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https://issues.apache.org/jira/browse/OAK-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142476#comment-15142476
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Thomas Mueller commented on OAK-3850:
-------------------------------------

I see the following statistics are useful (per map):

- Space usage (on disk)
- Hit rate on the persistent part. Currently a hit on the persistent part of 
the cache seems to be counted as a cache miss; only a hit on the in-memory part 
is considered a cache hit.

> Collect and expose Persistent Cache stats
> -----------------------------------------
>
>                 Key: OAK-3850
>                 URL: https://issues.apache.org/jira/browse/OAK-3850
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, documentmk
>            Reporter: Teodor Rosu
>            Assignee: Thomas Mueller
>             Fix For: 1.4
>
>         Attachments: OAK-3850-v0.patch, OAK-3850-v1.patch, 
> test-performance-v0.patch
>
>
> Expose persistent cache statistics ( see: [Guava 
> CacheStats|http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/CacheStats.html]
>  )



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