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https://issues.apache.org/jira/browse/LUCENE-7237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15252385#comment-15252385
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Adrien Grand commented on LUCENE-7237:
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For the record, there is already a test for concurrency in TestLRUQueryCache.
> LRUQueryCache should rather not cache than wait on a lock
> ---------------------------------------------------------
>
> Key: LUCENE-7237
> URL: https://issues.apache.org/jira/browse/LUCENE-7237
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7237.patch
>
>
> This is an idea Robert just mentioned to me: currently the cache is using a
> lock to keep various data-structures in sync. It is a pity that you might
> have contention because of caching. So something we could do would be to not
> cache when the lock is already taken.
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