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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2014/09/18 23:38:34 UTC

[jira] [Commented] (CASSANDRA-7974) Enable tooling to detect hot partitions

    [ https://issues.apache.org/jira/browse/CASSANDRA-7974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139560#comment-14139560 ] 

Benedict commented on CASSANDRA-7974:
-------------------------------------

iirc, hll has some serious concurrency bugs

> Enable tooling to detect hot partitions
> ---------------------------------------
>
>                 Key: CASSANDRA-7974
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7974
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>
> Sometimes you know you have a hot partition by the load on a replica set, but have no way of determining which partition it is.  Tracing is inadequate for this without a lot of post-tracing analysis that might not yield results.  Since we already include stream-lib for HLL in compaction metadata, it shouldn't be too hard to wire up topK for X seconds via jmx/nodetool and then return the top partitions hit.



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