Creating an MRS Hive Link¶
MRS Hive links are applicable to the MapReduce Service (MRS). This tutorial describes how to create an MRS Hive link.
Prerequisites¶
You have created a CDM cluster.
You have obtained the Manager IP address, and administrator account and password of the MRS cluster, and the account has the permissions to import and export data.
The MRS cluster and the CDM cluster can communicate with each other. The following requirements must be met for network interconnection:
If the CDM cluster and the cloud service are in different regions, a public network or a dedicated connection is required for enabling communication between the CDM cluster and the cloud service. If the Internet is used for communication, ensure that an EIP has been bound to the CDM cluster, the host where the data source is located can access the Internet, and the port has been enabled in the firewall rules.
If the CDM cluster and the cloud service are in the same region, VPC, subnet, and security group, they can communicate with each other by default. If they are in the same VPC but in different subnets or security groups, you must configure routing rules and security group rules. For details about how to configure routing rules, see "Adding a Custom Route" in Virtual Private Cloud (VPC) Usage Guide. For details about how to configure security group rules, see "Security Group" > "Adding a Security Group Rule" in Virtual Private Cloud (VPC) Usage Guide.
The cloud service instance and the CDM cluster belong to the same enterprise project. If they do not, you can modify the enterprise project of the workspace.
Creating an MRS Hive Link¶
On the Cluster Management page, locate a cluster and click Job Management in the Operation column. On the displayed page, click the Links tab and then Create Link.
Figure 1 Selecting a connector type¶
Select MRS Hive and click Next to configure parameters for the MRS Hive link.
Click Show Advanced Attributes to view more optional parameters. Retain their default values. The following table lists the mandatory parameters.
Table 1 MRS Hive link parameters¶ Parameter
Description
Example Value
Name
Link name, which should be defined based on the data source type, so it is easier to remember what the link is for
hivelink
Manager IP
Floating IP address of MRS Manager. Click Select next to the Manager IP text box to select an MRS cluster. CDM automatically fills in the authentication information.
127.0.0.1
Authentication Method
Authentication method used for accessing MRS
SIMPLE: Select this for non-security mode.
KERBEROS: Select this for security mode.
SIMPLE
HIVE Version
Set this to the Hive version on the server.
HIVE_3_X
Username
If Authentication Method is set to KERBEROS, you must provide the username and password used for logging in to MRS Manager. If you need to create a snapshot when exporting a directory from HDFS, the user configured here must have the administrator permission on HDFS.
To create a data connection for an MRS security cluster, do not use user admin. The admin user is the default management page user and cannot be used as the authentication user of the security cluster. You can create an MRS user and set Username and Password to the username and password of the created MRS user when creating an MRS data connection.
Note
If the CDM cluster version is 2.9.0 or later and the MRS cluster version is 3.1.0 or later, the created user must have the permissions of the Manager_viewer role to create links on CDM. To perform operations on databases, tables, and columns of an MRS component, you also need to add the database, table, and column permissions of the MRS component to the user by following the instructions in the MRS documentation.
If the CDM cluster version is earlier than 2.9.0 or the MRS cluster version is earlier than 3.1.0, the created user must have the permissions of Manager_administrator or System_administrator to create links on CDM.
A user with only the Manager_tenant or Manager_auditor permission cannot create connections.
cdm
Password
Password used for logging in to MRS Manager
-Enable ldap
This parameter is available when Proxy connection is selected for Connection Type.
If LDAP authentication is enabled for an external LDAP server connected to MRS Hive, the LDAP username and password are required for authenticating the connection to MRS Hive. In this case, this option must be enabled. Otherwise, the connection will fail.
No
ldapUsername
This parameter is mandatory when Enable ldap is enabled.
Enter the username configured when LDAP authentication was enabled for MRS Hive.
-ldapPassword
This parameter is mandatory when Enable ldap is enabled.
Enter the password configured when LDAP authentication was enabled for MRS Hive.
-OBS storage support
The server must support OBS storage. When creating a Hive table, you can store the table in OBS.
No
AK
This parameter is mandatory when OBS storage support is enabled. The account corresponding to the AK/SK pair must have the OBS Buckets Viewer permission. Otherwise, OBS cannot be accessed and the "403 AccessDenied" error is reported.
You need to create an access key for the current account and obtain an AK/SK pair.
Log in to the management console, move the cursor to the username in the upper right corner, and select My Credentials from the drop-down list.
On the My Credentials page, choose Access Keys, and click Create Access Key. See Figure 2.
Figure 2 Clicking Create Access Key¶
Click OK and save the access key file as prompted. The access key file will be saved to your browser's configured download location. Open the credentials.csv file to view Access Key Id and Secret Access Key.
Note
Only two access keys can be added for each user.
To ensure access key security, the access key is automatically downloaded only when it is generated for the first time and cannot be obtained from the management console later. Keep them properly.
-SK
-Run Mode
This parameter is used only when the Hive version is HIVE_3_X. Possible values are:
EMBEDDED: The link instance runs with CDM. This mode delivers better performance.
Standalone: The link instance runs in an independent process. If CDM needs to connect to multiple Hadoop data sources (MRS, Hadoop, or CloudTable) with both Kerberos and Simple authentication modes, Standalone prevails.
Note
The STANDALONE mode is used to solve the version conflict problem. If the connector versions of the source and destination ends of the same link are different, a JAR file conflict occurs. In this case, you need to place the source or destination end in the STANDALONE process to prevent the migration failure caused by the conflict.
EMBEDDED
Check Hive JDBC Connectivity
Whether to check the Hive JDBC connectivity
No
Use Cluster Config
You can use the cluster configuration to simplify parameter settings for the Hadoop connection.
No
Cluster Config Name
This parameter is valid only when Use Cluster Config is set to Yes. Select a cluster configuration that has been created.
For details about how to configure a cluster, see "DataArts Migration" > "Managing Links" > "Managing Cluster Configurations" in User Guide.
hive_01
Note
Click Show Advanced Attributes, and then click Add to add configuration attributes of other clients. The name and value of each attribute must be configured. You can click Delete to delete no longer used attributes.
Click Save to return to the Linkspage.