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Posted to commits@cassandra.apache.org by "Josh Snyder (JIRA)" <ji...@apache.org> on 2018/01/10 18:17:00 UTC
[jira] [Created] (CASSANDRA-14160) maxPurgeableTimestamp should
traverse tables in order of minTimestamp
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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