Not a valid JAR when running HADOOP example

Question

I have installed hadoop-2.4.0 in my 14.04 LTS,

I have followed this link, I have done upto start and stop services successfully,

but when I tried to execute example,

$ /bin/hadoop jar hadoop*examples*.jar wordcount /user/hduser/gutenberg /user/hduser/gutenberg-output

and I am getting response as,

Not a valid JAR: /hadoop*examples*.jar

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EDIT 1

I have installed JAVA 7(i.e JDK 1.7) and when I used Hadoop-1.0.3 it works fine.

Problem cause when I try to execute with Hadoop-2.4.0.

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NOTE

From this tutorial my system differ the following,

1. I am using JAVA 7 instead of JAVA 6.
2. I am using Hadoop 2.4.0 instead of Hadoop-1.0.3
3. I am usinh Ubuntu 14.04 instead of Ubuntu 10.04.

And I can successfully execute HAdoop-1.0.3 with JAVA 7 on 14.04.

My question why can't I run the same for Hadoop-2.4.0.

Solution 1

I had the same problem. Here is the solution.

OS - Ubuntu 14.04 64-bit
Java - OpenJDK 7
Hadoop - Hadoop 2.4.1

Step 1: create a hdfs directory for input: hadoop dfs -mkdir -p /usr/local/hadoop/input

Step 2: now paste the jar file into this folder using hadoop command.

hadoop dfs -copyFromLocal /home/hduser/Desktop/sample.txt /usr/local/hadoop/input

Step 3: Go to $HADOOP_HOME/share/hadoop/mapreduce folder in terminal.

cd $HADOOP_HOME/share/hadoop/mapreduce

hadoop jar hadoop-mapreduce-examples-2.4.1.jar wordcount /usr/local/hadoop/input/sample.txt /usr/local/hadoop/output

Here /usr/local/hadoop/output folder will be created. Each time you have to give a new name.
NOTE: you cannot simply list the folders input and output using ls in terminal.

Step 4: To view the output, use this:

hadoop dfs -cat /usr/local/hadoop/output/part-r-00000

Solution 2

I was also following the same tutorial and faced same issue with my latest install (hadoop 2.7.1). I had to change it from

$ /bin/hadoop jar hadoop*examples*.jar wordcount /user/hduser/gutenberg /user/hduser/gutenberg-output

to

$ /bin/hadoop jar ./share/hadoop/mapreduce/hadoop-*-examples*.jar  wordcount /user/hduser/gutenberg /user/hduser/gutenberg-output

Comments

[A J]

I didn't followed exactly the same as tutorial said, I am using Oracle Java(JDK 1.7) and I am using Hadoop 2.4.0, actually my problem isn't that.. I can do with Hadoop 1.0.3 sucessfully.. When I do with Hadoop 2.4.0 am getting this problem...

[A J]

I have update my question, please take a look @Tim

[Tim]

Does this work? codesfusion.blogspot.co.uk/2013/10/…

[A J]

I followed this only, I got error when i run example...

[kishorer747]

@ARUL, instead of using hadoop*examples*.jar , you need to use this jar hadoop-mapreduce-examples-2.4.1.jar in the folder $HADOOP_HOME/share/hadoop/mapreduce. You are getting the error because you are not specifying the path for jar. So navigate to the folder using cd $HADOOP_HOME/share/hadoop/mapreduce and then run the jar. It works fine.

[David Foerster]

Welcome to Ask Ubuntu! I recommend editing this answer to expand it with specific details about what to edit and how. (See also How do I write a good answer? for general advice about what sorts of answers are considered most valuable on Ask Ubuntu.)