How can Hadoop access YARN logs?

There are several ways to access YARN logs.

1. Viewing logs through YARN’s Web UI: YARN offers a web interface that can be accessed in a browser to view the logs of different applications. By default, YARN’s Web UI listens on port 8088 and can be accessed at http://:8088. Within the Web UI, you can select a specific application and view its logs.
2. Get logs using YARN command line tools: YARN offers several command line tools that can be used to access and manage logs. Some commonly used commands include:
3. This command allows you to retrieve logs for a specific application using the application ID.
4. Use the command “yarn logs -applicationId -containerId ” to retrieve the logs for a specific container.
5. Use yarn logs -applicationId -nodeAddress to retrieve logs on a specific node.
6. You can obtain the corresponding logs by executing these commands in the command line.
7. To view the log files directly, YARN stores the application logs in HDFS. By default, the log files are stored in the /user//logs directory. You can use HDFS commands or other tools (such as Hadoop command-line tools or Hadoop client libraries) to view these log files.

The above are several common ways to access YARN logs. The specific method to use depends on your needs and environment configuration.