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4bd4aa2e88
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 drop 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. Closes #10807 * github.com:scylladb/scylla: memtable: Add counters for tombstone compaction memtable, cache: Eagerly compact data with tombstones memtable: Subtract from flushed memory when cleaning mvcc: Introduce apply_resume to hold state for partition version merging test: mutation: Compare against compacted mutations compacting_reader: Drop irrelevant tombstones mutation_partition: Extract deletable_row::compact_and_expire() mvcc: Apply mutations in memtable with preemption enabled test: memtable: Make failed_flush_prevents_writes() immune to background merging