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From "Bart van der Schans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-3098) Add hit miss statistics and logging to caches
Date Fri, 07 Oct 2011 13:35:30 GMT

    [ https://issues.apache.org/jira/browse/JCR-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122798#comment-13122798
] 

Bart van der Schans commented on JCR-3098:
------------------------------------------

The element count can be useful to get a feel for the cache item sizes. The average size is
the used memory divided by the element count. It could also be useful to know if you have
a 100 elements with a 1000 hits or 10.000 elements with a 1000 hits. 

Bart

                
> Add hit miss statistics and logging to caches
> ---------------------------------------------
>
>                 Key: JCR-3098
>                 URL: https://issues.apache.org/jira/browse/JCR-3098
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Bart van der Schans
>             Fix For: 2.2.10, 2.3.1
>
>         Attachments: cache-stats.patch
>
>
> The current caches (ConcurrentCache) doesn't maintain hit and miss statistics. This makes
it very hard to know if you need to increase the caches in a deployment. This functionality
does exist in the 1.5 and 1.6 branches, but is missing from the 2.x branches. The patch adds
these statistics and adds logging on info level. The frequency of the logging is by default
configured to maximal once a minute but can be configured with the system property "org.apache.jackrabbit.cacheLogStatsInterval"
(in ms). 
> The log lines look like:
> 07.10.2011 09:00:39 INFO  [org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.logCacheStats():737]
name=defaultBundleCache[ConcurrentCache@54fb02fd] num=21074 mem=34504k max=65536k hits=93352
miss=21074 puts=21135
> 07.10.2011 09:00:40 INFO  [org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.logCacheStats():737]
name=versionBundleCache[ConcurrentCache@47b1de1a] num=10637 mem=250k max=8192k hits=36352
miss=10637 puts=10637
> This patch will also make possible to later on expose these statistics over JMX when
the initial JMX work has been settled.  

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