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Posted to oak-issues@jackrabbit.apache.org by "Vikas Saurabh (JIRA)" <ji...@apache.org> on 2017/10/04 17:47:00 UTC

[jira] [Resolved] (OAK-3132) Reduce memory usage of OakIndexFile

     [ https://issues.apache.org/jira/browse/OAK-3132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vikas Saurabh resolved OAK-3132.
--------------------------------
    Resolution: Won't Do

Resolving as won't do (wanted to put something like 'no longer required').

> Reduce memory usage of OakIndexFile
> -----------------------------------
>
>                 Key: OAK-3132
>                 URL: https://issues.apache.org/jira/browse/OAK-3132
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: lucene
>            Reporter: Marcel Reutegger
>
> OakIndexFile splits an index file into Blob chunks and keeps one of the chunks in memory at a time. The chunk size is 32k by default but can be controlled with a property on the index definition.
> In a test repository I observed OakIndexFile instances consuming more than 600MB of heap, with a chunk size of 1MB. This seems quite high for a system where no query was active at that time.
> I think we should look into alternative ways to read from the Blob than just plain old InputStream. E.g. with a ByteChannel we could push the caching aspect to the Blob implementation, which could leverage an OS buffer cache.



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