What’s the best way to work with message sequence numbers to ensure order and completeness?

Our recommendation for handling/processing with message sequence is as follows:

On beginning of day (one system event messages): Reset variable to 0;


On every other message:

If(messageSequnceNumber <= processMessageNumber) { Ignore message; }

Else If (messageSequnceNumber > processMessageNumber+1) {


Else {

processMessageNumber = messageSequnceNumber

ProcessMessage(BusinessLogic) }

We recommend this approach as Kafka (or any distributed system) can have dupes. We are working on reducing this from happening, but it can happen given the distributed nature of Kafka.

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