You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@cassandra.apache.org by "Benjamin Lerer (Jira)" <ji...@apache.org> on 2021/07/30 12:54:00 UTC
[jira] [Updated] (CASSANDRA-14160) maxPurgeableTimestamp should
traverse tables in order of minTimestamp
[ https://issues.apache.org/jira/browse/CASSANDRA-14160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Lerer updated CASSANDRA-14160:
---------------------------------------
Status: Needs Reviewer (was: Patch Available)
> 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: Local/Compaction
> Reporter: Josh Snyder
> Assignee: Josh Snyder
> Priority: Normal
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org