java 如何找到 JAR：/home/hadoop/contrib/streaming/hadoop-streaming.jar
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/32543734/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how to find JAR: /home/hadoop/contrib/streaming/hadoop-streaming.jar
提问by harshil bhatt
I'm practicing a video tutorial from plural sight about Amazon EMR. I am stuck as i cannot proceed as i am getting this error
我正在从多个角度练习有关 Amazon EMR 的视频教程。我被卡住了，因为我收到此错误而无法继续
Not a valid JAR: /home/hadoop/contrib/streaming/hadoop-streaming.jar
Not a valid JAR: /home/hadoop/contrib/streaming/hadoop-streaming.jar
Please note that tutorial is old and it is using a older Emr version. I am using the latest version is that a problem ?
请注意，教程是旧的，它使用的是较旧的 Emr 版本。我用的是最新版本，有问题吗？
The steps that i took are after entering the credentials in putty
我采取的步骤是在腻子中输入凭据后
1) Hadoop
2) mkdir streamingCode`
3) wget -o ./streamingCode/wordSplitter.py s3://elasticmapreduce/samples/wordcount/wordSplitter.py
4) hadoop jar contrib/streaming/hadoop-streaming.jar -files streamingCode/wordSplitter.py -mapper wordSplitter.py input s3://elasticmapreduce/samples/wordcount/input -output streamingCode/wordCountOut -reducer aggregate`
1) Hadoop
2) mkdir 流代码`
3) wget -o ./streamingCode/wordSplitter.py s3://elasticmapreduce/samples/wordcount/wordSplitter.py
4) hadoop jar contrib/streaming/hadoop-streaming.jar -files streamingCode/wordSplitter.py -mapper wordSplitter.py input s3://elasticmapreduce/samples/wordcount/input -outputstreamingCode/wordCountOut -reducer聚合`
I cannot execute step 4 as i am getting the below error
我无法执行第 4 步，因为我收到以下错误
Not a valid JAR: /home/hadoop/contrib/streaming/hadoop-streaming.jar
Not a valid JAR: /home/hadoop/contrib/streaming/hadoop-streaming.jar
回答by ChristopherB
The Hadoop streaming jar is still available in the latest release of EMR Hadoop. Starting with EMR release 4.0.0 it can be found at /usr/lib/hadoop-mapreduce/hadoop-streaming.jar.
Hadoop 流 jar 在最新版本的 EMR Hadoop 中仍然可用。从 EMR 版本 4.0.0 开始，可以在/usr/lib/hadoop-mapreduce/hadoop-streaming.jar.
Another good resource for differences between versions can be found at http://docs.aws.amazon.com/ElasticMapReduce/latest/ReleaseGuide/emr-release-differences.html.
另一个关于版本差异的好资源可以在http://docs.aws.amazon.com/ElasticMapReduce/latest/ReleaseGuide/emr-release-differences.html找到。
回答by Nikhil B Agarwal
For the variable, HADOOP_STREAMING, obtaining the path is a bit more complicated depending on the HDP you are using.
对于变量 HADOOP_STREAMING，根据您使用的 HDP，获取路径有点复杂。
Search for where it is located via command: find / -name 'hadoop-streaming*.jar'
通过命令搜索它所在的位置： find / -name 'hadoop-streaming*.jar'
源代码：http: //thecoatlessprofessor.com/programming/installing-r-studio-server-on-hortonworks-virtual-box-image-and-rmr2-aka-rhadoop-r-package/
