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Asked: 2014-04-26 02:05:37 +0800 CST

Not a valid JAR when running HADOOP example

  • 772

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

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.

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.

14.04

4 Answers

  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

    • 1

  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
    • 1

  3. This tutorial has been tested with the following software versions:

    Ubuntu Linux 10.04 LTS (deprecated: 8.10 LTS, 8.04, 7.10, 7.04)

    It hasn't been updated since 10.04 ~ 2012. That is (I would guess your problem).

    14.04 and 10.04 work quite differently...

    Sun Java 6

    Sun Java is no longer avaliable in Ubuntu so that is also probably why it isn't working.

    • 0

  4. I am using the hadoop-2.7.2 and to handle this problem, simply go to the directory hadoop-2.7.2 and instead of writing directly hadop*exaples*jar write the following:

    share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar
    • -1