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https://issues.apache.org/jira/browse/OAK-863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chetan Mehrotra updated OAK-863:
--------------------------------
Attachment: OAK-863-2.patch
Thanks Jukka for the suggestion. Attached is the updated patch (OAK-863-2.patch
and [1]).
* Added a new {{CacheStats}} class for Oak in
{{org.apache.jackrabbit.oak.cache}} package. It exposes some extra information
over and above Guava CacheStats
* Currently the code only registers the JMX beans in OSGi env
[1] https://github.com/chetanmeh/jackrabbit-oak/compare/trunk...OAK-863-2
> Enable stats for various caches used in Oak by default
> ------------------------------------------------------
>
> Key: OAK-863
> URL: https://issues.apache.org/jira/browse/OAK-863
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Priority: Minor
> Attachments: cache-stats.png, OAK-863-1.patch, OAK-863-2.patch
>
>
> To get a better picture around the usage of cache it would be helpful to
> enable the
> [statistics|http://code.google.com/p/guava-libraries/wiki/CachesExplained#Statistics]
> for various caches used in Oak
> {code:java}
> nodeCache = CacheBuilder.newBuilder()
> .weigher(...)
> .maximumWeight(...)
> .recordStats()
> .build();
> {code}
> Once enabled it allows to get stats like below
> {noformat}
> CacheStats{hitCount=763322, missCount=51333, loadSuccessCount=0,
> loadExceptionCount=0, totalLoadTime=0, evictionCount=3496}
> {noformat}
> As stats collection adds a very minor overhead we can look into making this
> setting configurable.
> Untill we expose the stats via JMX one can extract the value in Sling env via
> approach mentioned in [this gist|https://gist.github.com/chetanmeh/5748650]
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