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From "Sundar Srinivasan (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-12922) Bloom filter miss counts are not measured correctly
Date Mon, 24 Jul 2017 08:11:00 GMT


Sundar Srinivasan updated CASSANDRA-12922:
    Attachment: 12922-trunk.txt

Please let me know if this looks fine and I will proceed to write a unit test as noted for
the previous fix.

> Bloom filter miss counts are not measured correctly
> ---------------------------------------------------
>                 Key: CASSANDRA-12922
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Branimir Lambov
>            Assignee: Mahdi Mohammadi
>              Labels: lhf
>             Fix For: 4.x
>         Attachments: 12922-trunk.txt
> 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|].
> This leads to very misleading output from e.g. {{nodetool tablestats}}.

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