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https://issues.apache.org/jira/browse/LUCENE-5296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13811607#comment-13811607
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Michael McCandless commented on LUCENE-5296:
--------------------------------------------
The difference in RAM usage was tiny in my test: 139.9 MB for
Facet42DVF and 140.7 MB for DirectDVF. For smaller indices, or
indices w/ fewer facet fields, the difference could be bigger ...
Perf change:
{noformat}
Report after iter 19:
Task QPS base StdDev QPS comp StdDev
Pct diff
Respell 53.84 (3.1%) 51.27 (3.3%)
-4.8% ( -10% - 1%)
Fuzzy2 25.96 (1.9%) 24.90 (2.0%)
-4.1% ( -7% - 0%)
Fuzzy1 31.56 (2.2%) 31.29 (2.4%)
-0.9% ( -5% - 3%)
AndHighLow 60.74 (2.9%) 60.25 (2.7%)
-0.8% ( -6% - 5%)
OrNotHighLow 33.05 (4.0%) 33.25 (4.2%)
0.6% ( -7% - 9%)
LowSpanNear 7.54 (3.3%) 7.62 (3.7%)
1.1% ( -5% - 8%)
AndHighMed 17.44 (1.3%) 17.65 (1.1%)
1.2% ( -1% - 3%)
LowTerm 42.22 (2.4%) 42.83 (2.1%)
1.5% ( -3% - 6%)
MedSpanNear 19.07 (2.4%) 19.37 (2.4%)
1.6% ( -3% - 6%)
OrNotHighMed 20.66 (3.3%) 20.99 (3.6%)
1.6% ( -5% - 8%)
LowSloppyPhrase 25.21 (1.8%) 25.66 (1.9%)
1.8% ( -1% - 5%)
AndHighHigh 15.31 (1.4%) 15.60 (1.3%)
1.9% ( 0% - 4%)
LowPhrase 9.69 (5.4%) 9.89 (5.2%)
2.1% ( -8% - 13%)
Prefix3 15.75 (1.5%) 16.16 (1.6%)
2.6% ( 0% - 5%)
HighSpanNear 3.87 (3.0%) 3.99 (3.1%)
3.0% ( -2% - 9%)
MedPhrase 45.71 (3.4%) 47.19 (3.7%)
3.2% ( -3% - 10%)
MedSloppyPhrase 3.30 (6.2%) 3.42 (7.8%)
3.6% ( -9% - 18%)
HighTerm 10.69 (1.3%) 11.09 (1.4%)
3.7% ( 0% - 6%)
OrHighNotMed 9.07 (1.2%) 9.46 (1.7%)
4.3% ( 1% - 7%)
Wildcard 5.84 (1.1%) 6.15 (1.5%)
5.3% ( 2% - 8%)
HighSloppyPhrase 3.43 (8.0%) 3.62 (11.4%)
5.5% ( -12% - 27%)
MedTerm 15.65 (1.6%) 16.51 (2.0%)
5.5% ( 1% - 9%)
HighPhrase 3.14 (6.8%) 3.32 (6.9%)
5.5% ( -7% - 20%)
OrHighMed 7.25 (1.4%) 7.66 (1.8%)
5.7% ( 2% - 8%)
OrHighNotHigh 6.13 (1.8%) 6.50 (2.2%)
6.0% ( 1% - 10%)
OrHighNotLow 5.44 (1.3%) 5.82 (1.4%)
7.0% ( 4% - 9%)
OrNotHighHigh 12.42 (1.9%) 13.31 (2.3%)
7.2% ( 2% - 11%)
OrHighLow 3.83 (1.7%) 4.27 (2.1%)
11.4% ( 7% - 15%)
OrHighHigh 2.85 (1.7%) 3.23 (2.1%)
13.2% ( 9% - 17%)
IntNRQ 2.13 (1.5%) 2.50 (1.2%)
17.1% ( 14% - 20%)
{noformat}
I think we should remove Facet42DVF/Codec?
> Add DirectDocValuesFormat
> -------------------------
>
> Key: LUCENE-5296
> URL: https://issues.apache.org/jira/browse/LUCENE-5296
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.6, 5.0
>
> Attachments: LUCENE-5296.patch
>
>
> Indexes values to disk but at search time it loads/accesses the values via
> simple java arrays (i.e. no compression).
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