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https://issues.apache.org/jira/browse/OAK-7947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724965#comment-16724965
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Vikas Saurabh commented on OAK-7947:
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Attached a zip - [^lucene-index-open-access.zip] which contains:
* logging-directory.patch - a patch that adds a logging {{Directory}}
implementation
* open-close-dir-calls.txt - all calls that the patch logged for a 11G
damAssetLucene index (same one I listed above)
* open-dir-calls.txt - all calls to simply open the index
* close-dir-calls.txt - calls to close the index
I few things that were quite interesting:
* *All* index files were read although mostly only a few reads were incurred
* seek were only incurred on {{.tim}}, {{.tip}} and {{.cfs}} files - {{.cfs}}
files tended to be in 100MB range
* seeks in {{.tim}} and {{.cfs}} went backwards too - so they could require
opening input stream multiple times
* only a few reads occur even after a seek
(there could be other useful patterns to find as well)
> Lazy loading of Lucene index files startup
> ------------------------------------------
>
> Key: OAK-7947
> URL: https://issues.apache.org/jira/browse/OAK-7947
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene, query
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
> Attachments: OAK-7947.patch, lucene-index-open-access.zip
>
>
> Right now, all Lucene index binaries are loaded on startup (I think when the
> first query is run, to do cost calculation). This is a performance problem if
> the index files are large, and need to be downloaded from the data store.
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