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我已經創建了一個使用paramiko的小Python腳本,它允許我在不使用PuTTY或cmd窗口的情況下運行MapReduce作業來啓動作業。這很好,除非在作業完成之前我無法看到stdout。我怎麼能設置這個,以便我可以看到生成的每一行stdout,就像我可以通過cmd窗口一樣?MapReduce與paramiko如何打印標準輸出流
這裏是我的腳本:
import paramiko
# Define connection info
host_ip = 'xx.xx.xx.xx'
user = 'xxxxxxxxx'
pw = 'xxxxxxxxx'
# Commands
list_dir = "ls /nfs_home/appers/cnielsen -l"
MR = "hadoop jar /opt/cloudera/parcels/CDH/lib/hadoop-0.20-mapreduce/contrib/streaming/hadoop-streaming.jar -files /nfs_home/appers/cnielsen/product_lookups.xml -file /nfs_home/appers/cnielsen/Mapper.py -file /nfs_home/appers/cnielsen/Reducer.py -mapper '/usr/lib/python_2.7.3/bin/python Mapper.py test1' -file /nfs_home/appers/cnielsen/Process.py -reducer '/usr/lib/python_2.7.3/bin/python Reducer.py' -input /nfs_home/appers/extracts/*/*.xml -output /user/loc/output/cnielsen/test51"
getmerge = "hadoop fs -getmerge /user/loc/output/cnielsen/test51 /nfs_home/appers/cnielsen/test_010716_0.txt"
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(host_ip, username=user, password=pw)
##stdin, stdout, stderr = client.exec_command(list_dir)
##stdin, stdout, stderr = client.exec_command(getmerge)
stdin, stdout, stderr = client.exec_command(MR)
print "Executing command..."
for line in stdout:
print '... ' + line.strip('\n')
for l in stderr:
print '... ' + l.strip('\n')
client.close()
這似乎採取了一個適應例如由於緩衝來發生。不知何故,默認的行緩衝被覆蓋。你能說明你如何運行這個腳本和主機環境的細節嗎? – mohit
我在Windows 7上的PyScripter IDE中運行此腳本。 –