How to Kill a YARN Application by Name: A Step-by-Step Guide

In a YARN (Yet Another Resource Negotiator) cluster, managing and terminating applications efficiently is crucial for optimal resource utilization and cluster performance. To kill a YARN application by its name, you can use the command:

yarn application -kill <application-id>

Replace <application-id> with the actual ID of the application you want to terminate.

Properly managing and terminating applications helps prevent resource hogging, ensures fair resource distribution, and maintains the overall health of the cluster. This is essential for running a stable and efficient Hadoop ecosystem.

Understanding YARN Applications

A YARN application in the Hadoop ecosystem is a program that performs data processing tasks. It consists of a ResourceManager (RM) and an ApplicationMaster (AM). The RM allocates resources across the cluster, while the AM manages the execution of tasks within the application.

Identifying applications by name is crucial for management purposes because it allows administrators to monitor, troubleshoot, and optimize resource usage effectively. It also helps in tracking the progress and status of specific applications, ensuring efficient cluster management.

Steps to Kill YARN Application by Application Name

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Common Issues and Troubleshooting

Here are some common issues you might encounter when trying to kill a YARN application by its name, along with troubleshooting tips and solutions:

1. Application Not Found:

   • Issue: The application name provided does not match any running applications.
   • Solution: Ensure the application name is correct. Use the yarn application -list command to verify the exact name or ID of the running application.

2. Permission Denied:

   • Issue: The user does not have the necessary permissions to kill the application.
   • Solution: Verify that you have the required permissions. If not, contact the cluster administrator to grant the necessary permissions.

3. Kerberos Authentication Issues:

   • Issue: Kerberos authentication is not enabled, preventing the kill operation.
   • Solution: Enable Kerberos authentication for the Resource Manager web services. This can be done by configuring the necessary Kerberos settings.

4. Application in Waiting State:

   • Issue: The application is stuck in a “waiting to be killed” state.
   • Solution: Check the Resource Manager logs to confirm the application’s state transition. Adjust the yarn.client.application-client-protocol.poll-timeout-ms parameter to reduce the wait time.

5. Internal Server Error:

   • Issue: An internal server error occurs when attempting to kill the application via the YARN API.
   • Solution: Ensure the API request is correctly formatted. Check the server logs for more details on the error and address any underlying issues.

6. Multiple Applications:

   • Issue: Need to kill multiple applications at once.
   • Solution: Use a combination of grep and awk commands to filter and extract application IDs, then use the yarn application -kill command to stop them.

If you encounter any of these issues, these tips should help you troubleshoot and resolve them effectively. If problems persist, consulting the YARN documentation or seeking support from the community can provide additional guidance.

Best Practices

Here are the best practices for managing and terminating YARN applications by application name:

1. Use Command-Line Tools:

   • List Applications: yarn application -list to view all running applications.
   • Terminate Application: yarn application -kill <application_id> to terminate a specific application by its ID.
   • Move Application: yarn application -movetoqueue <application_id> -queue <queue_name> to move an application to a different queue.

2. Regular Monitoring:

   • YARN Web UI: Regularly check the YARN Web UI for an overview of running and completed applications, resource utilization, and logs.
   • Log Aggregation: Configure YARN to aggregate logs to a centralized location for easier debugging and analysis.

3. Resource Management:

   • Resource Allocation: Properly configure memory and CPU allocation per container in yarn-site.xml to ensure efficient resource utilization.
   • Scheduling Policies: Choose appropriate scheduling policies (e.g., Fair Scheduler, Capacity Scheduler) based on workload requirements.
   • Node Health Checks: Regularly configure and monitor node health checks to detect failures or resource constraints.

4. High Availability:

   • Enable High Availability for YARN by configuring redundant ResourceManager nodes and automatic failover mechanisms.

5. Resource Monitoring Tools:

   • Use tools like Ganglia or Ambari integrated with YARN to track resource utilization across the cluster and identify bottlenecks.

Regular monitoring and proper resource management are crucial to ensure the efficient operation of YARN applications, prevent resource contention, and maintain overall cluster health.

To Manage and Terminate YARN Applications Efficiently

To manage and terminate YARN applications efficiently, use the command `yarn application -kill ` to kill an application by its ID. Properly managing applications helps prevent resource hogging, ensures fair resource distribution, and maintains cluster health.

Identifying applications by name allows administrators to monitor, troubleshoot, and optimize resource usage effectively.

Common Issues When Killing YARN Applications

• Application Not Found
• Permission Denied
• Kerberos Authentication Issues
• Application in Waiting State
• Internal Server Error
• Multiple Applications

Troubleshooting tips are provided for each issue.

Best Practices for Managing YARN Applications

• Using command-line tools
• Resource management
• High availability
• Resource monitoring tools

Regular monitoring and proper resource management are crucial to ensure efficient operation of YARN applications and maintain overall cluster health.