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https://issues.apache.org/jira/browse/LUCENE-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756456#comment-13756456
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Adrien Grand commented on LUCENE-5197:
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I was thinking about RamUsageEstimator but it has some pitfalls too I think.
For example, RAMInputStream has a link to RAMFile which in turns has a link to
the RAMDirectory. So every time you would run RamUsageEstimator on a format
producer, you would take into account the whole directory size?
> 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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