Hi Azeez, On Fri, Aug 23, 2013 at 6:20 PM, Afkham Azeez <az...@wso2.com> wrote:
> As they have mentioned, when the network partitioning happens, the system > will work as two separate clusters. So we will get the situation where > there are two coordinators, assigning task to the members in their > respective clusters. We would need the tasks themselves to ensure that no > two instances run at the same time if their activities are not idempotent. > Yep, that seems to be the case. Will be updating the docs with this recommendations. Cheers, Anjana. > > Azeez > > > On Fri, Aug 23, 2013 at 6:17 PM, Afkham Azeez <az...@wso2.com> wrote: > >> Documentation on Hazelcast & split brain situations: >> http://www.hazelcast.com/docs/1.9.4/manual/multi_html/ch11s05.html >> >> >> On Fri, Aug 23, 2013 at 6:01 PM, Anjana Fernando <anj...@wso2.com> wrote: >> >>> Hi, >>> >>> The code review participants: Azeez, Anjana, PrabathA, Gihan, Inosh, >>> Malith, Chanika, Maninda, Dunith. >>> >>> * The "ClusteredTaskManagerFactory", should simply throw a >>> RuntimeException (IllegalStateException). >>> * Hazelcast can lead to a split brain scenario, where the leader >>> election procedure can result in two leaders in the system. The docs has to >>> contain a mention about this unlikely situation where, the same task can be >>> scheduled twice in two different nodes, and the logic inside the task needs >>> to detect this situation. Or else, if the operation done inside the task is >>> anyway idempotent, it is OK. >>> >>> Cheers, >>> Anjana. >>> >>> >>> On Fri, Aug 23, 2013 at 2:41 PM, Anjana Fernando <anj...@wso2.com>wrote: >>> >>>> more details >>>> »<https://www.google.com/calendar/event?action=VIEW&eid=OGFrcGU3b292bmJmOXZqYmgwdWszMWV1c2cgZGV2QHdzbzIub3Jn&tok=MTUjYW5qYW5hQHdzbzIuY29tYjdlNGNkMWFiOGNmMDAxZWIwZWM2YzE5ZWQ3MTY5OGRiZTUzNWE2YQ&ctz=Asia/Colombo&hl=en> >>>> Code Review - NTask Hazelcast Integration >>>> *When* >>>> ********Fri Aug 23, 2013 4:30pm – 5pm Colombo >>>> *Where* >>>> #20, 1'st Floor, Conf Room >>>> (map<http://maps.google.lk/maps?q=%2320,+1'st+Floor,+Conf+Room&hl=en> >>>> ) >>>> *Calendar* >>>> anj...@wso2.com >>>> *Who* >>>> • >>>> anj...@wso2.com - organizer >>>> • >>>> Malith Dhanushka >>>> • >>>> Prabath Abeysekera >>>> • >>>> Afkham Azeez >>>> • >>>> Dunith Dhanushka >>>> • >>>> Maninda Edirisooriya >>>> • >>>> Chanika Geeganage >>>> • >>>> Gihan Anuruddha >>>> • >>>> dev@wso2.org >>>> • >>>> Inosh Goonewardena >>>> • >>>> Ayashkantha Ramasinghe >>>> >>>> Going? >>>> ***Yes<https://www.google.com/calendar/event?action=RESPOND&eid=OGFrcGU3b292bmJmOXZqYmgwdWszMWV1c2cgZGV2QHdzbzIub3Jn&rst=1&tok=MTUjYW5qYW5hQHdzbzIuY29tYjdlNGNkMWFiOGNmMDAxZWIwZWM2YzE5ZWQ3MTY5OGRiZTUzNWE2YQ&ctz=Asia/Colombo&hl=en>- >>>> Maybe<https://www.google.com/calendar/event?action=RESPOND&eid=OGFrcGU3b292bmJmOXZqYmgwdWszMWV1c2cgZGV2QHdzbzIub3Jn&rst=3&tok=MTUjYW5qYW5hQHdzbzIuY29tYjdlNGNkMWFiOGNmMDAxZWIwZWM2YzE5ZWQ3MTY5OGRiZTUzNWE2YQ&ctz=Asia/Colombo&hl=en>- >>>> No<https://www.google.com/calendar/event?action=RESPOND&eid=OGFrcGU3b292bmJmOXZqYmgwdWszMWV1c2cgZGV2QHdzbzIub3Jn&rst=2&tok=MTUjYW5qYW5hQHdzbzIuY29tYjdlNGNkMWFiOGNmMDAxZWIwZWM2YzE5ZWQ3MTY5OGRiZTUzNWE2YQ&ctz=Asia/Colombo&hl=en> >>>> * **more options >>>> »<https://www.google.com/calendar/event?action=VIEW&eid=OGFrcGU3b292bmJmOXZqYmgwdWszMWV1c2cgZGV2QHdzbzIub3Jn&tok=MTUjYW5qYW5hQHdzbzIuY29tYjdlNGNkMWFiOGNmMDAxZWIwZWM2YzE5ZWQ3MTY5OGRiZTUzNWE2YQ&ctz=Asia/Colombo&hl=en> >>>> >>>> Invitation from Google Calendar <https://www.google.com/calendar/> >>>> >>>> You are receiving this courtesy email at the account dev@wso2.orgbecause >>>> you are an attendee of this event. >>>> >>>> To stop receiving future notifications for this event, decline this >>>> event. Alternatively you can sign up for a Google account at >>>> https://www.google.com/calendar/ and control your notification >>>> settings for your entire calendar. >>>> >>>> _______________________________________________ >>>> Dev mailing list >>>> Dev@wso2.org >>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>> >>>> >>> >>> >>> -- >>> *Anjana Fernando* >>> Technical Lead >>> WSO2 Inc. | http://wso2.com >>> lean . enterprise . middleware >>> >> >> >> >> -- >> *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 >> 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* >> * >> * >> *Lean . Enterprise . Middleware* >> > > > > -- > *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 > 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* > * > * > *Lean . Enterprise . Middleware* > -- *Anjana Fernando* Technical Lead WSO2 Inc. | http://wso2.com lean . enterprise . middleware
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