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A transfer source that misses the transfer abort (e.g. while partitioned
or paused) keeps its local shard wrapped in a proxy. When such a peer can
only catch up via consensus snapshot, snapshot application re-creates
payload indexes with an update operation that the stale forward proxy
forwards to a transfer target which may no longer have the shard. The
resulting precondition error fails snapshot application and stops the
consensus thread ("No target shard N found for update"), leaving the
peer unable to ever catch up.
Snapshot application now explicitly cleans up transfers that are no
longer registered in consensus: the transfer task is stopped and the
proxy is reverted via the new `ShardReplicaSet::discard_proxy_local`,
which is infallible, never contacts the remote, and forgets queued
updates (replica states in the same snapshot already reflect the
transfer outcome).
The consensus test reproduces the incident: pause the transfer source
mid-transfer, restart the other peers so the aborted transfer can only
be learned via snapshot, and verify the source recovers.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>