[jira] Commented: (CASSANDRA-2171) Record and expose flush rate per CF

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004190#comment-13004190 ] 

Jonathan Ellis commented on CASSANDRA-2171:
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It's not clear to me what kind of data is useful for CASSANDRA-2156.  Why a sliding window?

If a sliding window is the way to go, then I'd prefer to use a subclass of AbstractStatsDeque than a CSLM.  We used to have one (https://svn.apache.org/repos/asf/cassandra/branches/cassandra-0.5/src/java/org/apache/cassandra/utils/TimedStatsDeque.java -- not 100% sure that's the most recent version) before we pulled sliding window stats out of the rest of Cassandra -- expensive to maintain and not actually substantially more useful than simpler metrics, which is one reason I want to make sure we're not violating YAGNI here.

> Record and expose flush rate per CF
> -----------------------------------
>
>                 Key: CASSANDRA-2171
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2171
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.8
>            Reporter: Stu Hood
>            Assignee: Alan Liang
>             Fix For: 0.8
>
>         Attachments: expose_flush_rate_per_cf_patch.diff
>
>
> In order to automatically throttle compaction to some multiple of the flush rate, we need to record the flush rate across the system. Since this might be useful information on a per CF basis, this ticket will deal with recording the flush rate in the CFStore object, and exposing it via JMX.

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