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mrtravelaggregator.py
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mrtravelaggregator.py
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from itertools import groupby
from operator import itemgetter
import json
from collections import defaultdict
import datetime
from mrjob.job import MRJob
from mrjob.protocol import JSONValueProtocol
class MRTravelAggregator(MRJob):
INPUT_PROTOCOL = JSONValueProtocol
OUTPUT_PROTOCOL = JSONValueProtocol
#file = open('input_file.json','r')
def mapper(keyin,file):
input_data=[]
for line in file:
line = json.loads(line[:len(line)-1])
date1= datetime.datetime.fromtimestamp(int(line["timestamp"]))
line["days_in_month"] = date1.day
input_data.append(line)
grouper = itemgetter("departureId","arrivalId","provider","days_in_month")
for key, grp in groupby(sorted(input_data, key = grouper), grouper):
val_dict["value"] = []
val_dict["day_in_month"] = []
key_dict = dict(zip(["departureId","arrivalId","provider"], key[:3]))
val_dict["value"].append(sum(item["value"] for item in grp))
val_dict["day_in_month"]=str(key)
yield key_dict,val_dict
def reducer(key_dict,val_dict):
grouper = itemgetter("day_in_month")
series = []
if len(val_dict)>1:
for key, grp in groupby(sorted(val_dict, key = grouper), grouper):
temp_json = {}#defaultdict()
temp_json["day_in_month"] = key
temp_json["sumOfValues"] = sum(item["value"][0] for item in grp)
series.append(temp_json)
else:
temp_json ={} #defaultdict()
temp_json["day_in_month"] = val_dict["day_in_month"]
temp_json["sumOfValues"] = val_dict["value"]
series.append(temp_json)
#temp_dict = defaultdict()
key_dict["series"] = series
yield key_dict
if __name__=='__main__':
MRTravelAggregator.run()