Interesting..... Hibernate hooks inside a J2ee container or Spring which requires a specific OR mapping to a 20th century RDBMS. Storm works in a Linux distributed environment which does not need a RDBMS. RDBMS's do not work in a distributed environment.
Mason Yu Jr. CEO Big Data Architects, LLC. 著名的孫子 On Thu, May 14, 2015 at 9:58 AM, Stephen Powis <spo...@salesforce.com> wrote: > [image: Boxbe] <https://www.boxbe.com/overview> This message is eligible > for Automatic Cleanup! (spo...@salesforce.com) Add cleanup rule > <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3DuAW1cNLhRjzzoTybJZlWM4edzt3m9fQiQ%252Fotr%252BLEu3ac0GIlaQyl%252Be4UagkWlTiCY%252Bvq8KXOkzkzNY0pSkyJzvKKJyQv%252BXceuaA%252FuExYRw6YS1o2s1%252FImPAjQkHSXt%252FvWesPubbzFPmMWCDCtBIJEA%253D%253D%26key%3D%252BXRs6Dx5fQJ4FB57cniXG9YH1MKQnFQnIVYEqegbWGo%253D&tc_serial=21328751243&tc_rand=1774350433&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> > | More info > <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=21328751243&tc_rand=1774350433&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> > > Hello everyone! > > I'm currently toying around with a prototype built ontop of Storm and have > been running into some not so easy going while trying to work with > Hibernate and storm. I was hoping to get input on if this is just a case > of "I'm doing it wrong" or maybe get some useful tips. > > In my prototype, I have a need to fan out a single tuple to several bolts > which do data retrieval from our database in parallel, which then get > merged back into a single stream. These data retrieval bolts all find > various hibernate entities and pass them along to the merge bolt. We've > written a kryo serializer that converts from the hibernate entities into > POJOs, which get sent to the merge bolt in tuples. Once all the tuples get > to the merge bolt, it collects them all into a single tuple and passes it > downstream to a bolt which does processing using the entities. > > So it looks something like this. > > ---- (retrieve bolt a) ---- > / ---- (retrieve bolt b) ----\ > /------(retrieve bolt c) -----\ > --- (split bolt)------(retrieve bolt d)-------(merge bolt) ----- > (processing bolt) > > So dealing with detaching the hibernate entities from the session to > serialize them, and then further downstream when we want to work with the > entities again, we have to reattach them to a new session....this seems > kind of awkward. > > Does doing the above make sense? Has anyone attempted to do the above? > Any tips or things we should watch out for? Basically looking for any kind > of input for this use case. > > Thanks! > >
