Lost update packet

If you have lost an update packet, the state of the replica being updated might not be accurate. You should reset the epoch row in the replica being updated and run the synchronization export from the updating replica again.

The syncreplica –export command assumes successful delivery of the update packet it generates. For example, when replica boston_hub sends an update to replica sanfran_hub, the syncreplica command assumes that the operations originating at boston_hub are imported to the sanfran_hub replica. For simplicity, this example does not reflect the fact that the update packet can also contain operations that originated at other replicas in the VOB family.

But, if the packet is lost, this assumption is invalid, and boston_hub must reset its estimate of the state of replica sanfran_hub by resetting the epoch row. After this correction is made, the next update packet sent from boston_hub to sanfran_hub contains the operations sanfran_hub needs.

To reset the epoch row to match the actual state of the receiving replica, use one of the methods described here.