Simone, What you want to do is to override the toString() method on Event so that it produces a more helpful String as its result, and then use
stream.print() in your IDE (where stream is a DataStream<Event>). By the way, printOrTest(stream) isn't part of Flink -- that's just something used by the training exercises. Best, David On Tue, Nov 24, 2020 at 4:08 PM Simone Cavallarin <cavalla...@hotmail.com> wrote: > Hi, > > yes, I would like to debug locally on my IDE. > > This is what I tried so far, but no luck. > > a) String ff = result.toString(); > System.out.print(ff); > > b) printOrTest(stream); > > c) stream.print(); > > d) System.out.println(stream.print()); > > > This is the output and to me it looks like an "IDcode" that indicate each > Event on my application but i don't know how to access the data inside. My > Event is wrapped in a POJO. So each Event is something like this ['tom', > 1.70, 55, 1929219939, M....] > > p1.Event@1ca90014 > p1.Event@5e550c0c > p1.Event@402baa28 > p1.Event@5cf8ae00 > p1.Event@805bc2b > p1.Event@7e46f44b > p1.Event@63a17b41 > > Apologies, but I really don't understand if I write `DataStream#print()` I > just receive an error... i'm missing something here.. > On the example there are System.out.println(). > > Thanks > ------------------------------ > *From:* Timo Walther <twal...@apache.org> > *Sent:* 24 November 2020 11:50 > *To:* user@flink.apache.org <user@flink.apache.org> > *Subject:* Re: Print on screen DataStream content > > Hi Simone, > > if you are just executing DataStream pipelines locally in your IDE while > prototyping. You should be able to use `DataStream#print()` which just > prints to standard out [1] (It might be hidden between the log messages). > > For debugging locally, you can also just set breakpoints in your > functions like in `StatefulSessionCalculator` and use the debugging mode > of your IDE. > > Regards, > Timo > > [1] > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fflink%2Fblob%2Fmaster%2Fflink-examples%2Fflink-examples-streaming%2Fsrc%2Fmain%2Fjava%2Forg%2Fapache%2Fflink%2Fstreaming%2Fexamples%2Fwordcount%2FWordCount.java&data=04%7C01%7C%7Ce156804411e14d71ebec08d8906f357a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637418154590426156%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=OLLSzUOK5GhE9ES5Y7XsOXS2KKhUdZfcOkuDFFDfML8%3D&reserved=0 > > > On 24.11.20 11:09, Simone Cavallarin wrote: > > I tried to `DataStream#print()` but I don't quite understand how to > > implement it. Could you please give me an example? I'm using Intellij so > > what I would need is just to see the data on my screen. > > > > Thanks > > > > ------------------------------------------------------------------------ > > *From:* David Anderson <da...@alpinegizmo.com> > > *Sent:* 24 November 2020 10:01 > > *To:* Pankaj Chand <pankajchanda...@gmail.com> > > *Cc:* Austin Cawley-Edwards <austin.caw...@gmail.com>; Simone > Cavallarin > > <cavalla...@hotmail.com>; user@flink.apache.org <user@flink.apache.org> > > *Subject:* Re: Print on screen DataStream content > > When Flink is running on a cluster, `DataStream#print()` prints to files > > in the log directory. > > > > Regards, > > David > > > > On Tue, Nov 24, 2020 at 6:03 AM Pankaj Chand <pankajchanda...@gmail.com > > <mailto:pankajchanda...@gmail.com <pankajchanda...@gmail.com>>> wrote: > > > > Please correct me if I am wrong. `DataStream#print()` only prints to > > the screen when running from the IDE, but does not work (print to > > the screen) when running on a cluster (even a local cluster). > > > > Thanks, > > > > Pankaj > > > > On Mon, Nov 23, 2020 at 5:31 PM Austin Cawley-Edwards > > <austin.caw...@gmail.com <mailto:austin.caw...@gmail.com > <austin.caw...@gmail.com>>> wrote: > > > > Hey Simone, > > > > I'd suggest trying out the `DataStream#print()` function to > > start, but there are a few other easy-to-integrate sinks for > > testing that you can check out in the docs here[1] > > > > Best, > > Austin > > > > [1]: > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fci.apache.org%2Fprojects%2Fflink%2Fflink-docs-release-1.11%2Fdev%2Fdatastream_api.html%23data-sinks&data=04%7C01%7C%7Ce156804411e14d71ebec08d8906f357a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637418154590426156%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=eJzrCz1ZOIY%2FHp3Vy7vnhOSukKO9%2F58lxHOSdJSj9bY%3D&reserved=0 > > < > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fci.apache.org%2Fprojects%2Fflink%2Fflink-docs-release-1.11%2Fdev%2Fdatastream_api.html%23data-sinks&data=04%7C01%7C%7Ce156804411e14d71ebec08d8906f357a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637418154590426156%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=eJzrCz1ZOIY%2FHp3Vy7vnhOSukKO9%2F58lxHOSdJSj9bY%3D&reserved=0 > > > > > > On Mon, Nov 23, 2020 at 3:56 PM Simone Cavallarin > > <cavalla...@hotmail.com <mailto:cavalla...@hotmail.com > <cavalla...@hotmail.com>>> wrote: > > > > Hi All, > > > > On my code I have a DataStream that I would like to access. > > I need to understand what I'm getting for each > > transformation to check if the data that I'm working on make > > sense. How can I print into the console or get a file (csv, > > txt) for the variables: "stream", "enriched" and "result"? > > > > I have tried different way but no way to get the data. > > > > Thanks! > > / > > / > > / > > / > > / FlinkKafkaConsumer<Event> kafkaData =/ > > / new FlinkKafkaConsumer("CorID_1", new > > EventDeserializationSchema(), p);/ > > / WatermarkStrategy<Event> wmStrategy =/ > > / WatermarkStrategy/ > > / .<Event>forMonotonousTimestamps()/ > > / > .withIdleness(Duration.ofMinutes(1))/ > > / .withTimestampAssigner((event, > > timestamp) -> {/ > > / return event.get_Time();/ > > / });/ > > / DataStream<Event> *stream *= env.addSource(/ > > / > > kafkaData.assignTimestampsAndWatermarks(wmStrategy));/ > > / > > / > > / DataStream<Tuple2<Event, Long>> *enriched* = stream/ > > / .keyBy((Event KafkaMSG) -> KafkaMSG.CorrID)/ > > / .map(new StatefulSessionCalculator());/ > > / > > / > > / WindowedStream<Tuple2<Event, Long>, String, > > TimeWindow> *result* = enriched/ > > / .keyBy(new MyKeySelector())/ > > / > > .window(EventTimeSessionWindows.withDynamicGap(new > > DynamicSessionWindows()));/ > > > >
