[jira] [Updated] (OAK-2686) Persistent cache: log activity and timing data, and possible optimizations

["Michael Marth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-2686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Marth updated OAK-2686:
-------------------------------
    Labels: tooling  (was: )

> Persistent cache: log activity and timing data, and possible optimizations
> --------------------------------------------------------------------------
>
>                 Key: OAK-2686
>                 URL: https://issues.apache.org/jira/browse/OAK-2686
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>              Labels: tooling
>             Fix For: 1.3.0
>
>
> The persistent cache most likely reduce performance in some uses cases, but currently it's hard to find out if that's the case or not.
> Activity should be captured (and logged with debug level) if possible, for example writing, reading, writing in the foreground / background, opening and closing, switching the generation, moving entries from old to new generation.
> Adding entries to the cache could be completely decoupled from the foreground thread, if they are added to the persistent cache in a separate thread.
> It might be better to only write entries if they were accessed often. To do this, entries could be put in the persistent cache once they are evicted from the in-memory cache, instead of when they are added to the cache. If that's done, we would maintain some data (for example access count) on which we can filter.



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