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https://issues.apache.org/jira/browse/LUCENE-4602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530913#comment-13530913
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Robert Muir commented on LUCENE-4602:
-------------------------------------
Nice improvement!
Shai: I don't think we should block progress in open source over your specific
customers back compat needs that go above and beyond lucene's back compat
promise.
Ultimately, thats something only you care about, and something your customers
pay you to solve.
> Use DocValues to store per-doc facet ord
> ----------------------------------------
>
> Key: LUCENE-4602
> URL: https://issues.apache.org/jira/browse/LUCENE-4602
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Attachments: LUCENE-4602.patch, LUCENE-4602.patch
>
>
> Spinoff from LUCENE-4600
> DocValues can be used to hold the byte[] encoding all facet ords for
> the document, instead of payloads. I made a hacked up approximation
> of in-RAM DV (see CachedCountingFacetsCollector in the patch) and the
> gains were somewhat surprisingly large:
> {noformat}
> Task QPS base StdDev QPS comp StdDev
> Pct diff
> HighTerm 0.53 (0.9%) 1.00 (2.5%)
> 87.3% ( 83% - 91%)
> LowTerm 7.59 (0.6%) 26.75 (12.9%)
> 252.6% ( 237% - 267%)
> MedTerm 3.35 (0.7%) 12.71 (9.0%)
> 279.8% ( 268% - 291%)
> {noformat}
> I didn't think payloads were THAT slow; I think it must be the advance
> implementation?
> We need to separately test on-disk DV to make sure it's at least
> on-par with payloads (but hopefully faster) and if so ... we should
> cutover facets to using DV.
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