[jira] [Assigned] (CASSANDRA-9969) Expose the DTCS configuration parameters (base time, min threshold, max age) via jmx

["Jeremy Hanna (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-9969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeremy Hanna reassigned CASSANDRA-9969:
---------------------------------------

    Assignee: Jeremy Hanna

> Expose the DTCS configuration parameters (base time, min threshold, max age) via jmx
> ------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9969
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9969
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jeremy Hanna
>            Assignee: Jeremy Hanna
>              Labels: compaction, dtcs
>
> The DateTieredCompactionStrategy settings aren't exposed via JMX.  There are a few use cases for which this would be valuable.
> 1. Testing via write survey mode.  Currently you can change the compaction strategy class but are limited to change min/max compaction threshold.
> 2. Testing via trying out the strategy on one node in your existing cluster.  This helps you to understand the impact when transitioning from another compaction strategy to DTCS.
> 3. Transitioning your cluster to DTCS one node at a time for minimal impact (then of course changing the persisted schema).
> This should go back to 2.0 or at least 2.1 because it's really a simple oversight to not have exposed those in ColumnFamilyStoreMBean.



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