10 Figure below shows an execution of a practical MapReduce programme called WebVisCounter The program counts the number of times users connect to or visit a given website using a particular operating system (e g Windows or Mac) A single line of a typical web server log file is fed into the MapReduce framework, which is shown in the Line offset column Here, you are required to demonstrate your understanding of MapReduce execution by working out the outcome of each task box figure shown below (e g MAP1, MAP2, PAR1, PAR2, etc ) where the final outcome should match the expected result at the Output stage Map Partitioning Line offset M1 M1 M1 Sort group (0, 77 241 136 xx 12 Jan 2010 Macintosh U) (207, 58 87 64 xx ( 12 Jan 2010 WinXP U) (290, 78 41 226 xx 10 Jan 2010 Win98 U) (310,213 163 90 xx 29 Dec 2009 WinXP U) R1 MAP1 PAR1 Output (Macintosh, 4) Reduce SOR1 M2 M2 M2 RED1 (320,110 5 116 xx 20 Nov2009 WinXP U) (380, 62 106 0 xx 20 Nov 2009 Macintosh U) (420, 116 212 64 xx 20 Nov 2009 Win98 U) (540, 1212 80 0 xx 19 Nov 2009 Macintosh U) (459, 80 82 96 xx 19 Nov 2009 MAP2 PAR2 (Win98, 3) (WinXP, 5) WinXP U) RED2 SOR2 M3 M3 M3 (612, 77 236 192 xx 18 Nov 2009 WinXP U) (682,77 230 60 xx 17 Nov 2009 Macintosh U) (710, 216 55 163 xx 17 Nov 2009 Win98 U) MAP3 PAR3 R2 Local disk of map wo rkers Local disk of redu ce workers

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Question: 10. Figure below shows an execution of a practical MapReduce programme called WebVisCounter. The program counts the number of times users connect to or visit

10. Figure below shows an execution of a practical MapReduce programme called WebVisCounter. The program counts the number of times users connect to or visit a given website using a particular operating system (e.g. Windows or Mac). A single line of a typical web server log file is fed into the MapReduce framework, which is shown in the Line offset column. Here, you are required to demonstrate your understanding of MapReduce execution by working out the outcome of each task/box figure shown below (e.g. MAP1, MAP2, PAR1, PAR2, etc.) where the final outcome should match the expected result at the Output stage. 10. Figure below shows an execution of a practical MapReduce programme called

Map Partitioning Line offset M1 M1 M1 Sort & group (0, 77.241.136.xx- [12/Jan/2010...]... Macintosh; U) (207, 58.87.64.xx - ([12/Jan/2010...]... WinXP; U) (290, 78.41.226.xx [10/Jan/2010...]... Win98; U) (310,213.163.90.xx-[29/Dec/2009..]... WinXP; U) R1 MAP1 PAR1 Output (Macintosh, 4) Reduce SOR1 M2 M2 M2 RED1 (320,110.5.116.xx- [20/Nov2009..]... WinXP: U) (380, 62.106.0.xx-- [20/Nov/2009...] Macintosh; U) (420, 116.212.64.xx [20/Nov/2009...] .. Win98; U) (540, 1212.80.0.xx-[19/Nov/2009....Macintosh; U) (459, 80.82.96.xx --[19/Nov/2009...] MAP2 PAR2 (Win98, 3) (WinXP, 5) WinXP; U) RED2 SOR2 M3 M3 M3 (612, 77.236.192.xx- [18/Nov/2009...]... WinXP; U) (682,77.230.60.xx--[17/Nov/2009...]...Macintosh; U) (710, 216.55.163.xx--[17/Nov/2009...]... Win98; U) MAP3 PAR3 R2 Local disk of map wo rkers Local disk of redu ce workers

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