Hadoop mapreduce wordcount program fails with exitcode 9009

  • 9 months ago
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Exit code 9009 typically indicates that the command you're trying to run in your Hadoop MapReduce word count program is not found or cannot be executed. It's often related to issues with environment variables or paths.

Here are a few steps you can take to troubleshoot and fix this issue:

  1. Check Environment Variables:
    Make sure that all the necessary environment variables required by Hadoop are correctly set. These might include HADOOP_HOME, JAVA_HOME, and others. Ensure that they point to the right locations.

  2. Check Paths:
    Ensure that the paths to Hadoop executables, Java, and other required tools are correctly configured in your system's PATH environment variable. The command you're trying to run (like hadoop, hdfs, or yarn) should be reachable from any directory in the command prompt.

  3. Check Hadoop Configuration:
    Verify that your Hadoop configuration files (core-site.xml, hdfs-site.xml, mapred-site.xml, yarn-site.xml, etc.) are correctly configured. Check the values for properties like mapreduce.framework.name, fs.defaultFS, and others that are relevant to your MapReduce job.

  4. Check Command Syntax:
    Double-check the command you're trying to run in your MapReduce program. Ensure that you're providing the right arguments, paths, and input/output file paths.

  5. Check Java Version:
    Ensure that you're using a compatible Java version with your Hadoop distribution. Some Hadoop versions require specific Java versions to work correctly.

  6. Check File Permissions:
    Make sure that the input and output directories you're using in your MapReduce program have the necessary read and write permissions.

  7. Check Logging:
    If possible, check the Hadoop logs to see if there are more detailed error messages that can provide insights into what's causing the failure.

  8. Rebuild and Package:
    If you're using a custom MapReduce program, make sure that you've correctly packaged your program with all its dependencies. Sometimes, issues can arise if the JAR file is not built properly.

  9. Use Full Paths:
    When specifying paths for input and output directories or any files in your MapReduce program, use full absolute paths to avoid any ambiguity.

By carefully going through these steps and checking each aspect of your Hadoop setup and MapReduce program, you should be able to identify the root cause of the exit code 9009 issue and resolve it.