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https://issues.apache.org/jira/browse/CAMEL-14980?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen updated CAMEL-14980:
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Fix Version/s: (was: Future)
> camel-kafka - SerializationException - consumer keeps leaving and rejoining
> the group
> -------------------------------------------------------------------------------------
>
> Key: CAMEL-14980
> URL: https://issues.apache.org/jira/browse/CAMEL-14980
> Project: Camel
> Issue Type: Bug
> Components: camel-kafka
> Affects Versions: 3.2.0
> Reporter: joseph m'bimbi-bene
> Priority: Major
> Fix For: 3.3.0
>
>
> Hello everyone,
>
> I found out i few days ago that if a `SerializationException` when the
> consumer tries to poll messages, it will keep leaving and joining the
> consumer-group indefinitely and without any informative log.
> After some searching in the code i found out the culprit:
> ``` java
> // org.apache.camel.component.kafka.KafkaConsumer (ligns 406-415):
> catch (KafkaException e) {
> // some kind of error in kafka, it may happen during
> // unsubscribing or during normal processing
> if (unsubscribing) {
> getExceptionHandler().handleException("Error unsubscribing " + threadId +
> " from kafka topic " + topicName, e);
> } else {
> LOG.debug("KafkaException consuming {} from topic {} causedby {}. Will
> attempt to re-connect on next run", threadId, topicName, e.getMessage());
> reConnect = true;
> }
> }
> ```
> `SerializationException` extends from `KafkaException`, but it is definitely
> not a recoverable exception.
> It logs with debug level, which makes it hard to track, there are SO many
> things logging in debug.
> It it cannot be handled by any camel exception handling mechanism.
> I think it would be better to either:
> - change that catch so that it pinpoints the subclasses of `KafkaException`
> that are actually recoverable from rejoining (maybe `WakeupException` and a
> couple others)
> - add a `catch` block for `SerializationException` and maybe
> `ConfigException` and `OAuthBearerConfigException` before, with a log error
> andallow the user to handle those exceptions
> - remove that catch block entirely and let users handle any KafkaException
> however they see fit.
> Thank you
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