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

["Chris Lohfink (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-7974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Lohfink updated CASSANDRA-7974:
-------------------------------------
    Attachment: CASSANDRA-7974v3.txt

Attached with additional changes:
* Uses open type datatypes (compositedata with tabulardata) for safe mbean deserialization
* no longer exposes key validator, instead turns into human readable string along with raw bytes when sending over the compositedata
* use own executor instead of TRACE

> 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: Chris Lohfink
>             Fix For: 2.1.3
>
>         Attachments: 7974.txt, CASSANDRA-7974v3.txt, cassandra-2.1-7974v2.txt
>
>
> 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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