Replication Resynchronization

When a replication connection is established between AMPS instances, the upstream instance publishes any messages that it contains in its transaction log that the downstream instance may not have previously received. This process is called "replication resync". During resync, the upstream instance replays from the transaction log, replicating messages that match the Topic (and, optionally, Filter) specification(s) for the downstream Destination.

When a replication connection is established between AMPS servers that are both version 5.3.3.0 or higher, the servers exchange information about the messages present in the transaction log to determine the earliest message in the transaction log on the upstream instance that is not present on the downstream instance. Replication resynchronization will begin at that point. This approach to finding the resynchronization point applies whether or not these two instances have had a replication connection before.

For replication between older versions of AMPS, replication resynchronization begins at the last point in the upstream instance's transaction log that the downstream instance has received. For those versions of AMPS, messages from other instances are not considered when determining the resynchronization point.