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https://issues.apache.org/jira/browse/LUCENE-5119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713414#comment-13713414
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Adrien Grand commented on LUCENE-5119:
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David, I think your use-case would still work pretty well with this change. In
particular, if you had enough memory to store your ordinals mapping in memory,
this means that the file-system cache will likely be able to cache the whole
ordinals mapping as well (you may just need to decrease a little the amount of
memory given the the JVM) so random access should remain fast?
> 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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