Marcus Eriksson updated CASSANDRA-14160:
    Reviewer: Marcus Eriksson  (was: Jeff Jirsa)

> 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
>            Assignee: Josh Snyder
>            Priority: Major
>              Labels: performance
>             Fix For: 4.x
> 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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