Hello again! :) I have been checking the solution that you proprosed and but I don't really get how the KeyValueState helps on it. Could you please explain it a little bit more?
I have drawn a diagram to make what I want clear, notice that the middle table doesn't need to be a table, it is just what I want and I don't have enough knowledge on Flink to know how to do it. Thanks for your time! 2016-05-26 20:33 GMT+02:00 Konstantin Knauf <konstantin.kn...@tngtech.com>: > Hi, > > interesting use case, you are looking for sure bets, I guess ;) > > Well, I think, what you want to then is probably to use a > ConnectedStream, which you keyBy the "name" of both streams. > > The you can use CoFlatMap for comparison. You can use a KeyValueState zu > save prices. In each map you can then check if you have a price for this > name already saved from the other stream and if not save the price. The > challenge will be to clean up state. > > Let me know, if this works out. > > Cheers, > > Konstantin > > On 26.05.2016 20:01, iñaki williams wrote: > > Hi! > > > > I will explain it with more details: > > > > I am comparing real time sport odds from two different betting Webpages. > > > > Assuming that I get just one java object (in reality I should get a List > > of in-play matches), for each DataStream and assuming that the name is > > the same of course, what I want to do is compare both price attributes > > in "real time", I am only interested on the currently price, not the > > previous one. Example: > > > > What is the price for the Event 1 from website "X" RIGHT NOW? > > > > JavaObjectX.price > > > > What is the price for the Event 1 from website "Y" RIGHT NOW? > > > > JavaObjectY.price > > > > > > Compare both attributes > > Get a result depending on that comparison > > > > My java object doesn't have a timestamp, but I think I should use it > right? > > > > > > Thanks! > > > > > > > > > > > > > > > > 2016-05-26 19:48 GMT+02:00 Konstantin Knauf > > <konstantin.kn...@tngtech.com <mailto:konstantin.kn...@tngtech.com>>: > > > > Hi, > > > > let me first check, if I understand your requirements correctly. I > > assume you want to compare attribute price for objects with the same > > name only, right? > > > > Further, I assume the objects are some kind of offer/bid with a > > timestamp? > > > > I think the solution heavily depends on how the records, which > should be > > compared relate in time. So basically, if an object arrives from one > > source, which time window of objects from the other stream should be > > considered for comparison? > > > > Cheers, > > > > Konstantin > > > > On 26.05.2016 18 <tel:26.05.2016%2018>:55, iñaki williams wrote: > > > Hi! > > > > > > I am working on something quite similar to the stockPrice example > that > > > is posted on the webpage > > > (https://flink.apache.org/news/2015/02/09/streaming-example.html) > > > > > > I am extracting some data from 2 different webpages and I > > represent the > > > result using a java object. The diagram could be something like > this: > > > > > > DataStream1--------JavaObject(name, price) --\ > > > > \ > > > > [ > > > how to compare result?] > > > > / > > > DataStream2--------JavaObject(name, price) --/ > > > > > > > > > What I want to do is to get the attribute price from both data > objects > > > and compare it between each other / make some math operations. For > > > example, if the first JavaObject.price is bigger than the second > > > JavaObject.price, then show a message. > > > > > > > > > Which is the (best) way of doing this? I am new using Flink and I > am > > > quite lost :) > > > > > > > > > Thanks! > > > > -- > > Konstantin Knauf * konstantin.kn...@tngtech.com > > <mailto:konstantin.kn...@tngtech.com> * +49-174-3413182 > > <tel:%2B49-174-3413182> > > TNG Technology Consulting GmbH, Betastr. 13a, 85774 Unterföhring > > Geschäftsführer: Henrik Klagges, Christoph Stock, Dr. Robert Dahlke > > Sitz: Unterföhring * Amtsgericht München * HRB 135082 > > > > > > -- > Konstantin Knauf * konstantin.kn...@tngtech.com * +49-174-3413182 > TNG Technology Consulting GmbH, Betastr. 13a, 85774 Unterföhring > Geschäftsführer: Henrik Klagges, Christoph Stock, Dr. Robert Dahlke > Sitz: Unterföhring * Amtsgericht München * HRB 135082 >
