kvserver: trim state used from snapshots #72314
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Snapshots contain a serialized copy of the `ReplicaState`. However, the snapshot itself contains that data already. Having two sources of data that may be interpreted differently can lead to problems, as we saw in [72239]. This commit deprecates using the entire ReplicaState. Instead, we pick out the descriptor and ignore everything else. Instead of using the copy of the state to initialize the recipient's in-memory state, we now use a state loader. In 22.2 we can only send the descriptor but maybe we won't do that; for logging and debugging it's kind of nice to have everything present. Fixes cockroachdb#72222. [cockroachdb#72239]: cockroachdb#72239 Release note: None
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Snapshots contain a serialized copy of the
ReplicaState. However, thesnapshot itself contains that data already. Having two sources of data
that may be interpreted differently can lead to problems, as we saw in
#72239.
This commit deprecates using the entire ReplicaState. Instead, we pick
out the descriptor and ignore everything else. Instead of using the
copy of the state to initialize the recipient's in-memory state, we
now use a state loader.
In 22.2 we can only send the descriptor but maybe we won't do that; for
logging and debugging it's kind of nice to have everything present.
Fixes #72222.
Release note: None