Verifying Data Migrated Between MRS Doris Clusters or from CDH or EMR to MRS Doris

Preparations

Install Edge, an MgC tool used for data verification, in the source intranet environment and register an account for using Edge. For details, see Installing Edge for Linux.

Procedure

1. Sign in to the MgC console. On the Overview page, click Create Migration Project.

   

2. In the displayed dialog box, enter a project name, select a project type, and click Confirm.
   

   To review this migration project, choose Settings > Migration Projects in the navigation pane.

   

3. Connect Edge to MgC. For more information, see Connecting the Edge Device to MgC.
4. After the connection is successful, add the username/passwords for accessing the source and target executors to Edge. For more information, see Adding Resource Credentials.
   

   If the source MRS Hive cluster is secured (with Kerberos authentication enabled), add the Hive Metastore credential. You need to set Type to Big Data - Hive Metastore and Authentication to Username/Key. Upload the core-site.xml, hivemetastore-site.xml, hive-site.xml, krb5.conf, and user.keytab files. For details about how to obtain the certificate file, see How Do I Obtain the Hive Metastore Credential Files?

5. On the MgC console, in the navigation pane on the left, choose Research > Data Lineage. In the upper left corner of the page, choose the migration project created in step 2.

   

6. In the Metadata Collection area, click Create Connection.

   

7. On the Select Connection Type page, select Hive Metastore and click Next.

   

8. Configure the parameters for creating a Hive Metastore connection, and click Test. If the test is successful, the connection is set up.

   Table 1 Parameters for creating a Hive Metastore connection

   Parameter	Configuration
   Connection Source	Select Source.
   Connection Name	The default name is Hive-Metastore-4 random characters (including letters and numbers). You can also customize a name.
   Edge Device	Select the Edge device connected to MgC in step 3.
   Secure Connection	Decide whether to enable secure connection. If Hive Metastore is deployed in an unsecured cluster, do not enable secure connection. If Hive Metastore is deployed in a secured cluster, enable secure connection and provide access credentials. Select the source Hive Metastore credential added to Edge in step 4.
   Hive Version	Select the Hive version at the source.
   Hive Metastore IP Address	Enter the IP address for connecting to the Hive Metastore node.
   Hive Metastore Thrift Port	Enter the port for connecting to the Hive Metastore Thrift service. The default port is 9083.

9. In the Metadata Collection area, choose Create Task > Metadata Collection.

   

10. Configure the parameters for creating a metadata collection task and click Confirm.

    

    Table 2 Parameters for configuring a metadata collection task

    Parameter	Configuration
    Task Name	The default name is Metadata-Collection-4 random characters (including letters and numbers). You can also specify a name.
    Metadata Connection	Select the connection created in step 8.
    Databases (Optional)	Enter the names of the databases whose metadata needs to be collected. If no database name is specified, the metadata of all databases is collected.
    Concurrent Threads	Set the maximum number of threads for executing the collection. The default value is 3. The value ranges from 1 to 10. More concurrent threads means more efficient collection, but more connection and Edge device resources will be consumed.

11. In the Metadata Collection area, click Collection tasks.

    

12. On the Tasks tab page, you can review the created metadata collection task and its settings. Click Execute Task in the Operation column to run the task. Each time the task is executed, a task execution is generated.

    

13. Click View Executions in the Operation column. Under Task Executions, you can view the execution records of the task and the status and collection results of each task execution. When a task execution enters a Completed status and the collection results are displayed, you can view the list of databases and tables extracted from collected metadata on the Tables tab page.

    

14. In the navigation pane on the left, choose Migrate > Big Data Verification. If this is your first time to visit this page, select an Edge device to enable the verification feature. Click Select Edge Device. In the displayed dialog box, select the Edge device connected to MgC in step 3.

    

    

    Ensure that the selected Edge device is always Online and Enabled before your verification is complete.

15. In the Features area, click Table Management.

    

16. Under Table Groups, click Create. Configure the parameters for creating a table group and click Confirm.

    

    Table 3 Parameters for creating a table group

    Parameter	Description
    Table Group	Enter a name.
    Metadata Connection	Select the connection created in step 8. CAUTION: A table group can only contain tables coming from the same metadata source.
    Verification Rule	Select a rule that defines the method for verifying data consistency and the inconsistency tolerance. You can View More to see the details about the verification rules provided by MgC.
    Description (Optional)	Enter a description to identify the table group.

17. On the Table Management page, click the Tables tab, select the data tables to be added to the same table group, and choose Option > Add Tables to Group above the list. In the displayed dialog box, select the desired table group and click Confirm.

    

    

    You can manually import information of incremental data tables to MgC. For details, see Creating a Table Group and Adding Tables to the Group.

18. Create a connection to the source and target executors separately. For details, see Creating an Executor Connection. Select the source and target executor credentials added to Edge in step 4.
19. Create a data verification task for the source and target Hive clusters, respectively, and execute the tasks. For more information, see Creating and Executing Verification Tasks. During the task creation, select the table group created in step 16.
    • On the Select Task Type page, choose Hive.

      

    • Select a verification method. For details about each verification method, see Verification Methods.

20. Wait until the task executions enter a Completed status. You can view and export the task execution results on the Verification Results page. For details, see Viewing and Exporting Verification Results.