Preparing for Development and Operating Environment

Preparing Development Environment

Table 1 describes the environment required for application development.

Preparing an Operating Environment

During application development, you need to prepare the code running and commissioning environment to verify that the application is running properly.

• If the local Windows development environment can communicate with the cluster service plane network, download the cluster client to the local host; obtain the cluster configuration file required by the commissioning program; configure the network connection, and commission the program in Windows.
  1. Log in to the FusionInsight Manager portal and choose Cluster > Dashboard > More > Download Client. Set Select Client Type to Complete Client (For MRS 3.3.0 or later, click Download Client in the upper right corner of the Homepage). Select the platform type based on the type of the node where the client is to be installed (select x86_64 for the x86 architecture and aarch64 for the Arm architecture) and click OK. After the client files are packaged and generated, download the client to the local PC as prompted and decompress it.

     For example, if the client file package is FusionInsight_Cluster_1_Services_Client.tar, decompress it to obtain FusionInsight_Cluster_1_Services_ClientConfig.tar file. Then, decompress FusionInsight_Cluster_1_Services_ClientConfig.tar file to the D:\FusionInsight_Cluster_1_Services_ClientConfig directory on the local PC. The directory name cannot contain spaces.

  2. Go to the client decompression path FusionInsight_Cluster_1_Services_ClientConfig\Yarn\config and obtain the cluster configuration file. The configuration file will be imported to the configuration file directory (usually the conf folder) of the MapReduce sample project.
  3. During application development, if you need to commission the application in the local Windows system, copy the content in the hosts file in the decompression directory to the hosts file of the node where the client is located. Ensure that the local host can communicate correctly with the hosts listed in the hosts file in the decompression directory.
     

     • If the host where the client is installed is not a node in the cluster, configure network connections for the client to prevent errors when you run commands on the client.
     • The local hosts file in a Windows environment is stored in, for example, C:\WINDOWS\system32\drivers\etc\hosts.
• If you use the Linux environment for commissioning, you need to prepare the Linux node where the cluster client is to be installed and obtain related configuration files.
  1. Install the client on the node. For example, the client installation directory is /opt/client.

     Ensure that the difference between the client time and the cluster time is less than 5 minutes.

     For details about how to use the client on a Master or Core node in the cluster, see Using an MRS Client on Nodes Inside a Cluster. For details about how to install the client outside the MRS cluster, see Using an MRS Client on Nodes Outside a Cluster.

  2. Log in to the FusionInsight Manager portal. Download the cluster client software package to the active management node and decompress it. Then, log in to the active management node as user root. Go to the decompression path of the cluster client and copy all configuration files in the FusionInsight_Cluster_1_Services_ClientConfig\Yarn\config directory to the conf directory where the compiled JAR package is stored for subsequent commissioning, for example, /opt/client/conf.

     For example, if the client software package is FusionInsight_Cluster_1_Services_Client.tar and the download path is /tmp/FusionInsight-Client on the active management node, run the following command:

     cd /tmp/FusionInsight-Clien

     tar -xvf FusionInsight_Cluster_1_Services_Client.tar

     tar -xvf FusionInsight_Cluster_1_Services_ClientConfig.tar

     cd FusionInsight_Cluster_1_Services_ClientConfig

     scp Yarn/config/* root@IP address of the client node:/opt/client/conf

     The keytab file obtained during the Preparing MRS Application Development User is also stored in this directory.

  3. Check the network connection of the client node.

     During the client installation, the system automatically configures the hosts file on the client node. You are advised to check whether the /etc/hosts file contains the host names of the nodes in the cluster. If no, manually copy the content in the hosts file in the decompression directory to the hosts file on the node where the client resides, to ensure that the local host can communicate with each host in the cluster.