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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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Cameron Zemek updated CASSANDRA-12922:
--------------------------------------
Reproduced In: 3.7
Labels: lhf (was: )
Component/s: Local Write-Read Paths
> 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: Local Write-Read Paths
> Reporter: Branimir Lambov
> Assignee: Mahdi Mohammadi
> Labels: lhf
>
> 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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