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3f2286d02e
"If we compact sstables A, B into a new sstable C we must either delete both A and B, or none of them. This is because a tombstone in B may delete data in A, and during compaction, both the tombstone and the data are removed. If only B is deleted, then the data gets resurrected. Non-atomic deletion occurs because the filesystem does not support atomic deletion of multiple files; but the window for that is small and is not addressed in this patchset. Another case is when A is shared across multiple shards (as is the case when changing shard count, or migrating from existing Cassandra sstables). This case is covered by this patchset. Fixes #1181."