On 8 February 2018 at 10:44:59 AM, Marchant, Hayden ([hidden email]) wrote:
I know that traditionally Kafka is used as a source for a streaming job. In our particular case, we are looking at extracting records from a Kafka topic from a particular well-defined offset range (per partition) - i.e. from offset X to offset Y. In this case, we'd somehow want the application to know that it has finished when it gets to offset Y. This is basically changes Kafka stream to be bounded data as opposed to unbounded in the usual Stream paradigm.
What would be the best approach to do this in Flink? I see a few options, though there might be more:
1. Use a regular streaming job, and have some external service that monitors the current offsets of the consumer group of the topic and manually stops job when the consumer group of the topic has finished
Pros - simple wrt Flink, Cons - hacky
2. Create a batch job, and a new InputFormat based on Kafka that reads the specified subset of Kafka topic into the source.
Pros - represent bounded data from Kafka topic as batch source, Cons - requires implementation of source.
3. Dump the subset of Kafka into a file and then trigger a more 'traditional' Flink batch job that reads from a file.
Pros - simple, cons - unnecessary I/O.
I personally prefer 1 and 3 for simplicity. Has anyone done anything like this before?
Thanks,
Hayden Marchant
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