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https://issues.apache.org/jira/browse/LUCENE-4892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Adrien Grand resolved LUCENE-4892.
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Resolution: Won't Fix
I was hoping that the smaller memory footprint might make it comparable to
FixedBitSet in speed in spite of the higher overhead, but apparently it is not
enough:
{noformat}
TaskQPS baseline StdDev QPS patch StdDev
Pct diff
HighTermMonthSort 1221.82 (8.7%) 738.86 (3.4%)
-39.5% ( -47% - -30%)
IntNRQ 126.95 (4.5%) 78.65 (1.4%)
-38.0% ( -42% - -33%)
Prefix3 464.10 (2.5%) 331.94 (1.4%)
-28.5% ( -31% - -25%)
HighTerm 572.63 (1.4%) 416.42 (0.7%)
-27.3% ( -28% - -25%)
HighTermDayOfYearSort 324.51 (1.9%) 241.01 (1.4%)
-25.7% ( -28% - -22%)
OrHighLow 511.62 (1.0%) 387.64 (0.5%)
-24.2% ( -25% - -22%)
MedTerm 1609.19 (1.8%) 1225.70 (0.9%)
-23.8% ( -26% - -21%)
OrHighHigh 144.60 (5.0%) 118.70 (2.9%)
-17.9% ( -24% - -10%)
OrHighMed 421.88 (4.0%) 349.80 (2.7%)
-17.1% ( -22% - -10%)
LowTerm 3987.51 (6.4%) 3503.75 (3.5%)
-12.1% ( -20% - -2%)
Wildcard 241.67 (2.9%) 216.89 (1.7%)
-10.3% ( -14% - -5%)
HighPhrase 178.98 (3.9%) 165.85 (3.8%)
-7.3% ( -14% - 0%)
HighSpanNear 144.91 (2.7%) 134.36 (2.6%)
-7.3% ( -12% - -2%)
AndHighHigh 214.80 (1.0%) 199.49 (1.2%)
-7.1% ( -9% - -4%)
HighSloppyPhrase 249.43 (3.5%) 232.35 (3.4%)
-6.8% ( -13% - 0%)
Fuzzy1 159.45 (2.0%) 149.14 (2.6%)
-6.5% ( -10% - -1%)
MedPhrase 175.70 (2.6%) 165.17 (2.5%)
-6.0% ( -10% - 0%)
MedSpanNear 645.69 (3.0%) 609.97 (2.7%)
-5.5% ( -10% - 0%)
MedSloppyPhrase 144.37 (2.5%) 136.76 (2.6%)
-5.3% ( -10% - 0%)
LowPhrase 285.30 (2.5%) 270.93 (2.8%)
-5.0% ( -10% - 0%)
LowSloppyPhrase 398.34 (1.9%) 383.09 (2.0%)
-3.8% ( -7% - 0%)
LowSpanNear 517.04 (1.4%) 506.96 (1.4%)
-1.9% ( -4% - 0%)
AndHighMed 1090.21 (4.2%) 1077.55 (4.1%)
-1.2% ( -9% - 7%)
Respell 171.53 (2.8%) 171.52 (2.1%)
-0.0% ( -4% - 5%)
AndHighLow 1346.57 (2.4%) 1367.21 (1.9%)
1.5% ( -2% - 5%)
Fuzzy2 65.94 (8.6%) 67.84 (11.5%)
2.9% ( -15% - 25%)
{noformat}
> Create a compressed LiveDocsFormat
> ----------------------------------
>
> Key: LUCENE-4892
> URL: https://issues.apache.org/jira/browse/LUCENE-4892
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Adrien Grand
> Priority: Trivial
> Labels: gsoc2014
> Attachments: LUCENE-4892.patch
>
>
> There are lots of use-cases where the number of deleted documents is low.
> This makes live docs very dense and I think it would be interesting to study
> the impact of some bitmap compression techniques on performance (intuitively
> I imagine it will be slower, but since it would make data smaller maybe CPU
> caches could help us so I'd be curious to see how it would behave). This
> format would make a good addition to our CheapBastardCodec.
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