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https://issues.apache.org/jira/browse/LUCENENET-634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shad Storhaug resolved LUCENENET-634.
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Resolution: Resolved
The ConcurentHashSet was brought into Lucene.Net.Support and made internal.
Adding a dependency was possible, but the project isn't strong named so there
was a warning, but we were also able to use it in more places by implementing
{{ISet<T>}} and adding a working {{UnionWith}} implementation.
> Investigate using alternative ConcurrrentHashSet implementation
> ---------------------------------------------------------------
>
> Key: LUCENENET-634
> URL: https://issues.apache.org/jira/browse/LUCENENET-634
> Project: Lucene.Net
> Issue Type: Task
> Components: Lucene.Net Core
> Affects Versions: Lucene.Net 4.8.0
> Reporter: Shad Storhaug
> Priority: Minor
> Labels: performance, up-for-grabs
>
> There is a lower level implementation of ConcurrentHashSet available on NuGet
> that supports all of our target platforms:
> https://github.com/i3arnon/ConcurrentHashSet/blob/master/src/ConcurrentHashSet/ConcurrentHashSet.cs
> The only limitation is that it does not actually implement {{ISet<T>}}. I
> don't believe that will be a problem, though. But, since this collection is
> used directly in {{IndexReader}} it is worth looking into.
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