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https://issues.apache.org/jira/browse/LUCENE-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962717#comment-15962717
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Robert Muir commented on LUCENE-7774:
-------------------------------------

I think it would be better to speed up e.g. offlinesorter or whatever so that 
large amounts of ram are not necessary here?

> 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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