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From "Lyuben Todorov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8880) Add metrics to monitor the amount of tombstones created
Date Mon, 30 Mar 2015 12:26:53 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386623#comment-14386623
] 

Lyuben Todorov commented on CASSANDRA-8880:
-------------------------------------------

Sounds reasonable, so we count the created tombstones, and range tombstones. I think we might
need separate metrics to avoid confusion between the two meaning, or is it a fair assumption
that tombstones and range tombstones should be counted together?

> Add metrics to monitor the amount of tombstones created
> -------------------------------------------------------
>
>                 Key: CASSANDRA-8880
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8880
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Michaël Figuière
>            Priority: Minor
>              Labels: metrics
>             Fix For: 2.1.4
>
>         Attachments: cassandra-2.1-8880.patch
>
>
> AFAIK there's currently no way to monitor the amount of tombstones created on a Cassandra
node. CASSANDRA-6057 has made it possible for users to figure out how many tombstones are
scanned at read time, but in write mostly workloads, it may not be possible to realize if
some inappropriate queries are generating too many tombstones.
> Therefore the following additional metrics should be added:
> * {{writtenCells}}: amount of cells that have been written
> * {{writtenTombstoneCells}}: amount of tombstone cells that have been written
> Alternatively these could be exposed as a single gauge such as {{writtenTombstoneCellsRatio}}.



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