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Questions tagged [flink-cep]

FlinkCEP - complex event processing for Apache Flink

368 questions
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flinkCEP query to database within select() function or SimpleCondition/IterativeCondition

Using a JDB connector I make queries to a PostgreSQL database and process the results. This works fine! BUT, when I try to query within a PatternFlatSelectFunction, in order the query results to be the condition on which I collect the new events, I…
alex
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Flink - behaviour of timesOrMore

I want to find pattern of events that follow Inner pattern is: Have the same value for key "sensorArea". Have different value for key "customerId". Are within 5 seconds from each other. And this pattern needs to Emit "alert" only if previous…
koren maliniak
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Flink CEP and events order

I am new to Flink and Flink CEP. When working with Event Time, does Flink CEP iterates the events to check patterns in ascending (event-)time order or not? Thanks in advance!
alex
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Flink pattern getting issue with Arralist in alert code?

I followed this example and implemented with kafka json same sample data. consumer sample data {"temperature" : 28,"machineName":"xyz"} DataStream patternStream = CEP.pattern(inputEventStream, warningPattern) .flatSelect(new…
Nathon
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How to apply conditions on Flink events?

I have implemented this Flink Kafka - Custom Class Data is always null. I gone thru the above link and implemented the same but how to apply condition on the events. Pattern eventspattern = Pattern. begin("first") …
Nathon
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How can I manually replay a tuple from a function in Apache Flink in case of run time exception?

In storm we execute collector.fail(tuple) to replay the tuple. What is the similar approach in Flink?
Raghavendar
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Flink CEP PojoSerializer wrong polymorphism resolution

Currently I have a really weird behavior when I'm printing the results of the CEP pattern. The data model as follows: Event: (type:String, timestamp:Long) VehicleRelated extends Event: (vehicleId:Integer) Position extends VehicleRelated:…
Daniel Eisenreich
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Add Savepoint to Datastream

I have a kafka source from which my flink application reads data and process it, i want to add flink's savepoint mechanism in order to resume the process from last where it was left, Instead of adding savepoint to the kafka source i want my…
Ahmad Qureshi
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Apache Flink CEP pattern of multiple event types

Currently I'm working on a semester project where I have to recognize the series of three Events. Like P -> R -> P We have two different event types which are consumed via a Kafka connector in the same topic. I created a parent class called Event…
Daniel Eisenreich
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How to write Junit test code for Flink CEP with Kafka consumer

We have a execute() method where we use FlinkKafkaConsumer08 as our Flink CEP source, then we have CEP pattern and alert is again going in another kafka topic. How can I write a junit test case for this execute() method? Can anyone please provide me…
Abhradeep Kundu
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Bypass Flink CEP Buffer in an EventTime Streaming Environment

I have an EventTime streaming application that uses the CEP library for a basic three-step pattern on a joined stream. The joined stream is a combination of live, watermarked, and windowed data and a stream of historical items outside of the…
austin_ce
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Flink - event-time sliding window with missing data in window due to time gaps

Suppose I have a stream of stock market trading events, like this: technical1, ALXN, 1/1/2016 technical1, CELG, 1/1/2016 technical2, ALXN, 1/2/2016 technical2, CELG, 1/2/2016 . . . technicalN, ALXN, 4/1/2018 technicalN, CELG, 4/1/2018 such that…
devinbost
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How to create batch or slide windows using Flink CEP?

I'm just starting with Flink CEP and I come from Esper CEP engine. As you may (or not) know, in Esper using their syntax (EPL) you can create a batch or slide window easily, grouping the events in those windows and allowing you to use this events…
David Corral
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AfterMatchSkipStrategy in FlinkCEP not getting applied

I'm trying to apply AfterMatchSkipStrategy skipPastLastEvent() into my pattern. But the problem is that i'm getting the same results as of the case when I don't apply the skipstrategy (NoSkip). Discards every partial match that started after the…
skrshn
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Creating CEP with Apache Flink

I'm trying to implement a very simple Apache Flink CEP for a Kafka InputStream. The Kafka Producer generates a simple Double Value and send them via a Kafka Topic as String towards the Consumers. At the moment i'm coding a CEP Consumer with…
Leon
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