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https://issues.apache.org/jira/browse/LUCENE-5119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713611#comment-13713611
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Michael McCandless commented on LUCENE-5119:
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+1 to move ords to disk.
> DiskDV SortedDocValues shouldnt hold doc-to-ord in heap memory
> --------------------------------------------------------------
>
> Key: LUCENE-5119
> URL: https://issues.apache.org/jira/browse/LUCENE-5119
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-5119.patch
>
>
> These are accessed sequentially when e.g. faceting, and can be a fairly large
> amount of data (based on # of docs and # of unique terms).
> I think this was done so that conceptually "random" access to a specific
> docid would be faster than eg. stored fields, but I think we should instead
> target the DV datastructures towards real use cases
> (faceting,sorting,grouping,...)
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