What's the difference between sync and async replication?

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The difference between sync replication and async replication is when AMPS tells the publisher that the message has been persisted.

With sync replication, AMPS does not acknowledge to the publisher that a message has been persisted until downstream instances acknowledge that the message has been persisted.

With async replication, AMPS acknowledges to the publisher that a message has been persisted when AMPS acknowledges that the message has been persisted.

There is no difference in when AMPS writes the message to the transaction log, or when the message is available to subscribers.

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