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https://issues.apache.org/jira/browse/LUCENE-5911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172338#comment-14172338
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Robert Muir commented on LUCENE-5911:
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David: you are right.
This caching is unnecessary in my opinion.
Instead if the optional freeze() method is supposed to prepare internal
structures for querying, I would have freeze() just prebuild, populate an
ArrayList<NumericDocValues> (indexed by field number), by calling
getNormValues() for each one. If you don't call freeze, this list is null, and
it just returns a new one each time: not worth caching or anything for that
case.
> Make MemoryIndex thread-safe for queries
> ----------------------------------------
>
> Key: LUCENE-5911
> URL: https://issues.apache.org/jira/browse/LUCENE-5911
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Minor
> Fix For: 5.0, Trunk
>
> Attachments: LUCENE-5911.patch, LUCENE-5911.patch
>
>
> We want to be able to run multiple queries at once over a MemoryIndex in
> luwak (see
> https://github.com/flaxsearch/luwak/commit/49a8fba5764020c2f0e4dc29d80d93abb0231191),
> but this isn't possible with the current implementation. However, looking
> at the code, it seems that it would be relatively simple to make MemoryIndex
> thread-safe for reads/queries.
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