Preparing the Configuration Files for Connecting to the Cluster

Preparing the Configuration Files of the Running Environment

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. 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.

Scenario 1: Prepare the configuration files required for debugging in the local Windows development environment.

Log in to FusionInsight Manager and choose Cluster > Dashboard > More > Download Client. Set Select Client Type to Configuration Files Only. 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 configuration file package is FusionInsight_Cluster_1_Services_Client.tar, decompress it to obtain FusionInsight_Cluster_1_Services_ClientConfig_ConfigFiles.tar. Then, decompress FusionInsight_Cluster_1_Services_ClientConfig_ConfigFiles.tar

Go to HBase\config in the directory where the client configuration file is decompressed and obtain the configuration files listed in Table 1.

**Table 1** Configuration files
File	Description
core-site.xml	Hadoop Core parameters
hbase-site.xml	HBase parameters
hdfs-site.xml	HDFS parameters

For details about how to obtain the configuration files required for accessing the sample project for developing an HBase ThriftServer application, see Preparing the ThriftServer Instance Configuration Files.

Copy the hosts file content from the decompression directory to the hosts file of the local PC.
- If you need to debug the application in the local Windows environment, ensure that the local PC can communicate with the hosts listed in the hosts file.
- If your PC cannot communicate with the network plane where the MRS cluster is deployed, you can bind an EIP to access the MRS cluster. For details, see HBase of the Cluster in Normal Mode Access Configuration on Windows Using EIPs.
- The local hosts file in a Windows environment is stored in, for example, C:\WINDOWS\system32\drivers\etc\hosts.

Scenario 2: Prepare the configuration files required for running the program in a Linux environment.
1. Install the MRS cluster client on the node.
  For example, the client installation directory can be /opt/client.
2. Obtain the configuration files.
  1. Log in to FusionInsight Manager and choose Cluster > Dashboard > More > Download Client. Set Select Client Type to Configuration Files Only. 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), select Save to Path, and click OK. Download the client configuration file to the active OMS node of the cluster.
  2. Log in to the active OMS node as user root, go to the directory where the client configuration file is stored (/tmp/FusionInsight-Client/ by default), decompress the software package, and obtain the configuration files listed in Table 1 from the HBase/config directory.
    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 OMS node, run the following commands:
    
    cd /tmp/FusionInsight-Client
    
    tar -xvf FusionInsight_Cluster_1_Services_Client.tar
    
    tar -xvf FusionInsight_Cluster_1_Services_ClientConfig_ConfigFiles.tar
    
    cd FusionInsight_Cluster_1_Services_ClientConfig_ConfigFiles
    
    For details about how to obtain the configuration files required for accessing the sample project for developing an HBase ThriftServer application, see Preparing the ThriftServer Instance Configuration Files.
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 of the hosts file in the decompression directory to the hosts file on the node where the client is located, to ensure that the local host can communicate with each host in the cluster.

Preparing the ThriftServer Instance Configuration Files

To access HBase ThriftServer and perform table-related operations, perform the following steps to obtain the configuration files:

Log in to FusionInsight Manager, choose Cluster > Services > HBase > Configuration and click All Configurations, search for and modify the parameter hbase.thrift.security.qop of the ThriftServer instance. The value of this parameter must be the same as that of hbase.rpc.protection. Save the configuration and restart the node service for the configuration to take effect.
The mapping between hbase.rpc.protection and hbase.thrift.security.qop is as follows:
- "privacy" - "auth-conf"
- "authentication" - "auth"
- "integrity" - "auth-int"
Obtain the ThriftServer instance configuration files.
- Method 1: Choose Cluster > Services > HBase and click the Instances tab. Click the target ThriftServer instance. In the Configuration File area on the Dashboard page, click hdfs-site.xml, core-site.xml, hbase-site.xml respectively to obtain the configuration files.
- Method 2: Obtain the configuration files by decompressing the client file in Preparing the Configuration Files of the Running Environment. Add the following configurations to the hbase-site.xml file, and ensure that the value of hbase.thrift.security.qop is the same as that in 1.
```
<property>
<name>hbase.thrift.security.qop</name>
<value>auth</value>
</property>
<property>
<name>hbase.thrift.kerberos.principal</name>
<value>thrift/hadoop.hadoop.com@HADOOP.COM</value>
</property>
<property>
<name>hbase.thrift.keytab.file</name><value>/opt/huawei/Bigdata/FusionInsight_HD_8.1.0.1/install/FusionInsight-HBase-2.2.3/keytabs/HBase/thrift.keytab</value>
```