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Posted to oak-issues@jackrabbit.apache.org by "Chetan Mehrotra (JIRA)" <ji...@apache.org> on 2016/11/03 14:24:59 UTC
[jira] [Commented] (OAK-2686) Persistent cache: log activity and
timing data, and possible optimizations
[ https://issues.apache.org/jira/browse/OAK-2686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15632857#comment-15632857 ]
Chetan Mehrotra commented on OAK-2686:
--------------------------------------
[~tmueller] [~tomek.rekawek] Should this be closed now as we are capturing various stats related to persisted cache now
> 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
>
> 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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