hadoop - 如何解决 java.lang.RuntimeException : PipeMapRed. waitOutputThreads() : subprocess failed with code 2?

Question

我正在尝试在 Hadoop 环境中执行 NLTK。以下是我用于执行的命令。

bin/hadoop jar $HADOOP_HOME/contrib/streaming/hadoop-streaming-1.0.4.jar -input /user/nltk/input/ -output /user/nltk/output1/ -file /home/hduser/softwares/NLTK/unsupervised_sentiment-master.zip -mapper /home/hduser/softwares/NLTK/unsupervised_sentiment-master/sentiment.py

unsupervised_sentiment-master.zip ---包含sentiment.py所需的所有依赖文件

我得到了

java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 2
    at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:362)
    at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:576)
    at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:135)
    at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
    at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
    at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)

任何帮助将不胜感激!!!

Answer 1

你能把python文件贴出来吗？我的猜测是，您需要将 #!/usr/bin/python 添加到 py 文件的顶部。当我使用 python 进行流式传输时就是这种情况。