Aleksey Yeschenko created CASSANDRA-4667:
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Summary: optimize memtable deletions for batchlog
Key: CASSANDRA-4667
URL: https://issues.apache.org/jira/browse/CASSANDRA-4667
Project: Cassandra
Issue Type: Sub-task
Reporter: Aleksey Yeschenko
Batchlog writes with the same key are never retried. This means that if a
batchlog row is in the memtable, it can't be in any of the sstables, ever. In
such cases we don't need to write a tombstone to disk. We can purge the row
completely from the memtable and only write a tombstone if the row had been
flushed already (if it's not in the memtable then it must be in one of the
sstables).
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