在hadoop集群上运行时MRJob错误

Question

我正在尝试使用hadoop集群和MRJob运行python作业，我的包装器脚本如下：

#!/bin/bash

. /etc/profile
module load use.own
module load python/python2.7
module load python/mrjob

python path_to_python-script/mr_word_freq_count.py path_to_input_file/input.txt  -r hadoop  `> path_to_output_file/output.txt       #note the output file already exists before I submit the job`

所以一旦我使用qsub myscript.sh将此脚本提交到集群

我得到两个文件输出文件和一个错误文件：

错误文件包含以下内容：

no configs found; falling back on auto-configuration
no configs found; falling back on auto-configuration
Traceback (most recent call last):
  File "homefolder/privatemodules/python/examples/mr_word_freq_count.py", line 37, in <module>
    MRWordFreqCount.run()
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/job.py", line 500, in run
    mr_job.execute()
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/job.py", line 518, in execute
    super(MRJob, self).execute()
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/launch.py", line 146, in execute
    self.run_job()
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/launch.py", line 206, in run_job
    with self.make_runner() as runner:
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/job.py", line 541, in make_runner
    return super(MRJob, self).make_runner()
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/launch.py", line 164, in make_runner
    return HadoopJobRunner(**self.hadoop_job_runner_kwargs())
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/hadoop.py", line 179, in __init__
    super(HadoopJobRunner, self).__init__(**kwargs)
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/runner.py", line 352, in __init__
    self._opts = self.OPTION_STORE_CLASS(self.alias, opts, conf_paths)
  File "/homefolder/.local/lib/python2.7/site-packages/mrjob/hadoop.py", line 132, in __init__
    'you must set $HADOOP_HOME, or pass in hadoop_home explicitly')
Exception: you must set $HADOOP_HOME, or pass in hadoop_home explicitly

第一个问题我如何找到$ HADOOP HOME？ 当我回复$ HADOOP_HOME时，没有打印任何内容，这意味着它没有设置。 所以，即使我必须设置它，我必须设置它的路径是什么？ 它应该设置为群集中Hadoop name_node的路径吗？

第二个问题“没有发现配置”的错误表明了什么？ 它是否与$ HADOOP_HOME没有设置有关，还是期望其他配置文件被明确传入？

任何帮助将非常感激。

提前致谢！

Answer 1

首先， $HADOOP_HOME应设置为机器的本地hadoop安装路径 ，几乎所有hadoop应用程序都假设$HADOOP_HOME/bin/hadoop是hadoop可执行文件。 因此，如果您在系统默认路径中安装hadoop，则应export HADOOP_HOME=/usr/ ，否则应将export HADOOP_HOME=/path/to/hadoop

其次，你可以为mrjob提供一个特定的配置，如果没有，mrjob将使用auto-config。 在大多数情况下，提供HADOOP_HOME并使用auto-config很好，对于高级用户，请参阅http://pythonhosted.org/mrjob/guides/configs-basics.html