Backing Up IoTDB Service Data

Scenario

To ensure IoTDB service data security routinely or before a major operation on IoTDB (such as upgrade or migration), you need to back up IoTDB service data. The backup data can be used to recover the system if an exception occurs or the operation has not achieved the expected result, minimizing the adverse impacts on services.

You can create a backup task on FusionInsight Manager to back up IoTDB service data. Both automatic and manual backup tasks are supported.

Prerequisites

Backing Up IoTDB Service Data

1. On FusionInsight Manager, choose O&M > Backup and Restoration > Backup Management.
2. Click Create.
3. Set Name to the name of the backup task.
4. Select the cluster to be operated from Backup Object.
5. Set Mode to the type of the backup task.

   Periodic indicates that the backup task is executed by the system periodically. Manual indicates that the backup task is executed manually.

   Table 1 Periodic backup parameters

   Parameter	Description
   Started	Indicates the time when the task is started for the first time.
   Period	The task execution interval. Value options include Hours and Days.
   Backup Policy	Indicates a periodic backup policy. Full backup at the first time and incremental backup subsequently Full backup every time Full backup once every n times

6. In Configuration, choose IoTDB > IoTDB under Service data.
7. Set Path Type of IoTDB to a backup directory type.

   The following backup directory types are supported:

   RemoteHDFS: indicates that the backup files are stored in the HDFS directory of the standby cluster.

   If you select this option, set the following parameters:

   • Destination NameService Name: indicates the NameService name of the standby cluster, for example, hacluster. You can obtain it from the NameService Management page of HDFS of the standby cluster.

   • IP Mode: indicates the mode of the target IP address. The system automatically selects the IP address mode based on the cluster network type, for example, IPv4 or IPv6.
   • Destination Active NameNode IP Address: indicates the service plane IP address of the active NameNode in the standby cluster.
   • Destination Standby NameNode IP Address: indicates the service plane IP address of the standby NameNode in the standby cluster.
   • Destination NameNode RPC Port: indicates the value of dfs.namenode.rpc.port in the HDFS basic configuration of the standby cluster.
   • Target Path: indicates the HDFS directory for storing standby cluster backup data. The storage path cannot be an HDFS hidden directory, such as a snapshot or recycle bin directory, or a default system directory, such as /hbase or /user/hbase/backup.

8. Set Backup Content to one or multiple service data records to be backed up.

   You can select backup data using either of the following methods:

   • Adding a backup data file
     1. Click Add.
     2. Select the table to be backed up under File Directory, and click Add to add the table to Backup Content.
     3. Click OK.
   • Selecting using regular expressions
     1. Click Query Regular Expression.
     2. Enter the parent directory full path of the directory in the first text box as prompted. The directory must be the same as the existing directory, for example, /root.
     3. Enter a regular expression in the second text box. Standard regular expressions are supported. For example, to get all files or subdirectories in the parent directory, enter ([\s\S]*?). To get files whose names consist of letters and digits, for example, file1, enter file\d*.
     4. Enter a regular expression in the second text box. Standard regular expressions are supported. For example, to get objects containing test, enter .*test.*. To get objects starting with test, enter test.*. To get objects ending with test, enter .*test.
     5. Click Refresh to view the displayed directories in Directory Name.
     6. Click Synchronize to save the result.
     

     • When entering regular expressions, click or to add or delete an expression.
     • If the selected table or directory is incorrect, click Clear Selected Node to deselect it.
     • The backup directory cannot contain files that have been written for a long time. Otherwise, the backup task will fail. Therefore, you are not advised to perform operations on the top-level directory, such as /user, /tmp, and /mr-history.

9. Click Verify to check whether the backup task is configured correctly.

   The possible causes of the verification failure are as follows:

   • The target NameNode IP address is incorrect.
   • The data to be backed up does not exist.

10. Click OK.
11. In the Operation column of the created task in the backup task list, click More and select Back Up Now to execute the backup task.

    After the backup task is executed, the system automatically creates a subdirectory for each backup task in the backup directory. The format of the subdirectory name is Backup task name_Data source_Task creation time, and the subdirectory is used to save latest data source backup files. All the backup file sets are stored in the related snapshot directories.