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Chris Lohfink commented on CASSANDRA-7247:
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Updated to always do it, but I think 2 or 3 are equally viable - its still
using executor to single-thread it for more performant StreamSummary and
provide a 1k backlog cap, especially since im not sure about performance impact
of now using the AbstractType. Instead of using the DecoratedKey.toString I
changed it to use the human readable format from the partitions type which
makes it more useful for debugging. If keeping this as an always on option I
can add a nodetool command to list them out in a nice format.
> Provide top ten most frequent keys per column family
> ----------------------------------------------------
>
> Key: CASSANDRA-7247
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7247
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Chris Lohfink
> Assignee: Chris Lohfink
> Priority: Minor
> Attachments: cassandra-2.1-7247.txt, jconsole.png, patch.txt
>
>
> Since already have the nice addthis stream library, can use it to keep track
> of most frequent DecoratedKeys that come through the system using
> StreamSummaries ([nice
> explaination|http://boundary.com/blog/2013/05/14/approximate-heavy-hitters-the-spacesaving-algorithm/]).
> Then provide a new metric to access them via JMX.
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