f181e17038
Because concurrent sync requests from a primary to its replicas could be in flight, it can be the case that an older retention leases collection arrives and is processed on the replica after a newer retention leases collection has arrived and been processed. Without a defense, in this case the replica would overwrite the newer retention leases with the older retention leases. This commit addresses this issue by introducing a versioning scheme to retention leases. This versioning scheme is used to resolve out-of-order processing on the replica. We persist this version into Lucene and restore it on recovery. The encoding of retention leases is starting to get a little ugly. We can consider addressing this in a follow-up. |
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