sven-lange-last edited a comment on issue #3912: Fix max.poll.interval.ms setting of KafkaConsumer. URL: https://github.com/apache/incubator-openwhisk/pull/3912#issuecomment-408808728 The Kafka new Java consumer documentation contains the following hint in the [notables changes section for 0.10.1.0](https://kafka.apache.org/documentation/#upgrade_1010_notable): > The new Java Consumer now supports heartbeating from a background thread. There is a new configuration max.poll.interval.ms which controls the maximum time between poll invocations before the consumer will proactively leave the group (5 minutes by default). **The value of the configuration request.timeout.ms must always be larger than max.poll.interval.ms because this is the maximum time that a JoinGroup request can block on the server while the consumer is rebalancing**, so we have changed its default value to just above 5 minutes. At the moment, we have `request.timeout.ms` < `max.poll.interval.ms` and this PR will also keep the value smaller. I guess that this should not harm in our situation with a single consumer group per topic, a single partition per topic and a single consumer process in the consumer group. But I don't understand all implications...
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