Hadoop Daemon.sh: Line 69: [: ezaccur.out: Integer Expression Expected

Introduction

When working with Hadoop, you may encounter various errors and issues. One such error is "hadoop-daemon.sh: line 69: [: ezaccur.out: integer expression expected." This error usually occurs when running the hadoop-daemon.sh script, and it points to a specific line in the script where the error occurred.

In this article, we will explore the possible causes of this error and how to resolve it. We will also provide code examples to help you better understand the issue.

Understanding the Error

To understand this error, let's first breakdown the error message:

hadoop-daemon.sh: line 69: [: ezaccur.out: integer expression expected

• hadoop-daemon.sh refers to the script file that is being executed.
• line 69 indicates the line number in the script where the error occurred.
• [: ezaccur.out: integer expression expected is the actual error message.

Possible Causes

This error is often related to an issue with a configuration file or a misconfiguration in the Hadoop environment. Here are a few possible causes:

1. Misconfigured Environment Variables: The error can occur if the environment variables related to Hadoop are not set correctly. This could lead to incorrect path settings or missing required variables.

2. Incorrect Configuration Files: Hadoop relies on several configuration files, such as core-site.xml, hdfs-site.xml, and mapred-site.xml. If these files are misconfigured or contain incorrect values, it can lead to this error.

3. Unsupported Hadoop Version: Certain versions of Hadoop may have compatibility issues or bugs that can trigger this error. Upgrading to a newer version or applying patches can fix these issues.

Resolution

To resolve the "hadoop-daemon.sh: line 69: [: ezaccur.out: integer expression expected" error, you can follow these steps:

1. Check Environment Variables: Ensure that the environment variables related to Hadoop are correctly set. These variables include HADOOP_HOME, HADOOP_CONF_DIR, and PATH. You can verify their values using the echo command:

echo $HADOOP_HOME
echo $HADOOP_CONF_DIR
echo $PATH

If any of these variables are not set or have incorrect values, update them in your shell configuration file (e.g., .bashrc or .bash_profile).

2. Verify Configuration Files: Review the Hadoop configuration files (core-site.xml, hdfs-site.xml, and mapred-site.xml) for any misconfigurations. Pay attention to any values that are supposed to be integers, such as memory sizes or port numbers.

3. Upgrade Hadoop: If you are using an older version of Hadoop, consider upgrading to a newer version. This can help resolve any compatibility issues or bugs that may be causing the error. Make sure to follow the upgrade instructions specific to your Hadoop distribution.

Code Example

Here is an example of a misconfigured environment variable that can cause the mentioned error. Let's assume HADOOP_HOME is not set correctly:

$ echo $HADOOP_HOME
/home/user/hadoop-2.7.1

To resolve this, update the variable by adding the correct path to your Hadoop installation directory:

export HADOOP_HOME=/opt/hadoop

Remember to source your shell configuration file to apply the changes:

$ source ~/.bashrc

Conclusion

The "hadoop-daemon.sh: line 69: [: ezaccur.out: integer expression expected" error can be frustrating, but with the right troubleshooting steps, you can quickly identify and resolve the issue. By checking environment variables, verifying configuration files, and considering a Hadoop upgrade, you can overcome this error and continue working with Hadoop seamlessly.

Remember to always double-check your configurations and ensure that you are using a compatible version of Hadoop. Happy Hadooping!