How can we recover sstable if it is corrupted or deleted at the OS level?
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If an sstable is deleted it cannot be recovered unless you have a backup. Alternatively, if this cluster is replicated, meaning you have a replication factor greater than 1, then you could just run a repair on that table and the sstable will get regenerated. If you have an RF of 1 only, then there's no alternative but to restore from backup/snapshot.
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