What is the method for configuring parameters in a Hadoop cluster?

There are two ways to configure parameters for a Hadoop cluster: through the command line or through configuration files.

1. Command-line approach: Parameters can be configured on the main node of the Hadoop cluster using command-line tools, such as the “hadoop dfsadmin -setSpaceQuota” command for setting HDFS quotas. This method is suitable for temporary parameter modifications, but it is not as flexible or convenient.
2. Configuration file method: The parameter configuration of the Hadoop cluster is mainly achieved by modifying Hadoop’s configuration files. The main configuration files of Hadoop include core-site.xml, hdfs-site.xml, mapred-site.xml, and yarn-site.xml, etc. Users can edit these configuration files to modify various parameters of the Hadoop cluster, such as setting the number of replicas for data nodes, adjusting the resource configuration of MapReduce jobs, etc. This method is more flexible and convenient, suitable for persistently configuring parameters of the Hadoop cluster.