hard20 pts · first answer countskafkadistributed-systems

Account events processed out of order

An "account debited" event is sometimes processed before the "account opened" event for the same account. The producer sends messages without a key to a 12-partition topic. What is the fix?

A.Create a separate consumer group for each accountB.Increase the number of partitions to 48C.Have each consumer buffer messages for a few seconds and sort them by producer timestamp before processingD.Use the account id as the message key so all of an account's events go to the same partition

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Account events processed out of order

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