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https://issues.apache.org/jira/browse/LUCENE-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756552#comment-13756552
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Michael McCandless commented on LUCENE-5197:
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This would be a great addition!  And I agree if we can somehow do this with 
RUE, being able to restrict where it's allowed to "crawl", that would be nice.

Separately, I wonder if we could get a breakdown of the RAM usage ... sort of 
like Explanation, which returns both the value and a String (English) 
description of how the value was computed.  But this can come later ... just a 
ramBytesUsed returning long is a great start.
                
> Add a method to SegmentReader to get the current index heap memory size
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-5197
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5197
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/codecs, core/index
>            Reporter: Areek Zillur
>         Attachments: LUCENE-5197.patch
>
>
> It would be useful to at least estimate the index heap size being used by 
> Lucene. Ideally a method exposing this information at the SegmentReader level.

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