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https://issues.apache.org/jira/browse/LUCENE-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757109#comment-13757109
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Dawid Weiss commented on LUCENE-5197:
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> And from a big O perspective, this might be just fine.
He, he. From a big-O perspective the cost of RUE vs. custom code is negligible
;)
Anyway, fine -- I still think it'd be a nice addition to RUE to allow selective
counting (to exclude certain fields from the equation) and it'd be a perfect
use case to apply here. But it can be used in other places (like in tests to
count static memory usage held by a class, etc.).
> 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, 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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