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我在Amazon EMR上運行我自己的地圖縮減任務。我發現地圖任務失敗,我無法找出失敗地圖任務的原因。地圖功能在EMR中的mapreduce運行失敗
import fileinput
import csv
myDict = {}
csvreader = csv.reader(fileinput.input(mode='rb'), delimiter=',')
for newline in csvreader:
#newline = line.split(',')
if newline[6] not in myDict.keys():
#print 'Zipcode: ' + row[6] + ' Hospital code: ' + row[1]
myDict[newline[6]] = 1
elif newline[6] in myDict.keys():
#print 'value in row '+ str(myDict[row[6]])
myDict[newline[6]] += 1
for key in myDict.keys():
print '%s\t%s' % (str(key), str(myDict[key]))
map任務是讀取作爲輸入給出的csv文件,使用兩列中的數據創建鍵值對。減少任務是聚合它們並打印它們。
以下是當不在腳本頂部添加#!/ usr/bin/env python時爲maptask獲取的stderr。如果是ADDE,d標準錯誤是空白,但在maptask失敗:
/mnt/var/lib/hadoop/tmp/nm-local-dir/usercache/hadoop/appcache/application_1417478068297_0008/container_1417478068297_0008_01_000005/./map_zip_hospi.py: line 1: import: command not found
/mnt/var/lib/hadoop/tmp/nm-local-dir/usercache/hadoop/appcache/application_1417478068297_0008/container_1417478068297_0008_01_000005/./map_zip_hospi.py: line 2: import: command not found
/mnt/var/lib/hadoop/tmp/nm-local-dir/usercache/hadoop/appcache/application_1417478068297_0008/container_1417478068297_0008_01_000005/./map_zip_hospi.py: line 3: myDict: command not found
/mnt/var/lib/hadoop/tmp/nm-local-dir/usercache/hadoop/appcache/application_1417478068297_0008/container_1417478068297_0008_01_000005/./map_zip_hospi.py: line 4: syntax error near unexpected token `('
/mnt/var/lib/hadoop/tmp/nm-local-dir/usercache/hadoop/appcache/application_1417478068297_0008/container_1417478068297_0008_01_000005/./map_zip_hospi.py: line 4: `csvreader = csv.reader(fileinput.input(), delimiter=',')
'
我可以從地圖上的任務是失敗的控制檯中看到。有人可以幫我找到我的代碼的錯誤?