Restoring Doris Service Data

Scenarios

Doris data restoration is required in the following scenarios: when data is unexpectedly modified or deleted and requires retrieval; when major Doris operations (such as upgrades or significant adjustments) cause exceptions in system data or fail to achieve the expected result; when all modules fail and become unavailable; and when data is migrated to a new cluster.

Doris service data restoration tasks can be created on FusionInsight Manager. The system supports manual data restoration only.

When executing backup and restoration tasks, you need to manage unified restoration points based on service scenarios to ensure proper service running.

MRS clusters support multiple data path types for restoring Doris service data.

• RemoteHDFS: indicates that data is restored from the HDFS directory of the standby cluster.
• OBS: indicates that data is restored from OBS.

Notes and Constraints

• This section applies only to MRS 3.3.1 or later clusters.
• Data restoration can be performed only when the system version is consistent with the version used during data backup.

Impact on the System

After the data is restored, the data generated after the data backup and before the data restoration is lost.

Prerequisites

• To restore data from a remote HDFS, the following conditions must be met:
  • A standby cluster has been created for data restoration, and its data has been backed up. For details, see Backing Up Doris Data. If the active cluster is deployed in security mode and the active and standby clusters are not managed by the same FusionInsight Manager, mutual trust has been configured. For details, see Configuring Mutual Trust Between MRS Clusters. If the active cluster is deployed in normal mode, mutual trust is not required.
  • At least one DBroker instance of the Doris service has been deployed in the active cluster.
  • Time is consistent between the active and standby clusters, with the NTP services on both clusters configured to use the same time source.
  • The value of hadoop.rpc.protection of Doris must be the same as that of hadoop.rpc.protection of HDFS in both active and standby clusters.

• If you want to restore data from OBS, you have connected the Doris cluster to OBS and have the permission to access OBS.
• The database for storing restored data tables, the location for storing the data tables in HDFS, and the list of users who can access the restored data have been planned.
• Check the path for storing Doris backup files.
• Stop the upper-layer Doris applications.

Restoring Doris Service Data

1. Log in to MRS Manager and choose O&M > Backup and Restoration > Backup Management.

   For details about how to log in to MRS Manager, see Accessing MRS Manager.

2. In the row containing the specified backup task, choose More > View History in the Operation column to display the task's historical execution records.

   In the displayed window, locate the desired success record and click View in the Backup Path column to display the task's backup path information and obtain the following details:

   • Backup Object: indicates the backup data source.
   • Backup Path: indicates the full path where the backup files are stored.

     Locate the correct path, and manually copy the full path of the backup files from the Backup Path column.

3. Choose Restoration Management and click Create.
4. Set Task Name to the name of the restoration task.
5. Select the cluster to be operated from Recovery Object.
6. In Restoration Configuration, select Doris under Service data.
7. Select a backup directory type for Path Type of Doris.

   Table 1 Path for data restoration

   Path Type	Parameter	Description
   RemoteHDFS	Source NameService Name	NameService name of the backup data cluster. You can obtain it from the NameService Management page of HDFS in the standby cluster. For example, the name is hacluster.
   	IP Mode	IP version of the target IP address. The system automatically determines the IP version, such as IPv4 or IPv6, based on the cluster network type.
   	Source NameNode IP Address	Service plane IP address of the NameNode in the standby cluster.
   	Source NameNode RPC Port	Value of dfs.namenode.rpc.port in the HDFS configuration of the standby cluster.
   	DBroker IP	Service plane IP address of the DBroker role in the cluster. The DBroker is used to transmit data during restoration.
   	Source Path	Full path of the HDFS directory storing backup data in the standby cluster. For details, see Backup Path obtained in Step 2. Path format: Backup path/Backup task name_Data source_Task creation time
   OBS	Source Path	Full path of the OBS directory storing backup files. Specify this path by referring to Step 2. Path format: Backup path/Backup task name_Data source_Task creation time/

8. Click Refresh and select a Doris backup file set that has been backed up.
9. In the Data Configuration area, select one or more pieces of backup data for Select Data based on service requirements.

   Configuration restrictions are as follows:

   • There is a database with the same name as the original database of the selected backup data in the Doris of the cluster.
   • The backup data is restored to the backup table with the same name as the original table in the database.
   • If there is a table with the same name in Doris, ensure that the structures of the two tables are the same, including table names, columns, partitions, and materialized views.

10. Set Original Configurations to true, indicating that the configuration of the backup data, such as the number of copies, will be used. If this parameter is set to false, the default configuration is used to create a table.
11. Click OK.
12. In the restoration task list, locate the row containing the created task, and click Start in the Operation column to execute the restoration task.
    • After the restoration is successful, the progress bar is in green.
    • After the restoration is successful, the restoration task cannot be executed again.
    • If the restoration task fails during the first execution, rectify the fault and click Retry to execute the task again.