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From "Jukka Zitting (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-3117) Stats for the PersistenceManager
Date Thu, 20 Oct 2011 09:02:11 GMT

    [ https://issues.apache.org/jira/browse/JCR-3117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131462#comment-13131462

Jukka Zitting commented on JCR-3117:

Wouldn't it be easier to just use the AtomicLong counters from the TimeSeries mechanism? That
way we wouldn't have to add new interfaces and implementations for each piece of statistics
we want to collect?
> Stats for the PersistenceManager
> --------------------------------
>                 Key: JCR-3117
>                 URL: https://issues.apache.org/jira/browse/JCR-3117
>             Project: Jackrabbit Content Repository
>          Issue Type: Sub-task
>          Components: jackrabbit-core
>            Reporter: Alex Parvulescu
>            Assignee: Alex Parvulescu
>            Priority: Minor
>             Fix For: 2.3.2
>         Attachments: JCR-3117.patch
> Statistics for the PersistenceManager impl that cover: 
>  - bundle cache access count, 
>  - bundle cache miss count, 
>  - bundle cache miss avg duration (this avg includes the penalty of having to load from
the underlying storage / can be interpreted as avg read latency as there is no cache involved)

>  - bundle writes per second
> What it doesn't cover is :
>  - number of bundles
>  - size of workspace
> as these are values that are expensive to compute on demand, and caching them would imply
being able to store the values (which is not possible currently).

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