Development process description

Figure 1 and Table 1 describe the development process.

Figure 1 MapReduce application development process

**Table 1** Description of the MapReduce development process
Step	Description	Reference
Preparing the development environment	Before you start development, prepare the development environment. You are advised to use the Java language and IntelliJ IDEA tool to develop applications, and complete initial configurations of JDK and Maven.	Preparing for Development Environment
Preparing the configuration files for connecting to the cluster	During the development or a test run of the program, you need to use the cluster configuration files to connect to an MRS cluster. The configuration files usually contain the cluster component information file and user files used for security authentication. You can obtain the required information from the created MRS cluster. Nodes used for program debugging or running must be able to communicate with the nodes within the MRS cluster, and the hosts domain name must be configured.	Preparing the Configuration Files for Connecting to the Cluster
Configuring and importing sample projects	HBase provides a range of sample projects for different scenarios. You can obtain a sample project and import it to the local development environment.	Configuring and Importing Sample Projects
Configuring security authentication	If you are using an MRS cluster with Kerberos authentication enabled, security authentication is required.	Preparing for Security Authentication
Write program code for a service scenario.	Develop the program based on service requirements and call component APIs to implement required functions.	Developing the Project
Compile and run the program.	Compile and run the program. You can debug and run the program in the local Windows development environment, or compile the program into a JAR package and submit it to a Linux node.	Debugging the Application