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https://issues.apache.org/jira/browse/LUCENE-6101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237279#comment-14237279
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Robert Muir commented on LUCENE-6101:
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This is essentially an implementation detail of merging. I do not think we
should offer ram wasting options here, its name slow for a reason.
> Allow the SlowCompositeReaderWrapper and MultiDocValues to accept
> acceptableOverheadRatio for OrdinalMap
> --------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-6101
> URL: https://issues.apache.org/jira/browse/LUCENE-6101
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Joel Bernstein
> Priority: Minor
> Attachments: lucene-6101.patch
>
>
> There are use cases where it's useful to be able to trade off performance and
> memory when accessing top level DocValues ordinals.
> This issue adds methods to the SlowCompositeReaderWrapper and MultiDocValues
> that allow an acceptableOverheadRatio to be passed in and applied to the
> OrdinalMapping.
> If people are ok with this approach I will add tests and performance
> benchmarks.
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