[jira] [Resolved] (LUCENE-5122) DiskDV probably shouldnt use BlockPackedReader for SortedDV doc-to-ord

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir resolved LUCENE-5122.
---------------------------------

    Resolution: Won't Fix

I couldnt get any improvement out of this patch in benchmarks. 

If someone does, let me know and we can reopen.
                
> DiskDV probably shouldnt use BlockPackedReader for SortedDV doc-to-ord
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-5122
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5122
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>         Attachments: LUCENE-5122.patch
>
>
> I dont think "blocking" provides any benefit here in general. we can assume the ordinals are essentially random and since SortedDV is single-valued, its probably better to just use the simpler packedints directly? 
> I guess the only case where it would help is if you sorted your segments by that DV field. But that seems kinda wierd/esoteric to sort your index by a deref'ed string value, e.g. I don't think its even supported by SortingMP.
> For the SortedSet "ord stream", this can exceed 2B values so for now I think it should stay as blockpackedreader. but it could use a large blocksize...

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