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https://issues.apache.org/jira/browse/JCR-1225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544421
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Ard Schrijvers commented on JCR-1225:
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Though, when nothing changed in any of the indexes, then the multiReader in
MultiIndex is still valid, and none of the readers are recreated. When a
document is added or deleted, a new multiReader is created by creating all
ReadOnlyIndexReaders again, but the SharedIndexReader a ReadOnlyIndexReader
depends on is reused when it did not change. Hence, as you explained in
JCR-1213, the readersByBase might still be the same. The only thing that must
be recreated every time is the 'deleted' BitSet, which I am not sure how long
it takes for *large* indexes.
You think it is possible to add reuse of the ReadOnlyIndexReaders?
> ReadOnlyIndexReaders are re-created on every access
> ---------------------------------------------------
>
> Key: JCR-1225
> URL: https://issues.apache.org/jira/browse/JCR-1225
> Project: Jackrabbit
> Issue Type: Improvement
> Components: query
> Reporter: Marcel Reutegger
> Priority: Minor
>
> AbstractIndex.getReadOnlyIndexReader() creates a new instance on every call.
> The returned index reader should instead be cached and kept open as long as
> there are no changes on the underlying index.
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