Sheepdog send write request to all replica simultaneously to do the
replication. Which I think could lead to divergent content in replicas.
Imagine a scenario, there are two write requests A & B to update the
same offset in a 2-replicas object. If a qemu client send A and B to a
gateway concurrently, the gateway will send A and B to the same set of
replicas simultaneously. Which could not guarantee the same sequence to
apply A and B, you can apply A then B in a replica and apply B then A in
another replica, then you get two request return successfully but not
the same data in the replicas.
Is this a consistency problem in sheepdog? How can we deal with it?
--
Thanks,
Gu Ping
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