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From "Jonathan Ellis (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3515) track tombstone statistics
Date Tue, 10 Jan 2012 23:26:40 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-3515:
--------------------------------------

    Summary: track tombstone statistics  (was: add tombstones thats been filtered in cfhistograms)

We could also count tombstones-per-row during compaction and store the histogram in the metadata
component, than to count tombstones seen during reads.

Not *quite* as direct a red flag, since a heavily tombstoned row *could* be just fine if you're
doing name-based queries, but a lot easier to implement.  It also has the benefit of being
able to get stats w/o having to wait for reads to warm things up.

(CASSANDRA-1123 would give us the tools to build more fine-grained stats on a per-query basis.)
                
> track tombstone statistics
> --------------------------
>
>                 Key: CASSANDRA-3515
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3515
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jackson Chung
>            Priority: Minor
>             Fix For: 1.2
>
>
> i think summary says it all, but see further:
> {noformat}
>  driftx x: I guess we could add a histogram of how many tombstones we filtered on a read
>  driftx x: @action: go for it in that context
>  action jackson: thx!
>  mdennis x: +1 on histogram of filtered tombstones
>  driftx x: definitely useful for diagnosing the queue-like case
>  driftx x: the histogram I mea
> {noformat}

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