如何解决java.lang.RuntimeException：PipeMapRed.waitOutputThreads（）：子进程失败，代码2？ [英] How to resolve java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 2?

问题描述

我试图在Hadoop环境中执行NLTK。

bin / hadoop jar $ HADOOP_HOME / contrib / streaming / hadoop-streaming-1.0.4.jar -input / user / nltk / input / -putput / 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所需的所有相关文件。

p>

java.lang.RuntimeException：PipeMapRed.waitOutputThreads（）：子进程失败，代码为2
，位于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）

任何帮助都将不胜感激!!! 您可以请求发布python文件吗？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。

Best，
Hari

I am trying to execute NLTK in Hadoop environment. Following is the command which i used for execution.

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 --- contains all the dependent files required for sentiment.py

I am getting

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)

Any help would be greatly appreciated!!!

解决方案

Could you pls post the python files? My guess is that, you need to add #!/usr/bin/python to the top of your py file. This was the case when I was streaming using python.

Best, Hari

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