are cases when BOTH tomcat would be shut down or restarted and session would be loosed. 3. we can't use a db because there is no central db - each host has it's own one. 4. to complicate issue machines could be added/removed to the cluster. What we did - override session object using filter.On each request start it would read it's info from db (any configured one ,but preferring the local one) On each request end it would write itself into ALL dbs that are configured to be used. Although the obvious problem here is the writing to more then 1 db and reading from a db on each request ,this really works good thanks for mysql to be so fast on simple read/write. I have even implemented a simple lock mechanism for session . What more - this solution is portable ,it worked for us on SunONE server and now on tomcat. Thanks Evgeny On Tue, Feb 16, 2010 at 9:54 PM, Simone Tripodi simone.trip...@gmail.comwrote: Hi Martin, very interesting, thanks for share it!!! I did, more or less, the same on a project for a customer, but it was strictly related to the application, your stuff looks much much better of mine and it is a reusable module. All the best, Simo http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ On Tue, Feb 16, 2010 at 6:02 PM, Martin Grotzke martin.grot...@javakaffee.de wrote: Hi Jon, On Mon, 2010-02-15 at 11:55 -0600, Jon Brisbin wrote: I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? You might have a look at the http://code.google.com/p/memcached-session-manager/ which is a session failover solution storing sessions in memcached. When the project was created I only thought of applications using sticky sessions but it should also work with non-sticky sessions if sessions are stored in memcached synchronously (sessionBackupAsync needs to be set to false, see [1]). The memcached-session-manager basically is a session manager implemention, the most interesting part is the MemcachedBackupSessionManager ([2]) if you want to have a look at the code. Cheers, Martin [1] http://code.google.com/p/memcached-session-manager/wiki/SetupAndConfiguration [2] http://github.com/magro/memcached-session-manager/blob/master/core/src/main/java/de/javakaffee/web/msm/MemcachedBackupSessionManager.java Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/http://people.apache.org/%7Esimonetripodi/ - 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: Is it possible to replace the HttpSession implementation in Tomcat?
Hi Jon, On Mon, 2010-02-15 at 11:55 -0600, Jon Brisbin wrote: I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? You might have a look at the http://code.google.com/p/memcached-session-manager/ which is a session failover solution storing sessions in memcached. When the project was created I only thought of applications using sticky sessions but it should also work with non-sticky sessions if sessions are stored in memcached synchronously (sessionBackupAsync needs to be set to false, see [1]). The memcached-session-manager basically is a session manager implemention, the most interesting part is the MemcachedBackupSessionManager ([2]) if you want to have a look at the code. Cheers, Martin [1] http://code.google.com/p/memcached-session-manager/wiki/SetupAndConfiguration [2] http://github.com/magro/memcached-session-manager/blob/master/core/src/main/java/de/javakaffee/web/msm/MemcachedBackupSessionManager.java Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/ - 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 -- signature.asc Description: This is a digitally signed message part
Re: Is it possible to replace the HttpSession implementation in Tomcat?
Hi Martin, very interesting, thanks for share it!!! I did, more or less, the same on a project for a customer, but it was strictly related to the application, your stuff looks much much better of mine and it is a reusable module. All the best, Simo http://people.apache.org/~simonetripodi/ On Tue, Feb 16, 2010 at 6:02 PM, Martin Grotzke martin.grot...@javakaffee.de wrote: Hi Jon, On Mon, 2010-02-15 at 11:55 -0600, Jon Brisbin wrote: I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? You might have a look at the http://code.google.com/p/memcached-session-manager/ which is a session failover solution storing sessions in memcached. When the project was created I only thought of applications using sticky sessions but it should also work with non-sticky sessions if sessions are stored in memcached synchronously (sessionBackupAsync needs to be set to false, see [1]). The memcached-session-manager basically is a session manager implemention, the most interesting part is the MemcachedBackupSessionManager ([2]) if you want to have a look at the code. Cheers, Martin [1] http://code.google.com/p/memcached-session-manager/wiki/SetupAndConfiguration [2] http://github.com/magro/memcached-session-manager/blob/master/core/src/main/java/de/javakaffee/web/msm/MemcachedBackupSessionManager.java Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/ - 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
Is it possible to replace the HttpSession implementation in Tomcat?
Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/ - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Simone, On 2/15/2010 12:05 PM, Simone Tripodi wrote: I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Why not use the session replication that comes with Tomcat? Otherwise, presumably Hazelcast knows how to integrate their own product with Tomcat. You might have better luck asking them. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkt5f/AACgkQ9CaO5/Lv0PBs2ACgh/CsaG1mdvnENrcw5Zt8cn10 tPgAni7x4ZGDvBiT2+wIoPZ5QwuOBKNG =P+WC -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
I'm just getting ready to ask a question like this, as I have a similar need. I'm using the built-in Tribes-based replication which works fine for short periods of time and under moderate to light load. Once the Tomcat server has been running for a day or two, though, this distributed session replication starts breaking unexpectedly. Once this happens, the apps start becoming unavailable until I restart everything. I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? Jon Brisbin Portal Webmaster NPC International, Inc. On Feb 15, 2010, at 11:05 AM, Simone Tripodi wrote: Hi all guys and very nice to meet the Tomcat community, I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Thanks in advance, every suggestion will be very appreciated. Simo [1] http://www.hazelcast.com/ http://people.apache.org/~simonetripodi/ - 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: Is it possible to replace the HttpSession implementation in Tomcat?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Jon, On 2/15/2010 12:55 PM, Jon Brisbin wrote: I'm using the built-in Tribes-based replication which works fine for short periods of time and under moderate to light load. Once the Tomcat server has been running for a day or two, though, this distributed session replication starts breaking unexpectedly. Once this happens, the apps start becoming unavailable until I restart everything. That's unfortunate. You should post a complaint that you are observing this behavior. AFAIK, the Tomcat devs are quite satisfied with their replication implementation. Get ready to defend your use of session objects, though :) I'm trying to figure out today how I can implement a Valve or something that can store a session to a backend DB and reload that session on another Tomcat instance similar to how the PersistentManager loads user's session after a restart. Would a Valve based on PersistentValve allow me to implement a cluster-like solution such that a user login causes a write to a central database and a load balanced request to another server would see that user without forcing another login? I would think that simply using the existing PersistenceManager + JDBCStore would work. In tact, it's even documented to be one of the ways of achieving session clustering without doing in-memory replication: http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html Unfortunately, I didn't see any specifics on how to configure Tomcat to do just that, though I must admit I didn't spend very much time looking. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkt5khwACgkQ9CaO5/Lv0PCydwCdE/ZjGWYg91P+anDZIFYhilSz QVUAniRKuLV/TSUphnlBhEdKIKDGC2TM =+FuL -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to replace the HttpSession implementation in Tomcat?
Hi Cris, thanks for your reply and nice to meet you :) There's no specific reason why I don't want to use the built-in session replication, even if I'd be able to realize what I've in my mind, the sysadmins will never let me know to use it since they're confident with the Tomcat solution. BTW, I'm just curious and like very much integrating heterogeneous software layers in an original way, so before spending time in studying the Tomcat code and understand how to realize my crazy stuff I wrote the email :P Thanks, all the best, Simo http://people.apache.org/~simonetripodi/ On Mon, Feb 15, 2010 at 6:10 PM, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Simone, On 2/15/2010 12:05 PM, Simone Tripodi wrote: I've a web-application that needs to be replicated in more than one Tomcat, and since it is HttpSession based, I need to enable the session replication. Even if I work with very good sysadmins that know how to do it, I'm curious and would like to know if I could replace the HttpSession implementation with a my own one, I'd like to integrate Hazelcast[1] for data synchronization. Why not use the session replication that comes with Tomcat? Otherwise, presumably Hazelcast knows how to integrate their own product with Tomcat. You might have better luck asking them. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkt5f/AACgkQ9CaO5/Lv0PBs2ACgh/CsaG1mdvnENrcw5Zt8cn10 tPgAni7x4ZGDvBiT2+wIoPZ5QwuOBKNG =P+WC -END PGP SIGNATURE- - 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
