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Posted to oak-issues@jackrabbit.apache.org by "Alex Parvulescu (JIRA)" <ji...@apache.org> on 2016/11/22 09:49:58 UTC

[jira] [Resolved] (OAK-4967) Offload the node deduplication cache offheap partially

     [ https://issues.apache.org/jira/browse/OAK-4967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Parvulescu resolved OAK-4967.
----------------------------------
    Resolution: Later

closing for now as I don't have time to provide a patch. let's revisit this later if it turns out it's still needed.

> Offload the node deduplication cache offheap partially
> ------------------------------------------------------
>
>                 Key: OAK-4967
>                 URL: https://issues.apache.org/jira/browse/OAK-4967
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Alex Parvulescu
>              Labels: performance
>
> The node deduplication cache sits by default at {{8388608}} by default [0] which means it can grow up to {{1.6GB}} on its own. It would be interesting to look into offloading some it the items offheap by configuration, to reduce the effect a full compaction might have on a running instance (and possibly in general reduce the on-heap footprint).
> [0] https://github.com/apache/jackrabbit-oak/blob/trunk/oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/WriterCacheManager.java#L70



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