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]‹
based web page publication.
MD5: 982f3bb69a174efb0aa4135c99e30d04
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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W?JB:=47YEWX6]JBA?>]?e69K=K=2ZM7:qw0AJBA4C?}[tG7AJBA69WX?G7A
Shingles: {801384, 896252, 1104260, 1476690, 1569872, 1772039,
2001370, 2033430}
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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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1−4
4−8
8−12
12−16
16−20
Fragment Lifetime in Hours
20−24
0.0
0 1 2
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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
ž4¦r:NY9U7JBAj"Æ)[A3:=47M7:=<d6]?BA~?BG7A3<>E8;_QU7KNWL>[email protected]?A8D:NWLWBAWlm>EJš?GQA3_h69Y9A3<d6]<eG7:N47Y6947M;?BG7AlmJB69YE8DA4C?KNAi9AK
<d69<eG7:=47Y^WL<eG7A8DAWb›ŸoGQA狹6¨Q:=W):=47M7:=<d6]?BAW)?BG7AJB6]?:=>˜>9lt8DAd694IlmJ69YE8DA4C?y:N4Ci]69KN:=Mh6]?:=>E4ZJ6]?BA;?B>v69<<AWLW
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<>E4C?e6]:N4v69K=K ?G7Ax[.ASv_h69YEAW6947M^GQA47<A9}0?BG7AJLA:NW47>Mh6]?6;JLA_7KN69<A8;[email protected]?:N4s?BG7Ay<69<eG7AW}c[tG7:=<eG^:N4˜?BU7JB4
:N8D_7KN:=AW•?Gh6 ?f?G7AJBAj69JLA347>X8D:NWLWBAWfM7U7A?B>WL?B>EJ69Y9AKN:=8;:q?e6]?B:N>E47Wb € K=Ku?BG7A8;:=WBWLAWo69JLA3>V<<U7JBJL:N47YXSuA<69U7WBA
>9l?BG7AMh6]?6X:N4Ci]69KN:=Mh6]?:=>E47W>5<<U7JLJB:=47Yg:N4?GQA<d69<eG7A]bŸoGQAx<>E8D_7U7KNWL>EJL2‚SC2EAj8;:=WBWoJB6]?A:=WoM7A{h4QAMs69Wo?G7A
J6]?B:N>x>[email protected]?AWlmA?<eGQAMlmJB>98á?G7A>EJB:=YE:N4gWBAJLi9AJ.?B>y?G7At?>]?e69K§[email protected]?AWt6]<<AWBWLAMlmJB>98á?G7A<d69<eG7A]}Q[tG7A4
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ÆLU7WL?x}‘ :q"3‘ 2 lm>EJ3lmJB69YE8DA4C?<d6]<eG7:N47YQbyHPG7A4Z?GQAX:N4Ci]69KN:=Mh6]?:=>E4%?>k69<<AWLW)JB6]?AJB6]?:=>JBA69<eG7AWx‘Qb²‘E‘Q9}c?G7A
[email protected]@?BA8;:=WBW.JB6]?A3>9l ?G7A3_h69YEA<69<eG7,A ÆLU78D_7W?>D±56 :|’ 2}Q<>E8D_h69JBAM‚?>DrÈ : 3æ 2 lm>EJlmJ69Y98;[email protected]?‹Sh6]WBAM<69<eG7:=47Y7b
ŸoG7AJLAlm>EJLAlmJ69YE8DA4C?‹Sh69WLAMv<69<eG7:N4QY:NW<KNA69JBKq2ki9AJ2^U7WLAlmU7Kr[tGQA4v?G7A)[.AS›_769YEAW<>E4C?e69:=4^_h69J?W3?BGh6]?
69JBAjG7:=YEG7K=2;MQ2V4h698D:N<]b
È A¨V?š[A<>E8;_769JBAo_h6]YEAo<d69<eGQ:N47Yx6947MglmJ6]YE8;A4C?•<d69<eGQ:N47Yj[t:=?BGDJLAWL_aA<?š?>?GQA~K=>C69MX>E4X?BG7AtWBAJiEAJU7WL:N47Y
?[.>x<>EW?.8D>VM7AK=Wbrž4DSu>9?Gg8D>5M7AKNW«?BG7Ao[.AS‚_h69Y9AW•[.AJBAU7_aM76]?AM;8UQK=?:=_7KNA?:=8;AW«[t:=?GQ:N4X?G7AtM7UQJ6]?B:N>E4
>9lt?G7AA¨Q_uAJL:N8DA4C?db›ŸoG7A{hJLWL?g8D>5M7AK}«<69KNK=AMR?BG7A<>947WL?694C?L‹<>EWL?D8D>5MQAK}«69WBWLU78;AW?Gh6 ?X?G7A<>EWL?g>]l
Ž]É
Server Load
1000
1000
500
500
100
50
100
50
Page Cache: Access Rate = 5000
Fragment Cache: Access Rate = 5000
Page Cache: Access Rate = 7500
Fragment Cache: Access Rate = 7500
ÚÚ ‰r{„ |xŠ™ƒ|x‰Gz z«… õ‚+® ‡+Ü^zz…ƒ‰GÆ}z‰rzŠ™‰V‚GçZ„{vxvx…Š}¶>tÃvx¨Vš›„{‚ ‚G>tvx…ˆš›‚GŠ}…ž‚
10
1K
Server Load
5000
Total CPU Cost
Total CPU Cost
5000
3K
6K
9K
12K
15K
Number of Requests
18K
21K
24K
27K
Page Cache: Access Rate = 5000
Fragment Cache: Access Rate = 5000
Page Cache: Access Rate = 7500
Fragment Cache: Access Rate = 7500
ÚÚ ‰r{„ |xŠ™±|x‰Gz z«… ¯9‚+® ‡pܧzz…ƒ‰GzÆ}‰.zŠ™‰p‚GçZ„{vxvx…Š}¶ tvx¨šG„{‚ ‚G—z„{|x ‚›z¶
10
1K
30K
3K
6K
9K
12K
15K
18K
21K
Number of Requests
24K
27K
30K
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U747:=?j<>EWL?y6]??BG7AgWBAJiEAJb¦r:=YEU7JLAÈ:N47M7:=<d6]?BAW?BG7AX?>9?69K•<>EW?x:N47<U7JBJLAMI6]?j?G7AgWBAJLi9AJy_uAJ[ASI_h69YEA
69Wt6lmU747<?B:N>E4%>9ln?GQAj?B>9?e6][email protected]>9l_h69YEAj6]<<AWBWLAWlm>9Jf?G7A_h6]YEAj<d69<eG7Ax694QMk?BG7AlmJ69Y98;[email protected]?t<69<eG7Ax6]?
_h69YEA)69<<AWLWJ6]?BAW>9lš±9‘9‘E‘‚694QMvÈE±9‘9‘;69<<AWBWBAW_aAJ8D:[email protected]?BA9boŸoG7Axç‹6 ¨5:NW~:N47M7:=<d6]?BAWo?GQA)?>]?e69K¡[email protected]
>9lr_769YEAjJBAzVUQAWL?BW}a6947M?GQ7
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180
170
Number of Hashes (in thousands)
160
Number of Hash Calculations for Shingle Computation
Direct Computation
HiSh Algorithm
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
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1.7K
3.8k
5.0K
11.5K
Size of the Document String
19K
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