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From "Alex Parvulescu (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (JCR-3098) Add hit miss statistics and logging to caches
Date Thu, 13 Oct 2011 13:46:12 GMT

     [ https://issues.apache.org/jira/browse/JCR-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Parvulescu resolved JCR-3098.
----------------------------------

    Resolution: Fixed

Fixed 
 on trunk in revision 1182713 and 1182835.
 on the 2.2 branch in revision 1182853.
                
> 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, 2.3.2
>
>         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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