Hi, I am new to Flink. I have a question on this "rolling" fold function.
If its parallelism is large than one, does the "rolling" order remains the same? i.e. it is always keep the "1-2-3-4-5" on an increasing sequence. Regards, Min ------------------------------------------------------------------- FoldFunction --------------------------------------------------------------------------------------------------------------- A "rolling" fold on a keyed data stream with an initial value. Combines the current element with the last folded value and emits the new value. A fold function that, when applied on the sequence (1,2,3,4,5), emits the sequence "start-1", "start-1-2", "start-1-2-3", ... DataStream<String> result = keyedStream.fold("start", new FoldFunction<Integer, String>() { @Override public String fold(String current, Integer value) { return current + "-" + value; } }); ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- From: jincheng sun [mailto:sunjincheng...@gmail.com] Sent: Freitag, 7. Dezember 2018 02:24 To: rakkukumar2...@gmail.com Cc: user@flink.apache.org; d...@flink.apache.org Subject: [External] Re: delay one of the datastream when performing join operation on event-time and watermark Hi Pakesh Kuma, I think you can using the interval-join, e.g.: orderStream .keyBy(<KeySelector>) .intervalJoin(invoiceStream.keyBy(<KeySelector>)) .between(Time.minutes(-5), Time.minutes(5)) The semantics of interval-join and detailed usage description can refer to https://ci.apache.org/projects/flink/flink-docs-release-1.7/dev/stream/operators/joining.html#interval-join Hope to help you, and any feedback is welcome! Bests, Jincheng Rakesh Kumar <rakkukumar2...@gmail.com<mailto:rakkukumar2...@gmail.com>> 于2018年12月6日周四 下午7:10写道: Hi, I have two data sources one is for order data and another one is for invoice data, these two data i am pushing into kafka topic in json form. I wanted to delay order data for 5 mins because invoice data comes only after order data is generated. So, for that i have written a flink program which will take these two data from kafka and apply watermarks and delay order data for 5 mins. After applying watermarks on these data, i wanted to join these data based on order_id which is present in both order and invoice data. After Joining i wanted to push it to kafka in different topic. But, i am not able to join these data streams with 5 min delay and i am not able to figure it out. I am attaching my flink program below and it's dependency.
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