Wang Yuan a60ed4a599 Backup keys to slots map and restore when fail to sync if diskless-load type is swapdb in cluster mode (#8108)
When replica diskless-load type is swapdb in cluster mode, we didn't backup
keys to slots map, so we will lose keys to slots map if fail to sync.
Now we backup keys to slots map at first, and restore it properly when fail.

This commit includes a refactory/cleanup of the backups mechanism (moving it to db.c and re-structuring it a bit).

Co-authored-by: Oran Agra <oran@redislabs.com>
(cherry picked from commit b55a827ea2e19bd6cd48f216e8e6caa34299f9b9)
2021-01-12 16:25:37 +02:00
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