Re: Iterate several kafka topics using the kafka connector

[Till Rohrmann]

It is possible to instantiate the FlinkKafkaConsumer with multiple topics
[1]. Simply pass a list of topic names instead of a the name of a single
topic.

streams.add(env.addSource(new
FlinkKafkaConsumer09<>(Arrays.asList("foo", "bar", "foobar"),
                    new JSONSchema(), properties));

[1]
https://ci.apache.org/projects/flink/flink-docs-master/apis/streaming/connectors/kafka.html#kafka-consumer

Cheers,
Till
​

On Thu, Jun 23, 2016 at 2:33 PM, Sendoh <unicorn.bana...@gmail.com> wrote:

> Hi Flink developers,
>
> Can I ask how could we iterate several Kafka topics using the Kafka
> connector?
>
> Our idea is like the following example:
>
> List<DataStream&lt;JSONObject>> streams = new ArrayList<>();
>
> // Iterate kafka topics
> Iterator<String> topicIter = topicList.iterator();
>
>         while (topicIter.hasNext()){
>
>             String topic = topicIter.next();
>
>             streams.add(env.addSource(new FlinkKafkaConsumer09<>(topic,
>                     new JSONSchema(), properties)).rebalance());
>
>         }
>
> Our goal is to union several kafka data streams into one, given the topics
> as a list:
>
>         Iterator<DataStream&lt;JSONObject>> streamsIt = streams.iterator();
>
>         DataStream<JSONObject> currentStream = streamsIt.next();
>         while(streamsIt.hasNext()){
>             DataStream<JSONObject> nextStream = streamsIt.next();
>             currentStream = currentStream.union(nextStream);
>         }
>
> Cheers,
>
> Sendoh
>
>
>
> --
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