Configuring and Importing Sample Projects

Scenario

Spark provides sample projects for multiple scenarios, including Java projects and Scala projects. This helps users to learn Spark projects quickly.

Import methods of Java and Scala projects are the same. Sample projects developed by using the Python do not need to be imported, and you only need to open the Python file (*.py).

The import of Java sample codes is used as a sample in the following procedure. Figure 1 shows the procedure of importing sample projects.

Figure 1 Procedure of importing sample projects

Prerequisites

• Ensure that the difference between the local environment time and the cluster time is less than 5 minutes. If the time difference cannot be determined, contact the system administrator. You can view the time of the cluster in the lower-right corner on the FusionInsight Manager page.
• You have prepared the development environment and MRS cluster configuration files. For details, see Preparing the Configuration Files for Connecting to the Cluster.

Procedure

1. Obtain multiple sample projects such as Scala and Spark Streaming in the sparknormal-examples folder in the spark-examples directory where the sample code is decompressed. For details, see Obtaining Sample Projects from Huawei Mirrors
2. Obtain the configuration files required by each sample project by referring to Preparing the Configuration Files for Connecting to the Cluster and import the configuration files to the configuration file directory of the Spark sample project if you need to commission the Spark sample code in the local Windows environment.
3. After the IntelliJ IDEA and JDK are installed, configure the JDK in IntelliJ IDEA.
   1. Start the IntelliJ IDEA and select Configure.
      Figure 2 Quick Start
      
   2. Select Project Defaults from the Configure drop-down list.
      Figure 3 Configure
      
   3. Select Project Structure from Project Defaults.
      Figure 4 Project Defaults
      
   4. On the displayed Project Structure page, select SDKs and click the plus sign to add the JDK.
      Figure 5 Adding the JDK
      
   5. In the displayed Select Home Directory for JDK window, select a home directory for the JDK and click OK.
      Figure 6 Selecting a home directory for the JDK
      
   6. After selecting the JDK, click OK to complete the configuration.
      Figure 7 Completing the configuration
      

4. (Optional) If the Scala development environment is used, install the Scala plug-in in IntelliJ IDEA.
   1. Select Plugins from the Configure drop-down list.
      Figure 8 Plugins
      
   2. On the Plugins page, select Install plugin from disk.
      Figure 9 Install plugin from disk
      
   3. On the Choose Plugin File page, select the Scala plugin file of the corresponding version and click OK.

      

   4. On the Plugins page, click Apply to install the Scala plugin.
   5. On the displayed Plugins Changed page, click Restart for the configuration to take effect.
      Figure 10 Plugins Changed
      

5. Import the Java sample projects to the IDEA.
   1. Start the IntelliJ IDEA. On the Quick Start page, select Import Project.
      Alternatively, for the used IDEA tool, add the project directly from the IDEA home page. Select File > Import project... to import projects.

      Figure 11 Import Project (on the Quick Start page)
      
   2. Select the directory to store the imported projects and the pom file, and click OK.
      Figure 12 Select File or Directory to Import
      
   3. Confirm the import directory and project name, and click Next.
      Figure 13 Import Project from Maven
      
   4. Select the projects to import and click Next.
   5. Confirm the project JDK and click Next.
      Figure 14 Select project SDK
      
   6. Confirm the project name and project file location, and click Finish to complete the import.
      Figure 15 Confirm the project name and file location
      
   7. After the import, the imported projects are displayed on the IDEA home page.
      Figure 16 Imported projects
      

6. (Optional) If a sample project developed in Scala is imported, configure the language for the project.
   1. On the main page of the IDEA, choose File > Project Structures... to access the Project Structure page.
   2. Choose Modules, right-click the project name, and choose Add > Scala.
      Figure 17 Selecting the Scala language
      
   3. Wait until IDEA identifies Scala SDK, select the dependency JAR packages in the Add Scala Support dialog box, and then click OK.
      Figure 18 Add Scala Support
      
   4. If IDEA fails to identify Scala SDK, you are required to create a Scala SDK.
      1. Click Create...
         Figure 19 Create...
         
      2. On the Select JAR';s for the new Scala SDK page, click Browse...
         Figure 20 Select JAR's for the new Scala SDK
         
      3. On the Scala SDK files page, select the scala sdk directory, and then click OK.
         Figure 21 Scala SDK files
         
   5. Click OK.
      Figure 22 Successful configuration
      

7. Set the file encoding of IDEA and solve the display of garble characters.
   1. On the IDEA home page, choose File > Settings....
      Figure 23 Choosing Settings
      
   2. Configure the encoding.
      1. On the Settings page, choose Editor > File Encodings.
      2. In the Global Encoding and Project Encoding drop-down lists, select UTF-8, respectively.
      3. Click Apply.
      4. Click OK to complete the encoding configuration.

      

Sample Code Path Description