Hi Prabath, On Wed, Jul 8, 2015 at 8:24 AM, Prabath Ariyarathna <[email protected]> wrote:
> Hi Malaka. > > Agreed on your thought. Then we need to store all the rollback messages > and process separately by different thread same as message processor doing. > It will change the behavior of store mediator if rollback has happened. > Where are we going to store it ? Is it in an in-memory queue ? > > > Thanks. > > On Wed, Jul 8, 2015 at 10:31 AM, Malaka Silva <[email protected]> wrote: > >> Hi Prabath, >> >> I don't think it's a good idea since it can cause threads to be blocked >> when the broker is down? >> >> On Wed, Jul 8, 2015 at 10:25 AM, Prabath Ariyarathna <[email protected]> >> wrote: >> >>> Hi Shafreen. >>> >>> We planned to use same thread for the retry since store mediator working >>> in synchronous mode. >>> >>> >>> Thanks. >>> >>> On Wed, Jul 8, 2015 at 9:19 AM, Shafreen Anfar <[email protected]> >>> wrote: >>> >>>> Hi Prabath, >>>> >>>> >>>> On Tue, Jul 7, 2015 at 6:21 PM, Prabath Ariyarathna <[email protected] >>>> > wrote: >>>> >>>>> Hi All, >>>>> >>>>> We are planning to implement guaranteed message delivery capability to >>>>> the MSMP. We can divided current implementation into two basic sections >>>>> based on process. >>>>> >>>>> 1. *Message Store:* Message store mainly responsible for producing >>>>> messages to the message broker using message store mediator. >>>>> 2. *Message process*: Message processor picks the messages from >>>>> the message store and send to the specified endpoint. >>>>> >>>>> When we implement a guaranteed message delivery mechanism to the MSMP, >>>>> we need to think about both of above scenarios. JMS specification provided >>>>> us to two mechanisms(Acknowledgement, Transaction), which can be used >>>>> to achieve guaranteed delivery. >>>>> In our case message processor(consumer) side guaranteed delivery was >>>>> already implemented using acknowledgements. Message processor ACK to the >>>>> message store only if message was successfully processed. Message >>>>> store removes the message once ACK received by the processor else >>>>> redeliver the message, but for the message storing(producer) part, we >>>>> don’t >>>>> have any mechanism implemented to achieve this feature. Main >>>>> intention of this implementation is to provide a way to handle guaranteed >>>>> delivery for the message storing(producer) part. >>>>> >>>>> *Problem.* >>>>> We don’t have mechanism to handle guaranteed delivery in message >>>>> storing(producer) section. This issue can be occurred for following use >>>>> cases. >>>>> >>>>> 1. Message was sent to the MB, but didn’t received to the MB side >>>>> due to communication failure. >>>>> 2. Message broker not available when try to store the message. >>>>> >>>>> >>>>> *Solution.* >>>>> We can choose either acknowledgement or transaction as a solution of >>>>> guaranteed delivery implementation but since JMS 1.1 doesn't support for >>>>> the producer acknowledgement, we decided to enable transaction support for >>>>> the message storing section to provide guaranteed delivery. Other than the >>>>> transactions enable in the message storing process, we planned to add >>>>> retry >>>>> mechanism to avoid scenario like message store is not available when we >>>>> try >>>>> to produce messages. User can define retry count and retry delay in the >>>>> configuration of the store mediator. Message retry process is executing If >>>>> message broker connection not available or transaction has already >>>>> rollbacked. In addition to that features we are planning to add batch >>>>> process facility to store mediator to improve performance, while enabling >>>>> transactions as the future improvement. >>>>> >>>> >>>> How do you really going to implement the retry feature ? Will the retry >>>> happen using the same thread or will you be creating a separate thread for >>>> it ? >>>> >>>> >>>>> >>>>> >>>>> Thanks >>>>> -- >>>>> >>>>> *Prabath Ariyarathna* >>>>> >>>>> *Associate Technical Lead* >>>>> >>>>> *WSO2, Inc. * >>>>> >>>>> *lean . enterprise . middleware * >>>>> >>>>> >>>>> *Email: [email protected] <[email protected]>* >>>>> >>>>> *Blog: http://prabu-lk.blogspot.com <http://prabu-lk.blogspot.com>* >>>>> >>>>> *Flicker : https://www.flickr.com/photos/47759189@N08 >>>>> <https://www.flickr.com/photos/47759189@N08>* >>>>> >>>>> *Mobile: +94 77 699 4730 * >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> Regards, >>>> *Shafreen* >>>> Software Engineer >>>> WSO2 Inc >>>> Mobile : 077-556-395-1 >>>> >>> >>> >>> >>> -- >>> >>> *Prabath Ariyarathna* >>> >>> *Associate Technical Lead* >>> >>> *WSO2, Inc. * >>> >>> *lean . enterprise . middleware * >>> >>> >>> *Email: [email protected] <[email protected]>* >>> >>> *Blog: http://prabu-lk.blogspot.com <http://prabu-lk.blogspot.com>* >>> >>> *Flicker : https://www.flickr.com/photos/47759189@N08 >>> <https://www.flickr.com/photos/47759189@N08>* >>> >>> *Mobile: +94 77 699 4730 * >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Architecture mailing list >>> [email protected] >>> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >>> >>> >> >> >> -- >> >> Best Regards, >> >> Malaka Silva >> Senior Tech Lead >> M: +94 777 219 791 >> Tel : 94 11 214 5345 >> Fax :94 11 2145300 >> Skype : malaka.sampath.silva >> LinkedIn : http://www.linkedin.com/pub/malaka-silva/6/33/77 >> Blog : http://mrmalakasilva.blogspot.com/ >> >> WSO2, Inc. >> lean . enterprise . middleware >> http://www.wso2.com/ >> http://www.wso2.com/about/team/malaka-silva/ >> <http://wso2.com/about/team/malaka-silva/> >> >> Save a tree -Conserve nature & Save the world for your future. Print this >> email only if it is absolutely necessary. >> >> _______________________________________________ >> Architecture mailing list >> [email protected] >> https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture >> >> > > > -- > > *Prabath Ariyarathna* > > *Associate Technical Lead* > > *WSO2, Inc. * > > *lean . enterprise . middleware * > > > *Email: [email protected] <[email protected]>* > > *Blog: http://prabu-lk.blogspot.com <http://prabu-lk.blogspot.com>* > > *Flicker : https://www.flickr.com/photos/47759189@N08 > <https://www.flickr.com/photos/47759189@N08>* > > *Mobile: +94 77 699 4730 * > > > > > > > _______________________________________________ > Architecture mailing list > [email protected] > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- Regards, *Shafreen* Software Engineer WSO2 Inc Mobile : 077-556-395-1
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