我正在学习一个大数据类，我的一个项目是在本地建立的Hadoop集群上运行Mapper/Reducer。在
我一直在为类使用Python和MRJob库。在
下面是我当前用于Mapper/Reducer的Python代码。在from mrjob.job import MRJob
from mrjob.step import MRStep
import re
import os
WORD_RE = re.compile(r"[\w']+")
choice = ""
class MRPrepositionsFinder(MRJob):
def steps(self):
return [
MRStep(mapper=self.mapper_get_words),
MRStep(reducer=self.reducer_find_prep_word)
]
def mapper_get_words(self, _, line):
# set word_list to indicators, convert to lowercase, and strip whitespace
word_list = set(line.lower().strip() for line in open("/hdfs/user/user/indicators.txt"))
# set filename to map_input_file
fileName = os.environ['map_input_file']
# itterate through each word in line
for word in WORD_RE.findall(line):
# if word is in indicators, yield chocie as filename
if word.lower() in word_list:
choice = fileName.split('/')[5]
yield (choice, 1)
def reducer_find_prep_word(self, choice, counts):
# each item of choice is (choice, count),
# so yielding results in value=choice, key=count
yield (choice, sum(counts))
if __name__ == '__main__':
MRPrepositionsFinder.run()
当我试图在Hadoop集群上运行代码时，我使用了以下命令：
^{pr2}$
不幸的是，每次运行该命令时都会出现以下错误：No configs found; falling back on auto-configuration
STDERR: Error: JAVA_HOME is not set and could not be found.
Traceback (most recent call last):
File "hrc_discover.py", line 37, in
MRPrepositionsFinder.run()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/job.py", line 432, in run
mr_job.execute()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/job.py", line 453, in execute
super(MRJob, self).execute()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/launch.py", line 161, in execute
self.run_job()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/launch.py", line 231, in run_job
runner.run()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/runner.py", line 437, in run
self._run()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/hadoop.py", line 346, in _run
self._find_binaries_and_jars()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/hadoop.py", line 361, in _find_binaries_and_jars
self.get_hadoop_version()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/hadoop.py", line 198, in get_hadoop_version
return self.fs.get_hadoop_version()
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/fs/hadoop.py", line 117, in get_hadoop_version
stdout = self.invoke_hadoop(['version'], return_stdout=True)
File "/usr/lib/python3.5/site-packages/mrjob-0.6.0.dev0-py3.5.egg/mrjob/fs/hadoop.py", line 172, in invoke_hadoop
raise CalledProcessError(proc.returncode, args)
subprocess.CalledProcessError: Command '['/usr/bin/hadoop', 'version']' returned non-zero exit status 1
我浏览了一下互联网，发现我需要导出我的JAVA_HOME变量-但我不想设置任何可能破坏我的设置的东西。在
如有任何帮助，将不胜感激，谢谢！在
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