Is there a way to get number of messages in Kafka topic

Question

Is there a way to get number of unprocessed messages in Kafka topic using cppkafka or librdkafka? I guess it has something to do with offsets, but I'm unsure how to do that.

Answer 1

From: https://github.com/confluentinc/librdkafka/blob/master/CONFIGURATION.md, it is consume.callback.max.messages. GitHub discussion: https://github.com/confluentinc/librdkafka/issues/248