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https://issues.apache.org/jira/browse/CASSANDRA-12922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-12922:
-----------------------------------------
Fix Version/s: (was: 4.0.x)
(was: 3.11.x)
(was: 4.x)
(was: 3.0.x)
4.1
4.0.1
3.11.11
3.0.25
Since Version: NA
Source Control Link:
https://github.com/apache/cassandra/commit/87424dabd20acfdbb9a4489f289ec075ccfb87b0
Resolution: Fixed
Status: Resolved (was: Ready to Commit)
CI looks good, committed. Thank you all.
> Bloom filter miss counts are not measured correctly
> ---------------------------------------------------
>
> Key: CASSANDRA-12922
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12922
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: Branimir Lambov
> Assignee: Aleksei Zotov
> Priority: Normal
> Labels: lhf
> Fix For: 3.0.25, 3.11.11, 4.0.1, 4.1
>
> Attachments: 12922-trunk.txt, cassandra-12922-3.0.txt,
> cassandra-12922-3.11.txt, cassandra-12922-4.0.txt, cassandra-12922-trunk.txt
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Bloom filter hits and misses are evaluated incorrectly in
> {{BigTableReader.getPosition}}: we properly record hits, but not misses. In
> particular, if we don't find a match for a key in the index, which is where
> almost all non-matches will be rejected, [we don't record a bloom filter
> false
> positive|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/format/big/BigTableReader.java#L228].
> This leads to very misleading output from e.g. {{nodetool tablestats}}.
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