What is the method for starting a Hadoop cluster?

A Hadoop cluster can be started by following these steps:

1. Start the NameNode (master node) of the Hadoop cluster: Execute the start-dfs.sh script on the master node.
2. To start the ResourceManager of the Hadoop cluster: run the start-yarn.sh script on the master node.
3. Start DataNode and NodeManager: Run the start-dfs.sh and start-yarn.sh scripts on all data nodes.
4. Check the status of the Hadoop cluster by accessing the Hadoop web interface through a browser (typically at http://localhost:50070 and http://localhost:8088) to monitor the cluster’s status and operations.

It is important to note that before starting the Hadoop cluster, it is necessary to ensure that configuration files are correct and all nodes can communicate with each other. If there are any errors or issues, you can refer to Hadoop’s log files to locate and resolve them.