Branimir Lambov created CASSANDRA-12922:
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Summary: 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
Reporter: Branimir Lambov
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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