How can I view node information in Hadoop?

1 year ago
Ava Mitchell
2 minutes

To view node information in the Hadoop cluster, you can use one of the following methods:

  1. Web Interface: Hadoop offers a web interface that allows users to access cluster node information through a browser. By default, the NameNode’s web interface can be accessed at http://:50070/, while the ResourceManager’s web interface is located at http://:8088/. Through these interfaces, users can view the overall status of the cluster, node health, task execution, and more.
  2. Command Line Tools: Hadoop offers various command line tools that allow you to view node information in the terminal. For example, using the following command can display the status of all nodes in the cluster:
hadoop dfsadmin -report

The following command can be used to list all active DataNode nodes:

hadoop dfsadmin -listActiveNodes

The following command can be used to list all active ResourceManager nodes:

yarn node -list
  1. JMX Interface: The JMX interface of Hadoop nodes offers APIs that allow connecting to the nodes through a JMX client to access node information. For example, tools like JConsole or VisualVM can be used to connect to the NameNode or ResourceManager to browse the node’s MBeans and view relevant information.

With these methods, you can view information about the nodes in the Hadoop cluster, such as their health, operational status, and resource usage.

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