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https://issues.apache.org/jira/browse/OAK-5589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Egli updated OAK-5589:
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Attachment: OAK-5589.patch
Attached [^OAK-5589.patch] with a suggestion for an improvement. With this
based on a simplistic benchmark some 25-30% performance gain was achieved.
[~mduerig] if you find time, can you please review? thx!
> GlobbingPathFilter constructor is expensive
> -------------------------------------------
>
> Key: OAK-5589
> URL: https://issues.apache.org/jira/browse/OAK-5589
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.6.0
> Reporter: Stefan Egli
> Assignee: Stefan Egli
> Fix For: 1.7.0, 1.8
>
> Attachments: OAK-5589.patch
>
>
> The [GlobbingPathFilter
> constructor|https://github.com/apache/jackrabbit-oak/blob/jackrabbit-oak-1.6.0/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/observation/filter/GlobbingPathFilter.java#L75]
> is doing an expensive {{ImmutableList.copyOf}} while traversing down a path
> as part of filtering. ImmutableList internally first creates a Builder with
> capacity 4 - thus frequently has to do an {{ObjectArrays.arraysCopyOf}}.
> Two things that can be improved here:
> * as suggested by [~mduerig] that [private
> constructor|https://github.com/apache/jackrabbit-oak/blob/jackrabbit-oak-1.6.0/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/observation/filter/GlobbingPathFilter.java#L74]
> - should not copy at all. Only the public constructors should. So the public
> constructors should be rewritten to reflect this.
> * {{ImmutableList.copyOf}} cannot be passed an initial capacity
> unfortunately. Perhaps there's an alternative for this though.
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