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https://issues.apache.org/jira/browse/LUCENE-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488660#comment-13488660
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Simon Willnauer commented on LUCENE-4515:
-----------------------------------------

bq. It should definitely be experimental. Tomorrow we might decide its cleaner 
to encode this with RAMFile or something.
wait it's package private not protected so no need to annotate this really. We 
can change as we want.


                
> Make MemoryIndex more memory efficient
> --------------------------------------
>
>                 Key: LUCENE-4515
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4515
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/other
>    Affects Versions: 4.0, 4.1, 5.0
>            Reporter: Simon Willnauer
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4515.patch, LUCENE-4515.patch
>
>
> Currently MemoryIndex uses BytesRef objects to represent terms and holds an 
> int[] per term per field to represent postings. For highlighting this creates 
> a ton of objects for each search that 1. need to be GCed and 2. can't be 
> reused.

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