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https://issues.apache.org/jira/browse/LUCENE-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward resolved LUCENE-7774.
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Resolution: Won't Fix
> Allow BKDWriter buffer sizes to be configurable
> -----------------------------------------------
>
> Key: LUCENE-7774
> URL: https://issues.apache.org/jira/browse/LUCENE-7774
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
>
> BKDWriter has a 16Mb internal buffer it uses for sorting points, which then
> spills over to on-disk sorting if there are too many values. The difference
> in performance between in-buffer and on-disk sorting is pretty stark, and it
> would be nice to make this buffer size configurable so that users can choose
> to use more RAM during indexing to speed things up.
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