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https://issues.apache.org/jira/browse/CASSANDRA-4043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-4043:
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Assignee: Tyler Hobbs
> RecentBloomFilterFalseRatio and RecentBloomFilterFalsePositives reset each
> other
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-4043
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4043
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.8
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Trivial
> Labels: jmx
>
> If either of the ColumnFamily JMX attributes {{RecentBloomFilterFalseRatio}}
> or {{RecentBloomFilterFalsePositives}} are read, both are reset. This means
> if you try to read both attributes at the same time (like jconsole does, for
> example), one of them is guaranteed to be 0.
> The solution might be that we store a separate false positives counter for
> the ratio and the normal count and reset them separately. Some refactoring
> should be done at the same time so that the BloomFilterTracker calculates the
> false positive ratio itself instead of having DataTracker fetch both counters
> and calculate the ratio.
> On a related note, why does nodetool not use the Recent versions of the bloom
> filter metrics?
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