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https://issues.apache.org/jira/browse/CASSANDRA-5479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-5479.
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Resolution: Won't Fix
Already noted as a feature request for CASSANDRA-4775.
> hyper log log (hyperloglog) probabilistic counters
> --------------------------------------------------
>
> Key: CASSANDRA-5479
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5479
> Project: Cassandra
> Issue Type: Wish
> Reporter: Nikolay
> Priority: Minor
>
> Would be nice if we can include probabilistic counters in Cassandra.
> People do not use them because people do not know their power.
> HyperLogLog also can merge counters, so in case of node disconnections,
> will be easy to have different versions on each node. When node come online,
> it just merge the data from other nodes.
> Same can be used when adding data - similarly to Counter_CF,
> HyperLogLog will need to read single replica and add there.
> Adding can be even add without reading - just drop the new "item" somewhere,
> but then reading will be much more slow.
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