Crawling a Country: Better Strategies than Breadth-First for Web Page Ordering Ricardo Baeza-Yates Carlos Castillo Center for Web Research Universidad de Chile Center for Web Research Universidad de Chile [email protected] [email protected] Mauricio Marin Andrea Rodriguez Center for Web Research Universidad de Magallanes Center for Web Research Universidad de Concepción [email protected] [email protected] ABSTRACT !"#$%!&'!() *+,$.-/%0!1%#2/34567,98'$7(:0 ' !4;/#.-/%0#<0='?>@A%BC/! >D. E2C #21%0!F0?-/G5IH JK 3! (L9#2%M.N%0!% /M;0.#MO7P7(LK*Q,;R%#NS /AST ,7%0#UO(*Q,V(WJ,AX0.0%0#X. %R4SK?%BKN%#$UYK.'<O'<A%B 0!5 *+<10<#0F()Z10[*Q,N!\X,10#N*+,!0 %#]U212^"-/$MO10%]0^!05_H X *+,`63EX#2E2%R-/%0!FX1a %6\%EO-\EX %01`0V60`' !O%#.#+#b10%2T #2?0F7%#2%05\*QF2AFL0!V#%! ' !`0XNMc%9O%&,.#2Ted'O %#' !?,.#% Lf:!%0gN.1%5 Categories and Subject Descriptors hV5 i25 jlk [email protected])qAnxw;uq0rtyz{tnL|~}z9urv)z92taeBE' %#F9()@-\ $ $)A $ 0GeLhO5 i25 <k mn4oqrsbt0uv)qAn w[uqr t0yztn4|}z2urvaz22t+K%%D%2(WM%29D @ N$.e$ General Terms ¡1%B.RfL()M%0R0¢:UA$%9 % Keywords *+,$.-/.R[20.#210%0!XA$EBR*+,0!7A%0 1. INTRODUCTION * ,$.-//-gM,9E#2 -/%3#2%0!`%0/?,% ( + *+,!R913SEX().-/%!X%0g9IF 7ASE (\!5N<ASEb(!F7%0#U2.#b%0#1.#() *+,M.pR2S\.%N,A %0SE2P.#(W*Q,M P. %p5 (=`-/ ,F`#.-/%03#^SEXd%0S7?( 0!RA0%"%BE^-/%0!N#$<K!B9#;R[,A.10X?0F%# I00!V-/J,AM#2.-/%03#.#[5^FV%0F`.() £_£_£¤2¥¥¦ Copyright is held by the author/owner(s). , May 10–14, 2005, Chiba, Japan. . .=*+,"-/Rp-/$1010SEX%F,0O#.-/%# p(L<*Q,;RM%0SE#10 X0K().-/%!.%0 §¨<© z9u$ªVqr«Q¬Ltn4|4ªvW|4u®tn4|®|Lv)¯.«_¯°4t±z^q0o\u.4z^²³z9¬ ±r t9ª)z9rtr zQn4z2v)u.pz2rvWnp´=n4v)uz&n4q0r^o@r z9z ¨ O12%BKP (`µKB!¶ Y%0#U(V0%¸·¹»º¼½!5¾@(F0 .3!"!"P",A1"º +g2¿ RI0%_0Y-/%0!]' 10#,AO10%0#"jN%+#2K()V`(W1=-/\k Àj6(6- %SEM%a#2\%D-Jg'5IµK%N0J%0\[!\ <( .ÁB1ÁB1@EBR30$?JF %`(W\#.-/%#2%!\8'10'I0 '/A%B/%5 Â;¨Ã tyz2¯^±ptn4yz_q2Az2rYuvGsbzAÄKt0nL|lt®²³z9¬Å±r t9ª)z9rBƯ ±q°;Ç]qo/u.4z"²³z9¬_¬6z2±qAsbz2¯`ÈpÉ4vW±«;)Ç_q¬:¯qAaz2uz ¨/Ê .-/%0! 0V*Q,"O,0R[XU9%B.RA-0%0!N0XgBE"%+ . :%0!BJk · e5:0I';-6J%3pU2'.#7O10S%1SE -Q +%!_^R b!B^g3#SË[%B Y.&12`E35D%+NN-EBR=!` $.-/.#] #SË[%9VR6%0#Q0M.]%0!%0¶ X%®O%0` %0<(=0F*Q,;5 2F0!K.%b#20A<<%0! ,BEY0VV0E %9#"10$V7. $+10SR %Y0F7-\E"KV' -JOV%Y0FgBE-$O!%0 %!!5 D%0.M(\' V-J S.#b,9E"`A.#+(/!B %0#F!/#'%R,01L%V*Q,V-/%0!K-J.%VT-/ *Q,7!LS(9-I610%%V,A1;0S41%Bp'15=22R KVA%B -JO%"%0M%!7%B%21V#.-/%03#%0!N%SE %0$-Ì!M%#Q-^0.3N'#.-/%03#%0!"ÍBN.' 3S(aE%!Í&(K0!`-0.3S.#9E®%p5_H?2R 0/\0<%0SE-EVd%#N%0-Î ÏKÐ;5 Ñ;¨ Ò 4zXtsbqAÉLn[u/qo:vWn4oqrsbtu.v)qAnqAnYu.4zX²lz2¬vW¯\´=nLvauzAÄ ¬:É4uXu.4znpÉLs"¬=z9rqo?°Lt0yz2¯`v)¯vWnp´=nLvauz ¨ @(:-JV#d0%0^>*Q,Y0!CMK3E90%0!V K0 %^Î ÏKÐ=R 0%O0J%21X,AL(*+,X0!I=%d%S<k Ó eR9#1J7#9E%0 !R%#`0%NF-/%!X2B\%03%#54*» -K# 7^S710%BF(/#9E2%O!O#.-/%03#.#() %BEN!3%^3/%Y%Y`Mg3 <*Q,Nd%5 K14%VLK#23O/$.#1%! AEF()6#.-/%2T 3#%0!N!?()Z07*+,^-/0Y!1 %B? .RA3%YS( -I#\%L#.-/%03#FB(90=g9%0.-/%70!R-JI'9#.-/%# 0'">D1,0CY%05H 70%91X,A7(/!V!.-/R S7-/6,A`%0$.%0!SE+A%B<^#2 -/%3#0+>@,AC %Md0'.R?NS-/<,AYA,Y]#2 -/%3#ÔG5 0<%7%0SE^KN%0PF-/%!7-/"A$ `1O(\0!ÁB1SDEBRp,0127^#10K0O. ' (:-/%0!25 7M%%B,01%0/(L?0A <0K() -/%! 4<?,A'J([1Ig9%0.-/.#!RB066?'62T 0%03/0%M(p$.-/%0!V'!10,00#` (G .5 @"2Ab%- '!-/S³,A$A(WM%0 %+0-JTg9%0.-/%&,2.#9Ted0'O%0#+ \f:!T %gM%05 @JA\' !\-/01K'.[%()M% %0#10$O-/%0!bB5&¿IE >D'.Cb-J .%X!,0f:!%gO%()M %`.10.#X(a³ 210/-/%!(L7K*+,p5 7%0U9/$%^12%/91\-gN%0K10,98'?( *+,+$.-/X%0#*Q,Q-/%!Y$.#1%!52%&i^#2T $,AFXA%0X`%0#"X-/%0!(a-Jg -JX1.#Y%"1<$UA$%95<2%jN%B9#1?0V! #%!' !R;-/0b V%Y'.#Y%b2%+B 5 LST %0SEBR42 % N%B 1<%10%O%#"#S$%0<() ()112<-gA5 2. PREVIOUS WORK * ,-/Q%B 0(F. $%0!%R %# + #2/%M0S/-/%0!!S/<g3/\,010%\T $5*»%!Yb01,00.#[R b^()% % A%BX$gQ( #X0O%BO0V() 2T #210%!V?-JgA5I0K<X%0%/,A1>@.%T !%0`0%0!CR[-/0b23%B<M.8'7. $b%0!%<() 10,%!X0/%0g9%0!`%#$.-/%0!M!S5 2.1 Web crawler architectures 97#2%0?(=-/ G%$2%0!.L#2 %T 10#^ÏK¿\2¢ k iÀ eR\0N*Q, Ê .-/k j eR\0*+#_*»#2 *+,]*Q k j2ºeR\0-/N(<D%B%MH/$+kSº .R 7A%0L"!%9<f=hK {k jjeR;%^.SE3%Y( µKB! -/$<kSº.i R9 Ê ,*+,Yk À R¡$..R0<9#9T 1<$.-/`k i·eR41XkSºjeR;V*+, 10%B%%%2T 4-/Ok i2ºeR0FfLSE¿J 04-/$Xk À.eRAX-/ 9#210N%B.#+%&*Q,ÏKH Ê ¢ k ·eRJ#2%BP# Î ,0-/FkSº.¼ R20?-//(p0 9H<®.%0!%Xk 9º$R 7*»DÏ ¢-/`k L-/0^-\ 10.#() 0?.%# <%\-/Ok i e5 @%¸##S%»&0ASd-/%! $1'# ,A 3R=0N !%0-/M0S$1`%QST 1R[%1#%! =-/F0S$1X,BE Ê 0"k À9º %#`<!%0$0$.-/J0S$1?#$,A#X,BE Ê 0gB,0 kSº.Ó e 5 L%SEBR0<-/?..#Y1%#$\0V µ KÎ 01,0 %F%1#2FÐ4,%+k jeR0*+,¿Jk ÀÓ.:%0#h<K <!Yk À e5 ¿I#V0S$1610RL'1#F,A127*Q,-/%! 0.3J(WB10.#X%X0 k ÀBºR9À eR9#2EO%#V%B( $.-/<()<*+,YSX#%0' `k j2Rpi9R6ºR[j3¼ Rp'T %!V%B%BJ,A0%#X() WM>D0##%C<-, ?k ¼ R#2%0! S<k ÀieR2g30%0!70\(a0%\([0?. $N%0!%0?BE !k i¼2RÀ¼9RÀ9R0 eR9(WB10.#N-/%!k i3ÓBRpº·2R2jBÀBRÀ·2R2j3i p%# *+,$3?BA$%&kSº ÀBRj·e5 2.2 Web crawling ordering Ê "$\ ?k ÀÀ.LM#2K0 d0'?'1#9EM%^A/(WK$.-/ST %!b0.#210%0!25_0SN#0 $`-\M]º·¼2R ¼¼¼T0!-/ (ax !#"%$'&#"#(_#2M%;RJ%]-/0"-/%!Q`T 1%¸-\"#%-/S #SË[%B'!5 0+#%! X'.#Q-^,2.#9Ted0'.R6,0g2%0gBT10%B`%#] T ;f:!%gAR2-/$ U20%0#N$\%N5JK%0 (A\%10%I-=6S([0\-/6-\%9=F#.-/%# !=-/S0!`f:!$%0gO.SE`#1%! 0\$.-/%0!F2BR 0%X0\0Af:!%0gO'!E6\,A.R3() -J.#M,9E ,#22Ted0'6%0#X,$g9%0gBT1%B.5LhK.-J3.R31I (WI8D10'?X%!V#M%p5 <.8'g%#»*»%]k jB VA().#%l10F-/V% i3À·`%!R010%0!O,.#2Ted'/#$%!5I0$EN()1%# V,2.#9Ted0'7$.-/6.1V0!7-/b0!+f:!T %gOSE`%`0\$.-/GR9,1=0EX##X%J2:70 S/`/'!5 H ,S,A1:$I k i;#!%0.#M7-/%0!V'!E,.#% %!S0 ..#b<f6 Ê K%2T@%0Vf:!VDA%0 Ê `T 012% $5]D%<f6 Ê R=._!^!3%®%_%0S/10 ( >D0C\-/F4#2',1.#<.ÁB10SE7%0!60!4SpA%B 5J@? ?f:!%g012%;R0,1?S /(G' %0#X6#%L8'1'I%`%0/';5:H %<f6 Ê TD#93%X$.-/J#.-/%2T 3#d'0"0!^%¸b$.-/%0!]()%B$^-/S!0$ 10%B\(F>@.C5/¢:U2A%B-F. .#^%Yº.¼¼2R ¼¼¼T !F'E2%B0`!+-/S&A.-$T@- #',01%Q(\%2T %0g956hK.-.RK-/%0` %-/S^0/' T !?%0?U2A%B%0K[*Q,;5 ¿Ja#2F$F QkSºº$\10#+X10 %&%&1,0V(/0`*+, (Kj3¼%®!`()x0) $+*M%®%0#¸º¼¼% !6(){/*+,¿J?-/eRB'%!F,.#2Ted'J!3%' %0# #2%0!%0#%b%0%B<' !EB570O-/%%0%0! '!E-\,#22Ted0'.R91!F%#¾#%!X A().#12%0!E-G5?K%0F2,0Z//F*+,T ¿7-/p\,0.#NV0<-/?10#MO!3/0K#095 0$EX<0.-#V =f:!%gF.1a %06. #O%O T :1,0!0 (IF*+,Y!3O,#Y02.UM %Y(60 $1pf:!%g105 00AM0%BX1SN2%B.#]%lkS,º ?Í -/0b%1#O%1 %(O$.-/%0!'!F% 0 Ê 0.%*+,2Í`,BEM0%0!F-/#/%!7(:'! %"!N#0 N%#&,BE&%01#2%0!"N%_%E2R A%0!?'!L-/0O1I'.9%()M %pR;- \ -7%#G¶ .<%0<10%;5 3. METHODOLOGY *QJ#.-/%0##O10,L(006*Q,V!0/GJ10%2T EM#2M%6O.3#,0%!V -/.#N#0 61%0!O7*+, -/.R0%#`%MO10##2Ë[$%B'!5ID%0JT %;RA-`#2d%70VA%O$V%#^0V-/%!^ T 0S125 3.1 Page importance metric: Pagerank K1/!3L?#2.-/%03#>DA%9C0!?d'.5I*+710 0 f:!%g`<F$?(pA%0/(;*Q,!5 0 f:!%g!S0{-\J%B9#210.#`,BE`f:!`$6\k j3Ó eR %0#b0F13#2d%%+'%!^%+0O$< >'^0!`-/+0!&f:!%0gX0!`(W%0.#b,9EM%9E !/-/S^0!^f:!%g9C5 4V.1 Kf:!%0gAR2.M!K%0/*Q,M9#2T .#" 'F%`'E'^RA%0#^.YBE2A%g<X%0ST %&,A@-%+D-JY'5^0Mf:!%g+10(?^!M 02,0,0SDE+(?,A%0!Y%&^!%&!-/0%QV'E2' .$S`'%0E_'5HÌ!B9#®00X()M10%0#T '%0#%0!^OF^0%0g%+F( >@%#2 1()CR6 A%X-/079S60!J =%#2^R%0#O10A%9<.$ !R0B:%F1!%0!?%gK10%S(WSEF 4%#»()0 %0g97%0F!5X0`f:!$%0g(0!X<O(a% (:K0K%#2Ì1()?A%#2/?.$^0!5 h .-3$.R01;*+,N!0/%010#KM%BEM!\-/S%0 1T%0g9R-/$O67>@%0g7%0g9C<L0E71X1a I%0g ,17%3<#',012XS<0<!5XH R;-V-1#b%0 g3 !JO10X1/%0g9%0!2R9,BE%0%0!`A(4S YQM!5 0M0^.%R/'M(7^`T %B%I(Lf:!%0g#0#Q>%#2¸8'10C<() E 0!FX40! %N0<%pR%1#2%!`SS(D5 @%+7(\0`%0# 12(WV9#2GRL-M.%Q' -/%0B%!Å0%U9®'pRN0%0# 1(W$S 0B+!%# ()Ô^$%»-/®,T ,0SDE R47$B7N(W.-¾%0g^() 0O1%9<! -/SY2,,0SDE+º 5\0K/079#410#(W<.10T %!7f:!%gV%O$RB%#OS==#,A.#X,BE706(W.-/%0! Á910%; %& (' 'º, 'º ) *"+ (' ) "! #$ -/,x70O%21X,AK(\0!F%0O%;R6%0#" 0 [email protected],A@-%¼95ºK%0#¼95 À W-JK10#N¼95º # $R ,0.#_%_0S.?2#2%05f:!%0g]Mb!,eR' 17(6ÁB1SDEN(6O*Q,!R03ENc%B?%\( 012%QR:XSX%0SE+F",AM.1a .#&% %0#U2%0!X7%#N/$K1.#NA.#2E?ÁB1EM5 F <f:!%0gY.%,AVM1SEYM%10#Y%# %(GJ?/010%0#6J%J([*+,!I.# ASd.SE()J/,98'3?(p#29%0!70/ 3%0g9%0! ()10%%k iie5Jf:!$%0g,BEMSS(L%0%\,A 10.#NI0K%0SE ÁB10SDEFJ%F.9*Q,VpRB%#FI9#Sd. %0L /!S0{.%`,A/M#J<.#210\$=([1% k e5H?R0f:!$%0gN!B\<0!ÁB1SDEM0!? 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Larger-sites-first 0 1 2 3 Day of crawling 4 1/v)yÉ4r z ? 2 VÉ:sÉ4)t0u.vaAz à t0yz9r tn4« 5 à } ;t0nL|³±3É:s"ÉL)t uv)AzOor t±uv)qAn"qoL|4q;±3ÉLsbz2n;u.¯ 5Nq;±3¯ ¨ ;qo4t0n^t±u.Épt[±r t9ª q0ou.4 z |4q[sbt0vWnÌÉL¯.vWn4yÅuªVqůur t0uz9yAvaz¯ 2 \tnL | ¨ !9L#$LS(0E<.%0%L,AJ#.-/%0##F(W'.5L*+I.10# f:!$%0g(OK0!%0"%¸-/0% $.-/%0!<-=0.#V%0#F%O1#V -_O10V(0 :f:!%0g- 3.#Y#21%0!`,0p5/710S F0.-/%% L!12V95 ¿IF-/%!/'!:6c%B4%<$;(#.-/%03#2T %!F/10,?!J.SEBRB,1 B$$W@$ 64I(W'% ,A»#.-/%#2%!]#B1%BM%0##.-/%0#%!]f:!$%0gA5 '!E&>D.3CV3AM0*Q,S6(WJ0?#0#2 %#%#0/(:0<-/G5 6. º.¼¼%]!FÍB3E+!%9%0R=%0%0/#2M%R %0#`1,0I(;0\*Q,;5:D%M7!T.<$%!F(p,0ST %0K(I!R;g3%0!NN."(I*+,Y!<%"M%"`T E]`A,R\%#&g3%0!b.]( *Q,]S!B ,AF3EU2A%035\D%V.R[10%0!'.:%()M T %F!1a#2? $.-/A!9I,A F!B9#S% ?O.3# #.-/%#2%!!/%%0#Ì#$.5 K%0?M%%!XA%2,0 \.-»X 0 c%0E(=-/50 0?,A%#%<(W 71T %04 3$0.#(6#2SË[%B\(WB1.#-/%0!' !Ok jieR ,0120"#2 -/%3#2%0!]9#1N,A%U20SE®()12.5 07UR[<K%0<%010!"#d0%0ON.1O(I,9E9 #.-/%#2.#»A%0#»%#¸¡,(V,%0#2-/#2;R/(W '%0#0 #P.#®f Ê %d0!1 % µKh PY%0#_Ï H<¡ $5:*+^ %0.#MV'%#0 #P.#M\(4S/%#M7d0U2.#'%0#0#.R -/0^%0/%E.-/ X0<-/?%0K7MT 0%0R,012?`-/S^U$EM<7%0%9@EB5 Acknowledgments *Q"$g9% -/.#2!Y0Y10A(70¡%0%1 2%BSd D%Sa 3K10!^µ %9\fI¼9ºT@¼3À T &(6¡#0%;5:*QK0%0g ¢:()0?¢=(a0#2\(aÌÎK%[5L(:*&0%0!%N(W?0K%ST p.#\()/0Vµ g#2M%;5 7. 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