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MaxTemp Program using
Apache MapReduce
• ip_data = LOAD 'pig_mt_input/MaxTemp_data.txt' USING PigStorage(',') AS
(City:charArray,Temp:int);
• dump ip_data;
• cities = GROUP ip_data by City;
• dump cities;
• op = foreach cities generate group, MAX(ip_data.Temp);
• dump op;
• store op into '/user/cloudera/pig_maxtemp/'1;
• Input Data:
Hyderabad,37
Nizamabad,41
Warangal,36
Hyderabad,42
Secunderabad,39
Hyderabad,40
Warangal,40
Nizamabad,44
Secunderabad,46
Bhimavaram,41
• Open the grunt shell by typing in pig command.
• Load the input data from hdfs .
• Following is content of pig_word.txt file as seen from hue browser.
• Use dump command to display the contents of input data.
• Group the data based on cities and display the data.
• For each city select the maximum temperature.
• Print the contents of the output by using dump command. Store the output data into
hdfs. grunt> store op into ‘/user/cloudera/pig_maxtemp’;
Thank You
Pig MaxTemp PPT.pptx

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Pig MaxTemp PPT.pptx