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https://issues.apache.org/jira/browse/OAK-7947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725067#comment-16725067
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Thomas Mueller commented on OAK-7947:
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Thanks [~catholicon]! I attached a new patch,
[OAK-7947_v2.patch|https://issues.apache.org/jira/secure/attachment/12952362/OAK-7947_v2.patch]
that contains the changes that are needed and make sense:
* IndexTracker.java: now checks that there is a child node ":index-definition".
So for a new index, it should now not return the definition.
* LucenePropertyIndex: returns LazyLuceneIndexNode instead of LuceneIndexNode.
This is needed, otherwise acquireIndexNode() is called even if getIndexNode
isn't called. (And acquireIndexNode downloads the index binaries.)
* OakStreamingIndexFile: A simple change to log the directory name as well.
(Not strictly needed, but very useful).
* FulltextIndexPlanner: Only call getNumDocs() if the index definition doesn't
contain a property "entryCount". (Not strictly needed, but should reduce reads).
> 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, OAK-7947_v2.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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