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https://issues.apache.org/jira/browse/LUCENE-6784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6784:
---------------------------------
    Attachment: LUCENE-6784.patch

Here is a patch. The default cache has a size of 32MB and I added a heuristic 
to only enable it if this would represent less than 5% of the total memory that 
is available to the JVM. If you think this heuristic is too complicated I can 
remove it...

> Enable query caching by default
> -------------------------------
>
>                 Key: LUCENE-6784
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6784
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 5.4
>
>         Attachments: LUCENE-6784.patch
>
>
> Now that our main queries have become immutable, I would like to revisit 
> enabling the query cache by default.



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