Yang Bodong 10f94b0ab1
Swapdb should make transaction fail if there is any client watching keys (#8239)
This PR not only fixes the problem that swapdb does not make the
transaction fail, but also optimizes the FLUSHALL and FLUSHDB command to
set the CLIENT_DIRTY_CAS flag to avoid unnecessary traversal of clients.

FLUSHDB was changed to first iterate on all watched keys, and then on the
clients watching each key.
Instead of iterating though all clients, and for each iterate on watched keys.

Co-authored-by: Oran Agra <oran@redislabs.com>
2021-01-04 14:48:28 +02:00
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