[jira] [Commented] (CASSANDRA-5159) Expose droppable tombstone ratio stats over JMX

["Daniel Kador (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-5159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13854943#comment-13854943 ] 

Daniel Kador commented on CASSANDRA-5159:
-----------------------------------------

We're seeing that the JMX value for DroppableTombstoneRatio for all our CFs is 0.0.  On the face of it that seems wrong since we've definitely issued a ton of deletes for row keys to expire some old data that we no longer need (and it definitely hasn't been reclaimed from disk yet).  Am I misunderstanding what this means / how to use it?  We're on 1.2.8 and using leveled compaction for all our CFs.

I can file a new issue for this if it'd be easier.

> Expose droppable tombstone ratio stats over JMX
> -----------------------------------------------
>
>                 Key: CASSANDRA-5159
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5159
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>    Affects Versions: 1.2.0
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Minor
>             Fix For: 1.2.1
>
>         Attachments: 0001-Expose-the-ratio-of-droppable-tombstones-over-JMX.patch
>
>
> Could be nice to be able to jmx-monitor the tombstone histogram collected during compactions to see how many gc-able tombstones there are left due to the row existing in other sstables



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