Confusion about max.poll.interval.ms and max.poll.records

[smares]

I am confused about max.poll.interval.ms and max.poll.records especially since we cannot set latter in librdkafka.

Let's say max.poll.interval.ms is set to the default 5 minutes and I have a consumer that takes 1 minute to process a single message. Given the default for max.poll.records is 500, does that mean I will always run into trouble (= rebalancing) every 5 messages consumed?

While reading the documentation, I assumed the first poll will fetch 500 messages and put them into an internal queue. Then I process the first message, 1 minute since the poll that retrieved 500 messages passes, then the second message, 2 minutes pass, third message, 3 minutes pass, fourth message, 4 minutes pass, fifth message, 5 minutes pass, BOOM, there hasn't been a poll for max.poll.interval.ms since all of the messages processed so far have been supplied from the internal queue.

Now I read in #3234 that max.poll.interval.ms isn't related to the poll from the broker, but the time between consuming two messages using high level consumer. Is that really so?

[smares]

By the way, I am indirectly using librdkafka through php-rdkafka-ffi in case that matters.