Getting the last message sent to a kafka topic

Question

I\'m new to Kafka and working on a prototype to connect a proprietary streaming service into Kafka.

I\'m looking to get the key of the last message sent on a topic a

Answer 1

Check the record count and get the last message:

    // Poll so we know we're connected
    consumer.poll(100);
    // Get the assigned partitions
    Set assignedPartitions = consumer.assignment();
    // Seek to the end of those partitions
    consumer.seekToEnd(assignedPartitions);

    for (TopicPartition partition : assignedPartitions) {
        final long offset = consumer.committed(partition).offset();
        // Seek to the previous message
        consumer.seek(partition, offset - 1);
    }

    // Now get the last message
    ConsumerRecords records = consumer.poll(100);
    int size = records.count();
    int index = 0;
    for (ConsumerRecord record : records) {
        index = index + 1;
        if (index == size) {
            String value = record.value();
            System.out.println("Last Message = " + value);
        }
    }
    consumer.close();