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Spark Driver and Executor logs in yarn cluster mode for CDP clusters

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Expert Contributor

Where is the location for the Spark driver and executor logs when the Spark job is executed in YARN cluster mode?

Does yarn logs -applicationId CMD capture the logs? I can't find log4j-active.log for the driver.

1 REPLY 1

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Super Collaborator

Hi @zhuw.bigdata 

To locate Spark logs, follow these steps:

  1. Access the Spark UI: Open the Spark UI in your web browser.
  2. Identify Nodes: Navigate to the Executors tab to view information about the driver and executor nodes involved in the Spark application.
  3. Determine Log Directory: Within the Spark UI, find the Hadoop settings section and locate the value of the yarn.nodemanager.log-dirs property. This specifies the base directory for Spark logs on the cluster.
  4. Access Log Location: Using a terminal or SSH, log in to the relevant node (driver or executor) where the logs you need are located.
  5. Navigate to Application Log Directory: Within the yarn.nodemanager.log-dirs directory, access the subdirectory for the specific application using the pattern application_${appid}, where ${appid} is the unique application ID of the Spark job.
  6. Find Container Logs: Within the application directory, locate the individual container log directories named container_{$contid}, where ${contid} is the container ID.
  7. Review Log Files: Each container directory contains the following log files generated by that container:
    • stderr: Standard error output
    • stdin: Standard input (if applicable)
    • syslog: System-level logs