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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7247) Provide top ten most frequent keys per column family
Date Wed, 18 Jun 2014 18:38:25 GMT


Jonathan Ellis commented on CASSANDRA-7247:

Using tracingProbability as a coarse on/off feels wrong to me.  I'd prefer one of these options:

# If it's cheap, just do it always
# If it makes sense to do it along with other tracing ops, trace if we've enabled a trace
state already
# Otherwise, introduce a new per-table setting

> Provide top ten most frequent keys per column family
> ----------------------------------------------------
>                 Key: CASSANDRA-7247
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Minor
>         Attachments: 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|]).
 Then provide a new metric to access them via JMX.  

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