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https://issues.apache.org/jira/browse/LUCENE-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563685#comment-13563685
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Michael McCandless commented on LUCENE-4609:
--------------------------------------------
I had to change the PackedBytes.get to take a [reused] IntsRef in, else I was
hitting thread-safety issues (AIOOBE)...
base = trunk, comp = patch, index = full 6.6M Wikpedia English with 9 facet
dims counted:
{noformat}
Task QPS base StdDev QPS comp StdDev
Pct diff
HighTerm 7.30 (1.5%) 7.60 (1.6%)
4.1% ( 0% - 7%)
MedTerm 16.22 (0.7%) 17.25 (0.8%)
6.4% ( 4% - 7%)
LowTerm 37.87 (0.8%) 41.08 (0.4%)
8.5% ( 7% - 9%)
{noformat}
So we finally have something faster than dGap(vInt)!
But PackedInts takes ~2X the storage (base is 151208 KB, by summing DV on disk;
comp is 305889 KB by measuring RAM of the PackedInts structures).
> Write a PackedIntsEncoder/Decoder for facets
> --------------------------------------------
>
> Key: LUCENE-4609
> URL: https://issues.apache.org/jira/browse/LUCENE-4609
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Priority: Minor
> Attachments: LUCENE-4609.patch, LUCENE-4609.patch, LUCENE-4609.patch,
> LUCENE-4609.patch, LUCENE-4609.patch
>
>
> Today the facets API lets you write IntEncoder/Decoder to encode/decode the
> category ordinals. We have several such encoders, including VInt (default),
> and block encoders.
> It would be interesting to implement and benchmark a
> PackedIntsEncoder/Decoder, with potentially two variants: (1) receives
> bitsPerValue up front, when you e.g. know that you have a small taxonomy and
> the max value you can see and (2) one that decides for each doc on the
> optimal bitsPerValue, writes it as a header in the byte[] or something.
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