Question

我正在尝试使用shell脚本中的以下命令运行hadoop流服务器

hadoop jar /usr/local/hadoop/contrib/streaming/hadoop-0.19.2-streaming.jar -input $1 -output Twitter/Net.pegasus -mapper 'mapper.py Reverse' -reducer NONE -file mapper.py
hadoop jar /usr/local/hadoop/contrib/streaming/hadoop-0.19.2-streaming.jar -input $1 -output Twitter/Net.exclude -mapper 'mapper.py Reverse' -reducer reducer.py -file mapper.py -file reducer.py -file ../twitter/exclude.txt
hadoop jar /usr/local/hadoop/contrib/streaming/hadoop-0.19.2-streaming.jar -input $1 -output Twitter/Net.complete -mapper 'mapper.py Reverse' -reducer reducer.py -file mapper.py -file reducer.py

我收到以下错误

/usr/bin/env: python2.5: No such file or directory
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 127
    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:1136)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)

但是已经安装了更高版本的python

$ which python
/usr/bin/python
$ python --version
Python 2.7.3

我在其他帖子中读到“apt-get install python2.5”它会起作用，但该包不可用，我也尝试将＃！/ usr / bin / env python添加到我的python脚本的顶部它没有工作

Hadoop Streaming Job failed error in python

Answer 1

$ which python
/usr/bin/python
$ python --version
Python 2.7.3

表示您安装的Python版本高于默认值。您必须确保群集中的每个节点都具有相同的大小写。例如，我使用集群Redhat 6.4版本集群，默认Python是Python 2.6我认为是默认的，但我已经定制了主节点，它与datanode不同。因此，您需要配置映射器以调用每个节点上存在的python。

把

#!/usr/bin/python

在python脚本开头的

始终适合我。

hadoop / usr / bin / env：python：没有这样的文件或目录

1 个答案: