Automatic Fragment Detection in Dynamic Web Pages and Its Impact on Caching

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Fragment based publishing of web pages improves the scalability of
web services. In this paper we provide efficient techniques to
Gh6]WBGI?BG7JB>9U7YEGI694IA¨Q698;_QKNAg>9l?[.>sWL?JL:N47Y9Wb
automatically detect fragments in web pages. We believe that
automating fragment detection is crucial for the success of fragment
ŸoG7Ak{hJBW?6]47M ?BG7AsWLA<>E47MW?JB:=47YEWg:N4 ¦r:=Y]‹
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U7JLA ¾ 69JBA.AWBWLA4C?:N69KNKq2)?BG7AoW6]8;AfW?JL:N47YEW[t:=?G
Shingles: {801384, 896252, 1104260, 1329558, 1476690, 1569872,
1772039, 2001370}
WL8‚69K=K˜_uAJ?U7JLSh6]?:=>E47W » ?BG7A°_a>9JL?:=>E47Wœ?BGh6]?
Fragment based publishing of web pages improves the efficiency of
web services. In this paper we provide scalable techniques for
M7:qw0AJ):=4›?BG7A;?[>^W?JB:=47YEWxGh6diEASuAA4OG7:=YEG5‹
automatic detection of fragments in web pages.We believe that
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Shingles: {801384, 896252, 1104260, 1476690, 1569872, 1772039,
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String B
String C
Automatic Detection of Fragments in Websites
Overlap
Shingles of String B
Shingles of Overlap
Shingles of String C
{300, 434 1093, 2764} {193, 243, 1432, 3456 } {104, 470, 1956, 3464}
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Fragment Lifetime Distribution
55
ChildChangeThreshold = 0.7
ChildChangeThreshold = 0.5
50
CDF Characteristics of Fragment Lifetimes
0.9
45
0.8
40
0.7
Fraction of Fragments
Number of Fragments
1.0
35
30
25
20
0.6
0.5
0.4
0.3
15
0.2
10
0.1
5
0
< 1/12
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4−8
8−12
12−16
16−20
Fragment Lifetime in Hours
20−24
0.0
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ChildChangeThreshold = 0.7
4
6
8
10
12
14
16
18
Lifetime in Hours
20
22
24
26
28
30
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4.0
3.5
Disk Space Requirements
Bytes Transfered between Server and Cache
5M
Page Caching
Fragment Caching: MinMatchFactor = 0.9
Fragment Caching: MinMatchFactor = 0.7
Compulsory Miss Rate
100
Page Caching
Fragment Caching
90
Size of Disk Space (MB)
2.5
2.0
1.5
1.0
1M
70
500K
Miss Rate
Bytes Transfered Per Page
80
3.0
ڜV„{z|xÙ ±ˆ‰G„{z ‰Gz« å ®z… Œ‚ v}‚GŠ}wfܧ‚›v}‰rŠ™|}z
10
20
30
40
50
Total Number of Pages
60
70
75
50
40
100K
30
50K
Page Cache: Access Rate = 5000
Fragment Cache: Access Rate = 5000
Page Cache: Access Rate = 7500
Fragment Cache: Access Rate = 7500
0.5
0.0
0
60
20
10
1»Ú z„{|x‚Û¨ƒ‰rzz z…«9­ Ü^® z‰G’Æ}Ï z‚›‰VzŠ}šp…±ŒÍ¶‰.Š}t…±Š}š›Žr~Äzƒ‰Gz ‰Gz¶
10K
1K
3K
6K
9K
12K
15K
18K
Number of Requests
21K
24K
27K
30K
ڔ„{„y|xšGƒš›‰Gzzš « æ ® tvx€M±wyš›v}‰GÏ’Ï ‚›zš
0
.00001
.00002
.0001
.0002
.001
.002
.01
Invalidation Rate/Access Rate
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