Is a Hazelcast cluster created per webapp, or is a single cluster shared across all webapps? Why did you drop the idea of using a SessionListener & SessionManager?
On Mon, Oct 13, 2014 at 7:57 PM, Pubudu Dissanayake <pubu...@wso2.com> wrote: > > Hi Azeez/Srinath > > I've managed to implement Tomcat Session replication using Hazelcast APIs. > As per the off-line chats with Azeez and Sameera,This functionality is > applicable to all web applications which are deploy in WSO2 AS. I've > introduced a global web filter, which is define in the web.xml in the > conf/ directory of Tomcat to have it included in all web applications > deployed. > As a result I've managed to replicate all the session attributes per web > application. Furthermore I've tested basic auth webapp which works as > expected. And I wrote a jmeter script to test session.setAttribute() by > inserting 100+ records. > > Please advice as to how should I thoroughly test this feature. > > -Pubudu > > > On Thu, Oct 2, 2014 at 11:40 AM, Afkham Azeez <az...@wso2.com> wrote: > >> >> >> On Thu, Oct 2, 2014 at 9:22 AM, Srinath Perera <srin...@wso2.com> wrote: >> >>> I am not sure from notes what we decided. >>> >>> Cannot we just used hazelcast session replication? does above design you >>> mentioned built on top of Hazelcast? >>> >> >> Yes, the plan is to use what Hazelcast provides. Otherwise, we will >> anyway have to solve all the problems the Hz implementation has solved. >> >> >>> >>> --Srinath >>> >>> On Wed, Oct 1, 2014 at 2:18 PM, Pubudu Dissanayake <pubu...@wso2.com> >>> wrote: >>> >>>> Hi All, >>>> >>>> Based on the Architecture review of " Tomcat session replication using >>>> caching ", following aspects were discussed. >>>> Participants >>>> >>>> - Azeez, Sameera , Aruna, Jayanga, Gayashan, SupunM, Niranjan and >>>> Myself >>>> >>>> Proposed solution. - key-val: (CarbonSessionCacheKey, Carbon >>>> SessionCache) >>>> >>>> - Initial implementation was based on javax.caching api's. I've >>>> created CarbonSessionCache and CarbonSessionCacheKey to maintain >>>> HttpSession in the Hazelcast distributed map. Session will be >>>> intercepted by using a Tomcat Valve. >>>> - *Verdict* on the proposed solution. - Cache map Serialization and >>>> Deserialization is very expensive operation due to heavy traffic. >>>> Therefore >>>> it is not efficient to replicate the whole session object in the cache >>>> map. >>>> >>>> Counter Proposed solution >>>> >>>> - Having a Hazelcast map per session object. In that way if an >>>> attribute in the session changes the whole entry should not have to be >>>> replicated, only the changed attribute. >>>> - Have a per-session cache - ( session_id ). >>>> - Issue in this approach as follows >>>> - How can we acquire the session object from the map ? >>>> >>>> *Final verdict *on the feature implementation >>>> >>>> - Instead of using the caching APIs, This needs to fix in >>>> Hazelcast level and do it in the optimal way. [1] >>>> - HazelcastWM >>>> <http://docs.hazelcast.org/docs/1.9.4/manual/html/ch08.html> [2], >>>> Bring in the filter code level in to the tomcat valve instead >>>> >>>> -Pubudu >>>> [1] http://hazelcast.com/use-cases/web-session-clustering/ >>>> [2] http://docs.hazelcast.org/docs/1.9.4/manual/html/ch08.html >>>> >>>> On Wed, Oct 1, 2014 at 10:51 AM, Pubudu Dissanayake <pubu...@wso2.com> >>>> wrote: >>>> >>>>> Hi Srinath >>>>> >>>>> Hazelcast WM allows us to cluster user http sessions automatically. >>>>> Followings are required for enabling Hazelcast Session Clustering >>>>> <http://hazelcast.com/use-cases/web-session-clustering/> [2][3] >>>>> >>>>> - Target application or web server should support Java 1.5+ >>>>> - Target application or web server should support Servlet 2.4+ spec >>>>> - Session objects that needs to be clustered have to be >>>>> Serializable >>>>> >>>>> Purpose of web session clustering is to replicate web session state >>>>> across a distributed application servers. Benefits, allow us to scale out >>>>> but also avoid any single point of failure and allow us to dynamically >>>>> handle node failure within the application tier. performance of this >>>>> web session clustering is high according to VP Hazelcast >>>>> <https://www.youtube.com/watch?v=8a0LrlOIXq0>. Using Hazelcast >>>>> session replication can be achieved in two different ways. Observations as >>>>> follows. >>>>> >>>>> - *Hazelcast Enterprise* has native web session clustering build >>>>> in to Apache Tomcat. >>>>> - *Opensource Hazelcast* has provide a web session clustering as >>>>> an external filter, basically Hazelcast filter has to be placed before >>>>> all >>>>> of other filters and that will enable us to provide the web session >>>>> clustering in opensource. In this use case it doesn't required changes >>>>> to >>>>> application itself. >>>>> >>>>> [1] https://redmine.wso2.com/issues/2816 >>>>> [2] http://hazelcast.com/use-cases/web-session-clustering/ >>>>> [3] >>>>> http://hazelcast.org/docs/latest/manual/html/httpsessionclustering.html >>>>> [4] https://www.youtube.com/watch?v=8a0LrlOIXq0 >>>>> >>>>> More info $subject - Web Session Clustering / Session Replication >>>>> using Hazelcast >>>>> >>>>> -Pubudu >>>>> >>>>> >>>>> On Wed, Oct 1, 2014 at 10:41 AM, Srinath Perera <srin...@wso2.com> >>>>> wrote: >>>>> >>>>>> We need to use Hazelcast >>>>>> >>>>>> When implemented we need to test this with multilple nodes (at least >>>>>> 4) and in high load conditions before it is done done. >>>>>> >>>>>> --Srinath >>>>>> >>>>>> On Wed, Oct 1, 2014 at 8:52 AM, Dinesh J Weerakkody <dine...@wso2.com >>>>>> > wrote: >>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I came across this project [1] and might be useful. It is based on >>>>>>> memcached library. >>>>>>> >>>>>>> [1] http://code.google.com/p/memcached-session-manager/ >>>>>>> >>>>>>> On Tue, Sep 30, 2014 at 8:01 PM, Pubudu Dissanayake < >>>>>>> pubu...@wso2.com> wrote: >>>>>>> >>>>>>>> Hi All, >>>>>>>> >>>>>>>> I am working on an improvement for Carbon to enable tomcat session >>>>>>>> replication support using caching .Our previous implementation was >>>>>>>> based on a Tomcat Valve ( >>>>>>>> CarbonTomcatSessionReplicationValve.java).And it was used to >>>>>>>> replicate the session and adding it to cluster message. >>>>>>>> >>>>>>>> Http Session replication in carbon works like this (its quite >>>>>>>> similar to how the same work in a standalone tomcat). >>>>>>>> >>>>>>>> 1. Not every webbapp session will be replicated. You need to set a >>>>>>>> context property (distributable) for the webapp you need. >>>>>>>> 2. Once enabled, and when the session is modified on a node, that >>>>>>>> modification is sent to other nodes via a cluster message ( using >>>>>>>> clustering ) >>>>>>>> >>>>>>>> For the new implementation, initial suggestion is to use our >>>>>>>> caching implementation. So we need to store the session object in the >>>>>>>> cache >>>>>>>> and when session is modified, then we need to update the cache. >>>>>>>> >>>>>>>> Please guide me through the process what should I carried out and >>>>>>>> any references to help me further to achieve [1]. >>>>>>>> >>>>>>>> [1] https://redmine.wso2.com/issues/2816 >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> *Pubudu Dissanayake* >>>>>>>> Software Engineer >>>>>>>> >>>>>>>> WSO2 Inc.; http://wso2.com >>>>>>>> lean.enterprise.middleware >>>>>>>> Mob: + 94 775 503 304 >>>>>>>> >>>>>>>> Blog: http://geekdetected.wordpress.com/ >>>>>>>> Linkedin: *http://lk.linkedin.com/in/pubududissanayake* >>>>>>>> <http://lk.linkedin.com/in/pubududissanayake> >>>>>>>> Flickr : https://www.flickr.com/photos/pubudufx/ >>>>>>>> Twitter: https://twitter.com/GeekInAction >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Dev mailing list >>>>>>>> Dev@wso2.org >>>>>>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> >>>>>>> *Dinesh J. Weerakkody* >>>>>>> Software Engineer >>>>>>> WSO2 Inc. >>>>>>> lean | enterprise | middleware >>>>>>> M : +94 727 361788 | E : dine...@wso2.com | W : www.wso2.com >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Dev mailing list >>>>>>> Dev@wso2.org >>>>>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> ============================ >>>>>> Srinath Perera, Ph.D. >>>>>> http://people.apache.org/~hemapani/ >>>>>> http://srinathsview.blogspot.com/ >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> *Pubudu Dissanayake* >>>>> Software Engineer >>>>> >>>>> WSO2 Inc.; http://wso2.com >>>>> lean.enterprise.middleware >>>>> Mob: + 94 775 503 304 >>>>> >>>>> Blog: http://geekdetected.wordpress.com/ >>>>> Linkedin: *http://lk.linkedin.com/in/pubududissanayake* >>>>> <http://lk.linkedin.com/in/pubududissanayake> >>>>> Flickr : https://www.flickr.com/photos/pubudufx/ >>>>> Twitter: https://twitter.com/GeekInAction >>>>> >>>>> >>>> >>>> >>>> -- >>>> *Pubudu Dissanayake* >>>> Software Engineer >>>> >>>> WSO2 Inc.; http://wso2.com >>>> lean.enterprise.middleware >>>> Mob: + 94 775 503 304 >>>> >>>> Blog: http://geekdetected.wordpress.com/ >>>> Linkedin: *http://lk.linkedin.com/in/pubududissanayake* >>>> <http://lk.linkedin.com/in/pubududissanayake> >>>> Flickr : https://www.flickr.com/photos/pubudufx/ >>>> Twitter: https://twitter.com/GeekInAction >>>> >>>> >>> >>> >>> -- >>> ============================ >>> Blog: http://srinathsview.blogspot.com twitter:@srinath_perera >>> Site: http://people.apache.org/~hemapani/ >>> Photos: http://www.flickr.com/photos/hemapani/ >>> Phone: 0772360902 >>> >> >> >> >> -- >> *Afkham Azeez* >> Director of Architecture; WSO2, Inc.; http://wso2.com >> Member; Apache Software Foundation; http://www.apache.org/ >> * <http://www.apache.org/>* >> *email: **az...@wso2.com* <az...@wso2.com> >> * cell: +94 77 3320919 <%2B94%2077%203320919>blog: * >> *http://blog.afkham.org* <http://blog.afkham.org> >> *twitter: **http://twitter.com/afkham_azeez* >> <http://twitter.com/afkham_azeez> >> *linked-in: **http://lk.linkedin.com/in/afkhamazeez >> <http://lk.linkedin.com/in/afkhamazeez>* >> >> *Lean . Enterprise . Middleware* >> > > > > -- > *Pubudu Dissanayake* > Software Engineer > > WSO2 Inc.; http://wso2.com > lean.enterprise.middleware > Mob: + 94 775 503 304 > > Blog: http://geekdetected.wordpress.com/ > Linkedin: *http://lk.linkedin.com/in/pubududissanayake* > <http://lk.linkedin.com/in/pubududissanayake> > Flickr : https://www.flickr.com/photos/pubudufx/ > Twitter: https://twitter.com/GeekInAction > > -- *Afkham Azeez* Director of Architecture; WSO2, Inc.; http://wso2.com Member; Apache Software Foundation; http://www.apache.org/ * <http://www.apache.org/>* *email: **az...@wso2.com* <az...@wso2.com> * cell: +94 77 3320919blog: **http://blog.afkham.org* <http://blog.afkham.org> *twitter: **http://twitter.com/afkham_azeez* <http://twitter.com/afkham_azeez> *linked-in: **http://lk.linkedin.com/in/afkhamazeez <http://lk.linkedin.com/in/afkhamazeez>* *Lean . Enterprise . Middleware*
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