Jose Luis Pedrosa created CAMEL-9835:
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Summary: Enable kafka consumer to subcribe to multiple topics
Key: CAMEL-9835
URL: https://issues.apache.org/jira/browse/CAMEL-9835
Project: Camel
Issue Type: Wish
Components: camel-kafka
Affects Versions: 2.17.0
Environment: Any
Reporter: Jose Luis Pedrosa
Priority: Minor
Fix For: 2.17.1
Kafka supports that one consumer is subcriber to multple topics. In their api
when you start the consumer you MUST provide an Array of topics.
If we look in /java/org/apache/camel/component/kafka/KafkaConsumer.java
Currently this is the piece of code that starts the subscriber:
{code}
LOG.debug("Subscribing {} to topic {}", threadId, topicName);
consumer.subscribe(Arrays.asList(topicName));
{code}
just simply allowing the comma separated topic syntax and replacing one line of
code (and the documentation) it would be working.
{code}
LOG.debug("Subscribing {} to topic {}", threadId, topicName);
consumer.subscribe(Arrays.asList(topicName.split(",")));
{code}
Despite the same could be achieved by adding more consumers (rotues) this
causes a significant amount of load (because of the commits) to kafka, so this
really helps to improve performance.
the topic has been already marked as mandatory, so that should keep the
nullpointer safe.
@UriParam @Metadata(required = "true")
private String topic;
thanks!
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