Help Center/ MapReduce Service/ Developer Guide (Normal_3.x)/ HDFS Development Guide (Security Mode)/ Preparing an HDFS Application Development Environment/ Preparing an HDFS Application Development and Runtime Environment
Updated on 2024-10-23 GMT+08:00
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Preparing an HDFS Application Development and Runtime Environment

Preparing Development Environment

Table 1 describes the environment required for application development.

Table 1 Development Environment

Preparation

Description

OS
  • Development environment: Windows OS. Windows 7 or later is supported.
  • Operating environment: Windows OS or Linux OS.

If the program needs to be commissioned locally, the running environment must be able to communicate with the cluster service plane network.

JDK installation

Basic configuration for the development and operating environment. The version requirements are as follows:

The server and client support only built-in OpenJDK, version: 1.8.0_272, and therefore a JDK replacement is not allowed.

Customers' applications that need to reference the JAR packages of SDK to run in the application processes support Oracle JDK, IBM JDK, and OpenJDK.
  • For x86 nodes that run clients, the following JDKs can be used:
    • Oracle JDK versions: 1.8
    • IBM JDK versions: 1.8.5.11
  • For nodes that run TaiShan and clients, the following JDK can be used:
    • OpenJDK: 1.8.0_272
NOTE:

The server supports only TLS V1.2 or later to ensure security.

By default, IBM JDK supports only TLS V1.0. If IBM JDK is used, setting com.ibm.jsse2.overrideDefaultTLS to true enables TLS V1.0, V1.1, and V1.2. For details, see https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/com.ibm.java.security.component.80.doc/security-component/jsse2Docs/matchsslcontext_tls.html#matchsslcontext_tls.

IntelliJ IDEA installation and configuration

It is the basic configuration for the development environment. The version must be 2019.1 or other compatible version.

NOTE:
  • If the IBM JDK is used, ensure that the JDK configured in IntelliJ IDEA is the IBM JDK.
  • If the Oracle JDK is used, ensure that the JDK configured in IntelliJ IDEA is the Oracle JDK.
  • If the Open JDK is used, ensure that the JDK configured in IntelliJ IDEA is the Open JDK.
  • Do not use the same workspace and the sample project in the same path for different IntelliJ IDEA programs.

Maven installation

Basic configuration of the development environment for project management throughout the lifecycle of software development.

User development preparation

See Preparing a Developer Account for configuration.

7-zip

Used to decompress .zip and .rar packages. The 7-Zip 16.04 is supported.

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. 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\HDFS\config and manually import the configuration file to the configuration file directory (usually the conf folder) of the HDFS sample project.

      The keytab file obtained during the Preparing a Developer Account is also stored in this directory.

    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/HDFS/config directory and save them to the conf folder of the project code.

      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-Client

      tar -xvf FusionInsight_Cluster_1_Services_Client.tar

      tar -xvf FusionInsight_Cluster_1_Services_ClientConfig.tar

      cd FusionInsight_Cluster_1_Services_ClientConfig

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

      The keytab file obtained during the Preparing a Developer Account is also stored in this directory. Table 2 describes the main configuration files.

      Table 2 Configuration files

      File

      Function

      core-site.xml

      Configures HDFS parameters.

      hdfs-site.xml

      Configures HDFS parameters.

      user.keytab

      Provides HDFS user information for Kerberos security authentication.

      krb5.conf

      Contains Kerberos server configuration information.
      • Different clusters cannot share the same user.keytab and krb5.conf files.
      • The log4j.properties file under the conf directory can be configured based on your needs.
    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.