Did you know that partitions play an important role in how Kafka guarantees message order?

Messages sent to Kafka from producers are assigned a key, for instance a username, email address, or phone number could be keys. Messages with the same key are always sent to the same partition.

Then, a second important piece of the partitions' role in message ordering is that a partition only sends messages to a single consumer.

Both of these above restrictions help to guarantee order by removing the potential for reduced speed or unavailability of a partition or consumer causing misordering of messages.

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