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beadd248e3
When memtable receives a tombstone it can happen under some workloads that it covers data which is still in the memtable. Some workloads may insert and delete data within a short time frame. We could reduce the rate of memtable flushes if we eagerly drpo tombstoned data. One workload which benefits is the raft log. It stores a row for each uncommitted raft entry. When entries are committed they are deleted. So the live set is expected to be short under normal conditions. Fixes #652.