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Posted to oak-issues@jackrabbit.apache.org by "Stefan Egli (JIRA)" <ji...@apache.org> on 2017/02/06 10:40:41 UTC
[jira] [Updated] (OAK-5589) GlobbingPathFilter constructor is
expensive
[ https://issues.apache.org/jira/browse/OAK-5589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stefan Egli updated OAK-5589:
-----------------------------
Fix Version/s: 1.8
1.7.0
> 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
>
>
> 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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