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From "Chris Lohfink (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-7247) Provide top ten most frequent keys per column family
Date Tue, 20 May 2014 21:33:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004005#comment-14004005
] 

Chris Lohfink edited comment on CASSANDRA-7247 at 5/20/14 9:32 PM:
-------------------------------------------------------------------

Added patch that uses the trace executor to track the partition thats updated the most, has
the most columns inserted (useful for finding rows that are too wide) and the partitions with
slowest insertion times.  Will only track if trace probability > 0.  Gives (key,count,error)
tuples


was (Author: cnlwsu):
Added patch that uses the trace executor to track the partition thats updated the most, has
the most columns inserted (useful for finding rows that are too wide) and the partitions with
slowest insertion times.  Will only track if trace probability > 0.

> 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: 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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