Hi All, Our use case is to use sliding window. (for e.g. at any point, whenever > user performs any actions at time [ t1 ], we would like to see his activity > in [ t1 - last 24 hours]. Using this, to show the user some recommendations.
-- I have code ready and it works without any errors. -- aggregations happen as expected. -- but the output generated is unexpected. As windows gets slides, i am getting mixed output which includes intermediate aggregated records also coming with final aggregated outputs. Could someone please help me here ? what can I do here to get ONLY final aggregated output. Code snippet : ________________________________________________________________ builder.stream(tempReadingTopic, Consumed.with(stringSerde, inputSerde)) .filter((k, v) -> v != null) .map((k,v) -> KeyValue.pair(v.getUserId(), v)) //.through("slidingbykey", Produced.with(Serdes.String(), inputSerde)) .groupByKey() .windowedBy(SlidingWindows.ofTimeDifferenceAndGrace(Duration.ofMillis(5000), windowDuration)) .aggregate(OutputPojo::new, (k, tr, out) -> { out.setUserId(tr.getUserId()); out.setCount(out.getCount() +1); out.setSum(out.getSum() + tr.getInt4()); out.setUuid(tr.getUuid()); out.setStrTime(TimestampLongToString.getTime(tr.getTimestamp())); waitForMs(200); //added delay just for analysing output return out; }, Materialized.with(stringSerde, outputSerde)) .suppress(Suppressed.untilTimeLimit(windowDuration, Suppressed.BufferConfig.unbounded())) .toStream() .map((Windowed<String> key, OutputPojo out) -> { return new KeyValue<>(key.key(),out) ; }) .print(Printed.toSysOut()); // .to(aveTempOutputTopic, Produced.with(stringSerde, outputSerde)) ; ________________________________________________________________ Input data : for i in {1..10}; do sleep 1s;python3 del.py 1001 10;sleep 1s; done > {'userId': '1001', 'timestamp': 1652781716234, 'int4': 10, 'uuid': > '64f019ee-9cf4-427d-b4c9-f2b5f88820e1'} > {'userId': '1001', 'timestamp': 1652781718436, 'int4': 10, 'uuid': > 'cf173b3e-c34f-470a-ba15-ef648d0be8b9'} > {'userId': '1001', 'timestamp': 1652781720634, 'int4': 10, 'uuid': > '48d2b4ea-052d-42fa-a998-0216d928c034'} > {'userId': '1001', 'timestamp': 1652781722832, 'int4': 10, 'uuid': > '55a6c26c-3d2c-46f1-ab3c-04927f660cbe'} > {'userId': '1001', 'timestamp': 1652781725029, 'int4': 10, 'uuid': > 'dbfd8cee-565d-496b-b5a8-773ae64bc518'} > {'userId': '1001', 'timestamp': 1652781727227, 'int4': 10, 'uuid': > '135dc5cd-50cb-467b-9e63-300fdeedaf75'} > {'userId': '1001', 'timestamp': 1652781729425, 'int4': 10, 'uuid': > '66d8e3c7-8f63-43ca-acf1-e39619bf33a0'} > {'userId': '1001', 'timestamp': 1652781731623, 'int4': 10, 'uuid': > 'f037712b-42a5-4449-bcc2-cf6eafddf5ad'} > {'userId': '1001', 'timestamp': 1652781733820, 'int4': 10, 'uuid': > '7baa4254-b9da-43dc-bbb7-4caede578aeb'} > {'userId': '1001', 'timestamp': 1652781736018, 'int4': 10, 'uuid': > '16541989-f3ba-49f6-bd31-bf8a75ba8eac'} ________________________________________________________________ Output (*Unexpected*) : below output is captured at each sliding window of 1s duration (but input data is published at 2s of interval) : [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:31:28.263, > uuid=966277fd-3bdc-45c2-aa6a-c9c0dbe89c34) ----> seems older UUID > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=1, sum=10.0, > strTime=2022-05-17 15:31:28.263, uuid=966277fd-3bdc-45c2-aa6a-c9c0dbe89c34) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=1, sum=10.0, > strTime=2022-05-17 15:31:56.234, uuid=64f019ee-9cf4-427d-b4c9-f2b5f88820e1) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:31:58.436, uuid=cf173b3e-c34f-470a-ba15-ef648d0be8b9) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:00.634, uuid=48d2b4ea-052d-42fa-a998-0216d928c034) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:00.634, uuid=48d2b4ea-052d-42fa-a998-0216d928c034) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:02.832, uuid=55a6c26c-3d2c-46f1-ab3c-04927f660cbe) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:02.832, uuid=55a6c26c-3d2c-46f1-ab3c-04927f660cbe) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:05.029, uuid=dbfd8cee-565d-496b-b5a8-773ae64bc518) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:05.029, uuid=dbfd8cee-565d-496b-b5a8-773ae64bc518) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:07.227, uuid=135dc5cd-50cb-467b-9e63-300fdeedaf75) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:07.227, uuid=135dc5cd-50cb-467b-9e63-300fdeedaf75) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:09.425, uuid=66d8e3c7-8f63-43ca-acf1-e39619bf33a0) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:09.425, uuid=66d8e3c7-8f63-43ca-acf1-e39619bf33a0) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:11.623, uuid=f037712b-42a5-4449-bcc2-cf6eafddf5ad) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:11.623, uuid=f037712b-42a5-4449-bcc2-cf6eafddf5ad) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:13.820, uuid=7baa4254-b9da-43dc-bbb7-4caede578aeb) > > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=3, sum=30.0, > strTime=2022-05-17 15:32:13.820, uuid=7baa4254-b9da-43dc-bbb7-4caede578aeb) > [KSTREAM-MAP-0000000011]: 1001, OutputPojo(userId=1001, count=2, sum=20.0, > strTime=2022-05-17 15:32:16.018, uuid=16541989-f3ba-49f6-bd31-bf8a75ba8eac) Regards, Shankar