Experience with the PerDiS large-scale data-sharing middleware
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(55) O[%8 CS-: "D T? T?AS4B*SU:H\TDP!\ TSUX `<-GCX H8CDFXAS-:=\-JL "D T?å\TG S RDPXEG~« : RGÅYÅ"D *<U8 TDPGCX*\ Pm?ES >Å
(56) ÿ 'K "D BEOPS S-X =8 TDPGCX (8~\ I8 CSU): &B*Gz\t"D TD CSS ÅB*SU:TDPS-XA<-S Pm?ESMS-:=ÿ D[>>Å
(57) ÿ 'K S#TSUXAYE\ T?ES!\ H8CXAYE8;:=Y%L `8 /@DP X "D YÅDP!\ T:HD EN TShY&8CXA4Y ~NA8;:=8;X HS-S-DP X /\tSh< NE:H3D * ¢ \T?EG (SUY T?A 8 R:HS-O[8 H"D ~S-O ë<-G BEOPS ;L DPYÅSU"O ®NA\TSUY½OPD E:H8C:TDPSU\&\tN*<=? 8C\R79JQ &58;XAYï>Å
(58) ÿ 'K <-8CÞX S B*G~!: HSUY "D T?SU8C\TSCLGCXA<-^S H?ESêG~:TD CDPXA8CO\tG~NE:=< Só<-G@YES8CXAUY T?ASêMS-:=ÿ D[U> GÅYÅSUO ?A%8 ~S *SUS- X SUOFONEX*YÅS-:=\ HG@G@QY JPm?ADP\ @DPXAYÅD[<-8 HSU\RGCNA:RBA:T*S zDPGCN*\S @BS-:HDPS-XA<-S DPX BGC): TDP X T?AS &A]H] > =8;XAYA8;:=Y P+S BEO[8 H^S ¾æD E:=8;L: 7Í> P«¾;: ('#X ï\TDP X COPS ®BE:HG@<-SU\H\8;BEBEOPD[<-8 HDFG~X T?A8 NA\tSh\(S-"D T?ESU2: T?ES$> P«¾GC(: T?AS7ó;Q & <-GCX H8CDFXESU:H\ULzGC(: T?ES,>ÅKÿ '
(59) LE<-8CX S$< GC#X ~S-): TSU¡Y TG8 YÅDP!\ T:HD EN TShY L &NE3O H3D ®NA\TS-:hLÅB*SU:H\TD[\ HS-X GCXES$\T"D BEO Y# OPDP X /@DF X DPXGCNE:OP"D A:H8C:TDPSU*\ P. MGC:)TDPX ½8è:HSU8;O/8;BEBAOFD[<-8TDPGCXUTG MS-:=ÿD´>ïDP\ XEG8;Om8%@\`8CXåSU8~\!ÞH8~\!/12Pm?ES^`8fG~: YÅ3D Tº<-NE3O ëGÅ<-<-NE:=\$DFX OF*S ~8C< ê8CBEBEOPDP<U8TDPGCX*\IT?A8&< G~XH8;DPX±T?AS-DP:GXèDRBAOFS*RSUXH8HDFG~X G
(60) H?ES4MS-:=ÿD´±> ±8~< DPOF"D TDPSU\UL\tNA<=?ï8C\RBS-:=\tD[\HS-XA<-SJ\SBA:TG@D[YÅS ?ESU:TS\TGS SE8BEOPSU\UL T?A 8 KS&YÅDP\H< G ~S-:HSUY ?ES-X4BGC): TDP X '(HOP8CX HDPS\ 7± 8 &(' ¤ ÿ HGzG~OæBE:HG @DPYÅSh¹Y T?ASMS-:=ÿD´> BA8;): TXESU«: ¦jO: \ò?ES-X8;X 8CBEBEOPDP<U 8 TDPGCX DP\m< G~XA< SU"D ~SU¡Y "D T?AGCN \tNABEB*G~!: - äGC:m8;N HG `8 HDP<B*SU:H\TD[\ HS-XA<-S T?ESBE:H G ~:H8 SU:S ÅBEOPDP<-3D H"O ê\T%8 ~SU\G fSU< HZ\ TGYÅD[!\ /1O¾ª8 TSU:U1L ?ESU^X T?AG~\TS&G fSU< H\8;:HS :TSh8CÞY ä:TG YÅD[!\ / DFX G~:HYÅSU: T¨G S98C<U< SU\H\TSUYï8 ~8CDFXªLXES DFX*\ =8;XA<-SU\º8C:TS4< :HSU8 TShY 8CXAY DFXE"D TD[8;OPD -SUY "D TY? T?E
(61) S 8COFNESh\ :HSU8~SY ä:HG 5YÅD[!\ /1\ò3D H¡? T?ED[G\ Sh<=?A8;XED[)\ L T?ES/< G~XA\ H:TN*< TG~: DP\`DP#X CG/CSUY SU8~<=Þ? H"D Só8CX G fSh< ºD[\º:HSU8CÞY ä:HG YEDP)\ /1oZG TS T?*8 YH?EDP\ < G~XA\ H:TN*< TG~: ¸ xCn=n¤¥Í¥H¦;§ ¨h¨©+©ª©°w¦hÑU¯FÚC² ¬=° ÑH¬T¦h¯[² ¥=° Ñ=ÐU° ¯cÙ ¨-µ;¦¶´¨-¬iÚ µh² ¨j[e-d$e-dfns~nTktpUaw´u.
(62) DFX#CGÅ<U8TDPGCX&YÅG@SU\0XEGGÅ<-<-NE:+DPXMS-:=ÿD´>10hD3D[\+DPX#CG/CSUYG~XEOW?ES-XST?ESmG fSU< D[\0<-:TSh8HSUY 8;XAY XEG
(63) ?AS-X `8;BEBSUYDPX HG R*S GCL: ¡ ä:TG YÅD[!\ /1 iXOPS ~8~< 8;BEBAOFD[<- 8 TDPGCXA \ 3D H?XAG 8; N TG `8 TD[<óBS-:=\tD[!\ TS-X*< Sê\TNEBEBGC): BE:TG C:=8 S-:=\ NA\tN*8;OP"O 4\TBEOF"D $G fSh< =\DPX TGB*SU:H\TDP!\ TSUX /8;X*²Y T*S B*G~:H8C): ~L*6D S +T?EGz\tS T?A8 YEG XEG /?A%8 ~S T8 G S\T%8 ~SUYèG~X YÅD[!\ /±?ESU·X T?AS8CBEBEOPDP<U8 TDPGCX S-XAYE*\ ; iX MS-:=ÿ D[>ë"D DP\&XEG XESh< SU\H\H8;L: T G 8 /CS\tNA<=?ï8óYÅD[!\ TDPXA< HDFG~QX 'XïG fSh< DP\R\T%8 ~SU±Y HGYEDP)\ /ë3D /3D DP\R:HSU8~<=?A8 EOP¡S ä:HG T?ESBS-:=\tD[\ HS- X &:HG@G $>ÅGAL3D ZCGCN ?A%8 CS8;X 8CBEBEOPDP<U8 HDFG~ÞX "D Tu ? £T*S B*G~:H8C): G fSh< =)\ §AL CGCÞ N DFOPOm?A%8 CS¡HGêSUXA\TNE:TS T?A8 H?ES ½8C:TS XEG :TSh8C<=?A8 EOP¡S ä:TG >T?ESB*SU:H\TD[\ HS-X R:HG@G $0 G T?AS-L: DP\TSCL T?E*S ¹DPOPO SR\H%8 CSh Y TG YEDP)\ /1+Pm?ED[\ OFSh8CYE
(64) \ TG YESU< :HSU8~\tShYB*SU!: äG~): `8;X*< S8CXAY TG`NEXEXASU< Sh\T\H8;L: ºYÅD[!\ / G@<U< NEB* 8 TDPGCsX k Ç)$Ì0m ø lHúoù t Ìvvqsv#v#tuqª÷ø 'YÅS H8;DPOPSUY`8C\H\TSU\H!\ S- X G +H?ESBAOP8 ! äGCL: ?*8CG\ S-SUXºBE:HGÅYÅNA< Sh²Y ¬3%%®¢Pm?E
(65) S `8CDFX <-GCXA<-OF N \tDPGCXA\8C:TS:HS-BE:HGÅYÅNA<-SUYº?AS-:HSU8 9HS-$: nQxzy. oY zk$*X~² $*~#$*¶Þ~1. nQx9w. oY 1$k$*X~^ $$~$$¶·~#1. m?ESYEDP\!T:HD"ANTShY\T?A8;:HSUYS*RG~:)GÅYÅS-OG RMS-:=ÿD´> D[\ 8ï\tDBEOPSóBA8C:H8~YÅD" T?A8 8;BEBSU8COP\YTG 8CBEBEOPDP<U8HDFG~XåYÅS~S-OPGCBS-:=\oQAGC:T?ES8H8;:LCSTShYò8;BEBEOPD[<-8HDFG~XåYÅG`8CDFXæLD3DP\ NA<=? G~:TS9DPXTNED"TDCS.T?*8;X8CO3HS-:HXA8HD"~SU\º\TNA<=?8~\ :HS-O[8HDFG~XA8;OYA8H8A8C\TS9G~: :HSGHS DF#X CGÅ<U8 TDPGCsX Q ¢4 ä:HS-SU\,NA\tSU:HW\ ä:TG S ÅBEOPD[< "D &YÅSU<-DP\TDPGCXA\,8 *G~N G fSU< B*SU:H\TD[\ HS-XA<-SCLª8CXAY \tD BEOF"D ASh\< G~XA\tD[YÅSU:H8 E"O H?ES$BGC): TDP X G +OPS z8C< 8;BEBAOFD[<-8 TDPGCXA*\ Pm?ES$YÅDP!\ T:HD E N TDPGCX GÅYÅS-OªG 0MSU:Hÿ D´Y> `8 /~SU\("D SU8C)\ ¡HGºYÅDP!\ T:HD EN TS$YE8 H8 AQENE): T?AS-): RG~:T¹ S H?E²S C:=8;X@NEO[8;:H3D ëG YÅD[!\ T:H"D E N TDPGCX DP\`\TS-OPSU< H8 EOFS~L ?ED[<=? `8 /CSU\R"D \TNEB*SU:TDPGC: HG AXES ¢C:=8;DPXë!\ Å!\ TS `\$\TNA<=?ë8C\,W ÿ & M 7 GC: &GCL: A8 1'(W*:H!\ 8C<U< SU\H\ULæ8 O[8;L: CS ~:H8CXzNAOFSRDP\ <-8C<=?ASUYèOPGÅ<-8;OPO +0s äNE): T?ESU:R8~<-< Sh\T\TSU\&8;:HSºOPG@<U8;O¢L ?ADP<=?½D BE:HG CSU\S ÅSU<-N TDPGC·X TD RSG CSU: &GCL: A 8 # 8 ±8~< TG~:G V7k äGCp: G fSh< =L\ : LEG S GCL: #8 ±8C< TG~:G «q7k äGC4: $ G fSh< HÊ\ : -Pm?ES9YÅ:=%8 «A8CÊ< /èD[\ T?*8 <-NE:T:HS-X H"O ¨H?ES98;BABEOFD[<-8 TDPGCUX N*\ \TB*Sh< "D k G fSU< C:HGCNEBEDP X z-\ `8CXzN*8;OP"O Pm?ES,< NE:H:HS- X "D BEOPS S-X =8 TDPGCX?A8~2\ /@XEG X OPD R"D H8 TDPGCXA*\ +&NE:H:HS-X TO ¡T?AS,!\ Å!\ TS DP\ CS-L: ?AG G ~S-XESUGCNA\ULEO[8CÊ< /@DFX º8ºYE8 =8 T:=8;X*\tO[8 HDFG~XO[%8 CSU:ULÅG fSU< :HS-OPGÅ<-8 HDFG~¨X 7£tBGCDPX TSU: !\ D UOFDP X §¬"*®9: L8CXAYò\tNABEB*G~!: äGC¡: H?ESó*S CGCOPN HDFG~XïG ,\t?A8C:TShY < O[8C\H\tSh\ G iXòG~:HYES-¡: HG < GC:H:HSU< T?ESh\tS(\t?AGC): H< G DF X z\-LW8)\ Å\ HS ª äG~:+S H:H8~< HDF X K@B*S(DF X äGCL: 8 TDPGCWX ä:HG ADFXA8C): AOFSh \ m8C\YÅS ~S-OPGCBSU¹Y ¬3® E N G(8~\XES ~S-:DFX HS C:=8 HSUY&DFX H?ESBEO[8 ! äG~): ¤ äGC:O[8CÊ< /,G TD S P. êS(?A8%CSYÅGCXES(,zNA8;XTD"H8TDCSo8~\T\TSU\H\)RSUXH\æG A\tS*CSU:H8COC8C\TB*Sh< =\ªG T?ESmMS-:=ÿD´>/BEO[8) äGC:L¹ >@G SSU:TSRYÅGÅ< N S-XHSUY9DPXSU8;:HOPDFSU: \TSU< HDFG~XA\ G GH?EDP\B*8;BS-:$0*?ESU:TS(SS äGÅ< N*\ G~XEOG~X CS-XAS-:=8;OB*SU:! äG~:)`8CXA< S Pm?ES$S ÅBS-:H"D S- X =8;Oæ< G~XAYÅ"D TDPGCXA\8;:HZS H?EIS äGCOPOPG DF X X5EMS-:=ÿD´> BEO[8 ! äG~): CS-:=\TDFG~\X "~L < G BEDPOPSUY&DFXR:TSUOFSh8C\T[S GÅYÅWS 7ä6D S FL;<-G BEDPOFSU:GCB H"D D[\T8 TDPGCXA\0GCXªLWYES E N CDP X /DFX äG~): `8 TDPGCX G©[: 4\SNA\TSUY (GCL: /Å\ =8 TDPGCX*\ "D T?º8$MSUX TDP N ) JÅ^7 °KZ&([M Ú,XL $¯/87 ½G 1S G :)~L~8;X*Y:TNEXAXEDFX KZ P_ \êZS SU8C\TNE:HSUY8;X*YBE:TG AOPSUY T?A«S T?EZS G~!\ < G G~XE"O ®NA\TSUY \.
(66) M <-8COFO[\ êSºDPXA<-OFNAYES`?ES-:HS T?ES`X@N *SU:H\ äGC: T?AS T:=8;XA\H8C< TDPGCX< :HSU8 HDFG~XêBA:TD D HD ~S zL T?AS,< G D 8CXAY8 GC: mBA:TD D HD ~S 8CXAY 8CX SUXAY TG S-XAY S-XA<=? 8C: T?A8 &8;OPOFGÅ<U8 TSh\ G fSh< H\ D H?EDFX½8 H:H8CXA\H8C< HDFG~X OFO T:=8;XA\H8C< TDPGCXA\ SU8~\tNE:HSUY`8C:TS B*Sh\T\TD RD[\ TD[< oQAGC: E:TS @D (S/<-G S-X G~XEO G~X T?AS A:=\ (\TS mG XzN S-:=\. ' G *O\ W I ¡ 3 " î$fd _ g9ìî$jLìl _Li mî " ) 3 " Nfî%h _ gRìî%j)ìl_Li m î #6 ± )/^ * 4 3 ¹ QG7' [ ( ! A: ( * 3 " Y K ! S . pWð³-ÑT© ¥T¯Pµ ³ ¬iµ-ÐT¥t² ~³#r hÇî u ÕUÕh$$g. ÅðÑU³-Ú ¥H¯Fµ ³ ¬iµUÐt¥t² C³#r hÇî ÇUÕ;uw ÄUÈ,$g. b ð³-Ñt© ¥T¯Fµ;³ ¬iµ-ÐT¥f² ~³#s =î ÃhÃhÃUt-µ9 9 ;Ð=µ¥iÑ ²w³ps ÑU³-Ú ¥H¯Fµ ³ ¬iµ-ÐT¥t² C³#r Ä-WÈ;u ÄUÕ-$g ºG»¼ âuEâ ÓæÊCn=b=}Ckfawe kfaw$nmCdfnpUéCs~eã g=u. +Q DCNA:TS
(67) ÅY7Í8:o\t?EG\T?ES SÅSU<-NTDPGCXHD"S
(68) E:HSU8/ÅYÅGXTG\!H8C:!8,XEST:=8;X*\T8~< TDPGCXs G (T?ESHD"SCL`8;:L/CSUY£T]SU8CY8 ä:HG Mÿ >ÅS-XAYëYE8H8 TG9MÿL §DP\$\TBS-X&< G NEXED[<-8TDPX YD"T?²H?ES&MÿH?E:TG~N C?^PK&(M2ö% fMò\TGÅ<Ê/CS=\47äG~X²T?AS&\H8S4`8C<=?EDPXES%: XPm?AS 8 GCNEX G YE8 H8\tSUX mD[\)\ `8;OPOÍLE8CXAY \TS-X*YÅDFX ºYE8 =8&DP#X CG~"O ~SU\(XEG (8C3D 2 äG~2: T?E4S ÚZ¾s¾G \ò?ES-¨ X H?E S ÚZ¾s¾:TSh8CYE\&YE8 =8 ä:TG >T?ESMoÿ&L+"D R<U8;X½SU3D H?ES-: *S8C< TNA8COFO ê:HSU8~YÅDP X YE8 =²8 ä:HG T?AS\TGÅÊ< /CS hL+G~: m8;"D TDP X . äGC: T?ESMo´ ÿ HG<-G BEOPS TS8;X GCBS-:=8 TDPGCÞX *S äGC:HS :TS TNE:HXEDP X &W8 8COFNES # i¡X T?ED[\(OP8 !HS-:m<-8C\TSCL~3D 2EOPGÅÊ< /@\oDFXW8 äNEX*< TDPGCX<-8COFOPSUY d[ìi _ wkm#g gfaRg éÅL ?ES-:HSU8~\$:TSh8CYÅDP X äNEX*< TDPGCX*I\ 8H?E¡S äGCL: S-:<U8C\TS êYÅG9XAG SEOPGÅÊ< /.AN &8C< TNA8COFO :TSh8CY YE8 =K8 ä:HG ¤T?ES\TGÅÊ< /CS $;>@GA%L H?E2S TD S\tBS-X G#WT?ASMoÿ TGBS-): äGCL: ô"D HJ\ =8C)\ /@\0D[\ 8;O G~!\ S*,zNA8;1O HG T?EIS H"D S,\TB*SUX
(69) YT?E4S ÚZ¾s¾ëDPX d[ìi _ wkm#g gfaRg é iX8COF; O T?AS TSU!\ HI\ (SRB*SU!: äG~): SUYæ1L T?E¡S ÚK¾¾ \tBS-X $GCXEO ó8 äS æRG~:TS DFOPOPDP\TSU<-GCXAYE\ DF.X d[ìi _ wkm#g gRfaxg éYH?A8;XêDF.X T?ES äNEX*< TDPGCX:HSU8CYEDF X ä:TG óT?ES`\TGÅÊ< /CS $+Pm?ADP\\T?EG Z\ T?A8 :TSh8CYÅDP X ² ä:HG T?ES\TG@Ê< /~S &8~<-<-GCNEX HW\ äGC:R?A8;"O G «H?ES <-G NEXADP<U8 TDPGC±X H"D SDFX*YÅNA< ShY 8 î%fd _ gRìî%j)ìl_Li m îR<U8;OPzO 1&GCXA\T*S ,zNESUX H"O ~ L H?E4S =8C)\ /@«\ H8 /@DP X YG~!\ G ;H?ES,S @Sh< N HDFG~X TD RS,8C:TN S H?ES$GCXESh\m?ESU%8 @DP"O º<-G NAXEDP<U8 HDF X "D T¹? T?AS,Moÿ Pm?E. S *8C\TDP<\tSh< NE:H"D ½<=?ESUÊ< /Å\R8;XAÞY T?ES4!\ H8C!: G
(70) H?ES4!\ Å!\ T*S T:=8;XA\H8C< TDPGCX 8C:T S T?AS RGz\ S ÅB*SUXA\tD CS2=8C)\ /Å\B*SU!: äG~): SUYRDP X T?E
(71) S ÚZ¾s¾ äG~: T?AS\ =8;): G 8XES T:=8;X*\T8~< TDPGCsX ' CO[8;XA<-S/ 8 «T?ES$< GÅYÅS$\T?EG (\ T?*8 2T?ESh\tNS (G H8C)\ /Å\m8;:HS/XAG G CSU): ?ESU"O DP X CO `< G RBAOFS 10 ?ES-XA<-SC%L G~!\ +G T?E-S TD SmDP\0\tBS-X DFXR< G &NEXED[<-8 TDPGCX8CXAY%L GC:H[S CSUXES-:=8;OPO CL-DPX&)\ Å\ HS <-8;OPO[\ Uvò G #T?AGS TG H8COCS ÅSh< N HDFG~ZX H"D SG #T?ED[\+BE:TD 3D H"D ~SDP\+\tBS-X 0DFWX D[\T<-S-OPOP8CXES-G~NA\æ\TNA<=? 8C\DPX HS-:HXA8;O YE8 =8ë?A8;XAYEOFDP X 7äS Xo< G~XA\ H:TN*< TG~:H\`8CXAY YÅSU!\ T:HNA< TGC:=\UL0OPD[\ ?*8;XAYÅOPDP X "A:L ýNv.
(72) T?A8 8C<-<-GCNEX äGC:`OPSU\H\ T?A8CX vSU8~<=?QPm?ESU\TS4<-8COFO[\`8;:HS8CO"Gz\`DPXE?ES-:HS-XTGÞ&A]H] BE:TG C:=8 DFX ALÅ8;XAY8;:HSNEXA8%~GCD[YE8EOPS iX \tN `8C: ~L T?AS MS-:=ÿ D[>ëBAOP8! äGC:L>NA\!S S* 8;OPNA8HSUY äGC:?A8&D"&D[\-L0Dz SPL8 :TSh\tSh8;:=<=? BEO[8 äGC: H\ `8;DPX¹ äGÅ< NA\D[\2HSU\!TDPX º8XEGCSUOæ8;BEBA:TGz8C<=?YHGº\t?*8;:HDFX `YE8H8DPX T?ES iX HS-:HXES TSh\ HDFX 9XES 5BA8C:H8~YÅD `\-L+8C\H\tSh\T\TDFX äSh8C\T"D ADFOP3D ~L+8CXAYëS 8;OPNA8 TDP X T?ESUDF: < G~\ MS-: äGC: `8;XA<-S (8~\,XEG SH?ES BE:HD 8C): . äGÅ< NA\U;L EN ?A%8 @DF X êYÅS GCX*\ H:H8 TSU¨Y äSU8C\T"D EDFOPD G /G~NE:`DPYESU8C\UL BS-: äGCL: `8;XA<-¹S SU<-G SU\ºSU\H\tSUX HDP8C«O T±G H?ES-DP: 8~<-< SUB H8 EDPOF"D [Pm?AS MS-:=ÿD´> GÅYÅSUODP\ äSh8C\TD EOPSCL AN «T?ESU:TSD[2\ NA<=?:HGzG ¸ äGC:mBS-): äGCL: `8;XA<-S/D BE:HG CSSUX +>@G S`:TSh\tSh8;:=<=?óD[\T\TNESU\:HS-O[8 HSU8Y TG4BS-): äGCL: `8;XA<-S8C:TS`!\ TDPOFOoGCBS-XæLª\TNA<=?è8CI\ *S RG~): 8CXA8 ~S S-X hLE8;XAY T:=8;XA\H8C< TDPGCXA8CO\tNEBAB*G~!: $ . ) Q ) L¹ ¢ « Y $5Q !* ) L ¡ " ) Y ( " * . nQxRÜ. y-~$$|X;z~#~#. XëD"BGC:)H8CX,D[\H\tNESDPXT?ESºYÅSh\tDCXG MS-:=ÿ D[>8(8~\ZTG²A8COP8CXA< S(G<-GCX *DP<TDPX :TS ,~NADF:HSS-X=\5 «'5\tD BEOFS~+ L T:=8;XA\TBA8;:HS-X hLANEXE"D äGCL: DPX HS-): ±8C<-SC+L T¹G `8 /CS&3D $Sh8C\TDFSU
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