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https://issues.apache.org/jira/browse/OAK-2745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636767#comment-14636767
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Thomas Mueller commented on OAK-2745:
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Now the LIRS cache supports an eviction callback. That way, we can use
additional metrics to avoid persisting unnecessary entries (for example old
revisions for the root node).
> PersistentCache should rely on eviction callback to add entry to the
> persistent cache
> -------------------------------------------------------------------------------------
>
> Key: OAK-2745
> URL: https://issues.apache.org/jira/browse/OAK-2745
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: mongomk
> Reporter: Chetan Mehrotra
> Assignee: Thomas Mueller
> Labels: performance
> Fix For: 1.3.4
>
>
> Currently when PersistentCache is enabled then any put results in addition of
> the entry to in memory cache and also to the backing persistent cache. While
> adding the entry to the persistent cache there is slight overhead of
> serialization of the entry to be paid.
> To avoid such overheads at time of read/write to in memory cache it would be
> better to move the logic to separate thread. PersistentCache can make use of
> Guava cache eviction callback and then add the entry to the backend
> persistent store
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