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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121410#comment-13121410
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Michael McCandless commented on LUCENE-3433:
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bq. SortedSource or rather its impls. are hairy and horribly inefficient during
merge.
Well let's address that ("remove SortedSource") under a different issue? I
don't think we should remove them here because it's unrelated (there are other
great simplifications here).
I'm all for simplifying, but not if we lose good functionality (cut into the
bone).
Loading everything into heap can be solved, but, I think is relatively low
priority because that's how the search app would use sorted DV at search time
anyway. Ie, an app sets this on their "country" field because they know they
want to sort by "country" at search time, and they will load the DV into RAM at
search time. We only hold this RAM allocated while we merge the one field,
then it's freed, so if multiple DV sort fields are used, merging takes less RAM
than searching. I think the merge RAM usage is relatively minor.
The SortedSource has a simple API (just like FC.DocTermsIndex): getOrd(int
docID), getValue(int ord). I don't see why this is adding complexity to DV.
> Random access non RAM resident IndexDocValues (CSF)
> ---------------------------------------------------
>
> Key: LUCENE-3433
> URL: https://issues.apache.org/jira/browse/LUCENE-3433
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Fix For: 4.0
>
> Attachments: LUCENE-3433.patch, LUCENE-3433.patch
>
>
> There should be a way to get specific IndexDocValues by going through the
> Directory rather than loading all of the values into memory.
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