Josh Snyder created CASSANDRA-14160:
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Summary: maxPurgeableTimestamp should traverse tables in order of
minTimestamp
Key: CASSANDRA-14160
URL: https://issues.apache.org/jira/browse/CASSANDRA-14160
Project: Cassandra
Issue Type: Bug
Components: Compaction
Reporter: Josh Snyder
In maxPurgeableTimestamp, we iterate over the bloom filters of each overlapping
SSTable. Of the bloom filter hits, we take the SSTable with the lowest
minTimestamp. If we kept the SSTables in sorted order of minTimestamp, then we
could short-circuit the operation at the first bloom filter hit, reducing cache
pressure (or worse, I/O) and CPU time.
I've written (but not yet benchmarked) [some
code|https://github.com/hashbrowncipher/cassandra/commit/29859a4a2e617f6775be49448858bc59fdafab44]
to demonstrate this possibility.
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