How to check the status of Hadoop tasks?

To check the status of Hadoop tasks, you can use the following methods:

1. In the Hadoop command-line interface, you can open the command line on the main node of the Hadoop cluster and use the command ‘yarn application -status ‘ to view the status of a specific task. Replace with the application identifier of the task you want to check.
2. Hadoop Web interface: The Web interface for the Hadoop cluster can be accessed on any node, typically through http://:8088 or http://:8080. On the Web interface, you can find detailed information and status about the running tasks.
3. Hadoop command-line tools: Hadoop includes several command-line tools to view task statuses. For example, you can use the command hadoop job -list to display all running tasks and their current status.
4. Log files: Hadoop records the logs of tasks in log files on each node. By browsing these log files, you can understand the process and status of task execution. On each node in the Hadoop cluster, task log files are typically located in the $HADOOP_LOG_DIR/userlogs/ directory.

By using any of the methods mentioned above, you can monitor the status of Hadoop tasks and obtain information regarding their status, progress, and other relevant details.