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(C$;-’’ 0/;$-,2%F N-%*I2*/# *$,-%* 2% /#$0$ 0D0/$,0 Zb\4 Za\= A#$ <’()* 2%?;-0/;)</);$ -0 -% -’/$;%-/2C$ /( *$*2<-/$* 0$;C$;0 0$/0 ()/ /( ,$$/ /#$ <#-’’$%F$ ND *D%-,2<-’’D <(,>(02%F -%* (>/2,2T2%F /#$ %$$*$* 0$;C2<$0 -/ ;$*)<$* <(0/0= R); <(%/;2N)/2(%0 2% /#20 0/)*D -;$ -0 ?(’’(I0= 9(3/24 I$ 2%C$0/2F-/$ ND 0(’2* /#$(;$/2<-’ -%-’D020 /#$ $K)2S ’2N;2), *$,-%* ?(; 0/;$-,2%F 0$;C$; <->-<2/D 2% - 1(+ ->S >’2<-/2(% I2/# ,)’/2>’$ C2*$( <#-%%$’0= "$ 2%/;(*)<$ - %$I K)$)$2%F %$/I(;M ,(*$’ /( <#-;-</$;2T$ /#$ *D%-,2< C2$I2%F N$#-C2(;0 (? 1(+ )0$;04 -%* *$;2C$ /#$ 0$;C$; <->-<2/D %$$*$* /( 0)>>(;/ 0,((/# >’-DN-<M 2% /#$ <#-%%$’0= 5(/# <’2$%/S0$;C$; 1(+ -%* VdV 1(+ -;$ 2%C$0/2F-/$*4 I#2<# -;$ /#$ /I( ,(0/ 2011 31st International Conference on Distributed Computing Systems 1063-6927/11 $26.00 © 2011 IEEE DOI 10.1109/ICDCS.2011.50 268

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2011 31st International Conference on Distributed Computing Systems

1063­6927/11 $26.00 © 2011 IEEE

DOI 10.1109/ICDCS.2011.50

268

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Z[b\ += ")4 3= 62)4 -%* G= "=Q(004 l9)$)2%F P$/I(;M .(*$'0 ?(; .)'/2S&#-%%$' VdV 62C$ @/;$-,2%F @D0/$,04m 2% H3#*+ #7 =OOO =>9L!L&4d``i=

Z[a\ Q= G),-;4 3= 62)4 -%* G= Q(004 l@/(<#-0/2< :')2* A#$(;D ?(; VdV@/;$-,2%F @D0/$,04m 2% H3#*+ #7 =OOO =>9L!L&4 d``^=

Z[^\ P= V-;C$T4 &= "2''2-,0(%4 Y= .-#-%/24 -%* P= &-;'00(%4 lY%-'D020 (?52/A(;;$%/S'2M$ V;(/(<('0 ?(; R%S+$,-%* @/(;$* .$*2- @/;$-,2%F4m 2%H3#*+ #7 <!& :=R&O;M=!:4 h)%$ d``_=

Z[_\ @= 62)4 Q= k#-%FS@#$%4 "= h2-%F4 h= Q$J?(;*4 -%* .= &#2-%F4 lV$;S?(;,-%<$ 5()%*0 ?(; V$$;SY0020/$* 62C$ @/;$-,2%F4m 2% H3#*+ #7 <!&:=R&O;M=!:4 h)%$ d``_=

Z[i\ &= ")4 5= 624 -%* @= k#-(4 l.)'/2S<#-%%$' 62C$ VdV @/;$-,2%F!Q$?(<)02%F (% @$;C$;04m 2% H3#*+ #7 =OOO =>9L!L&4 d``_=

Zd`\ := 62)4 3= @)%4 5= 624 -%* 5= 624 l9)(/-! Q-/2(%2%F @$;C$; Q$0();<$0 2%V$$;SY0020/$* R%'2%$ E(0/2%F @D0/$,04m 2% H3#*+ #7 =OOO =!>H4 d``i=

Zd[\ 3= E)-%F4 A= k= h= :)4 +=S.= &#2)4 h= &= @= 6)24 -%* &= E)-%F4l&#-''$%F$04 +$02F% -%* Y%-'D020 (? - 6-;F$S@<-'$ VdVS1(+ @D0/$,4m2% H3#*+ #7 <!& :=R!L&&4 Y)F)0/ d``_=

Zdd\ h= Q= h-<M0(%4 lh(N0#(>S'2M$ 9)$)$2%F @D0/$,04m &)0),'6'02 :*('0*'4C('= [`4 %(= [4 >>= [e[n[fd4 [iae=

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Zdf\ 3= ")4 &= ")4 5= 624 7= 92)4 -%* := &= 6-)4 l&'()*S.$*2-! "#$% &'()* (% +$,-%* .$$/0 12*$( (% +$,-%*4m#//>!cc2=<0=#M)=#Mc!DI)c>->$;0c<'()*,$*2-=>*?4 &@4 A#$ B%2C$;02/D (?E(%F G(%F4 A$<#= Q$>=4 :$N;)-;D d`[[=

Zdb\ E= G$''$;$;4 B= V?$;0<#D4 -%* += V202%F$;4 W0)1/)*D H3#B"'6/= @>;2%F$;4d``f=

Zda\ X'04 #//>!ccIII=J$%=(;Fc=

277