Failed to dump data from Tidb serverless from a remote linux server

[Shiyang_WEI]

Application environment:dev

Reproduction method:

tiup dumpling -u 3JePguGPZ9f8CHv.root -P 4000 -h gateway01.ap-southeast-1.prod.aws.tidbcloud.com -r 200000 -o “s3://ab-23-data/advdw”

Problem:

failed to dump data from Tidb serverless from a remote linux server

dev cannot pass the stage

Resource allocation:

Attachment:

[TiDB-AI-Assistant]

To resolve the issue of failing to dump data from TiDB serverless using tiup dumpling, follow these steps:

To resolve the issue of failing to dump data from a TiDB serverless instance using tiup dumpling, follow this detailed step-by-step plan. This plan includes verification of network connectivity, authentication, and specific configurations needed for tiup dumpling.

Step 1: Verify Network Connectivity

1. Check Network Access:

   • Ensure that the Linux server where tiup dumpling is installed can reach the TiDB serverless instance. Use the ping command to test connectivity to the TiDB server’s IP address or hostname.
   • Example: ping <tidb-server-ip>

2. Check Port Accessibility:

   • Ensure that the port used by the TiDB server (default is 4000) is open and accessible from your Linux server.
   • Use telnet or nc (netcat) to test port connectivity.
   • Example: telnet <tidb-server-ip> 4000 or nc -zv <tidb-server-ip> 4000

Step 2: Verify Authentication Credentials

1. Check Username and Password:

   • Ensure you have the correct username and password for the TiDB serverless instance.
   • If using a password, ensure it is correctly specified in the tiup dumpling command with the -p option.

2. Check Certificate Authentication (if applicable):

   • If using TLS/SSL for authentication, ensure you have the correct certificate files (--ca, --cert, --key) and that they are specified in the tiup dumpling command.

Step 3: Verify tiup and dumpling Installation

1. Check tiup Installation:

   • Ensure tiup is installed and available in your PATH.
   • Run tiup --version to verify the installation.

2. Check dumpling Installation:

   • Ensure dumpling is installed via tiup.
   • Run tiup list to check if dumpling is listed.
   • If not installed, run tiup install dumpling.

Step 4: Configure and Run tiup dumpling

1. Basic Command Structure:

   • Use the following command structure to run dumpling:

     tiup dumpling -u <username> -p <password> -h <tidb-server-ip> -P 4000 --filetype sql -t 8 -o /path/to/output
     

2. Adjust Concurrency and File Size:

   • Use the -t option to set the number of threads (e.g., -t 8).
   • Use the -F option to set the maximum file size (e.g., -F 256MiB).

3. Specify Output Directory:

   • Use the -o option to specify the output directory for the dump files.

4. Use Additional Options as Needed:

   • Use --consistency snapshot for consistent snapshots.
   • Use --filter to specify which tables to export.

Step 5: Troubleshoot Common Issues

1. Check Logs:

   • If the dump fails, check the logs for error messages. Use the --logfile option to specify a log file.

2. Adjust TiDB GC Time (if necessary):

   • If you encounter GC-related issues, manually adjust the TiDB GC time:

     SET GLOBAL tidb_gc_life_time = '720h';
     

   • After the dump, reset it to the default value:

     SET GLOBAL tidb_gc_life_time = '10m';
     

3. Verify Permissions:

   • Ensure the user has the necessary privileges: PROCESS, SELECT, RELOAD, LOCK TABLES, and REPLICATION CLIENT.

Step 6: Validate the Export

1. Check Exported Files:

   • Verify that the exported files are present in the specified output directory.
   • Check the file sizes and contents to ensure data integrity.

2. Test Import (Optional):

   • Optionally, test importing the data into another TiDB instance to ensure the dump was successful.

By following these steps, you should be able to resolve issues related to dumping data from a TiDB serverless instance using tiup dumpling. If problems persist, consider reaching out to TiDB support or consulting the official documentation for further assistance.

[Shiyang_WEI]

error msg:
SELECT command denied to user ‘3JePguGPZ9f8CHv.root’@‘%’ for table ‘tidb’,

the command is as below:
tiup dumpling -u 3JePguGPZ9f8CHv.root -P 4000 -h gateway01.ap-southeast-1.prod.aws.tidbcloud.com -r 200000 -o “s3://ab-23-data/advdw” --ca “/etc/pki/tls/certs/ca-bundle.crt” --password ***********

[TiDB-AI-Assistant]

To resolve the ‘SELECT command denied to user’ error when using tiup dumpling with the user ‘3JePguGPZ9f8CHv.root’, follow these steps: To compare the required permissions for tiup dumpling with the current permissions of the user ‘3JePguGPZ9f8CHv.root’, we need to identify the permissions necessary for using tiup dumpling and then check if the current user has these permissions.

Required Permissions for tiup dumpling

Based on the provided data, Dumpling requires certain privileges to access both the upstream and downstream databases. The specific permissions required for Dumpling are not explicitly listed in the provided data, but typically, the following permissions are necessary for data export operations:

1. SELECT: To read data from the source (upstream) database.
2. LOCK TABLES: To ensure data consistency during export.
3. SHOW VIEW: If views are involved in the data export.
4. RELOAD: To perform operations like FLUSH TABLES if needed.

Current Permissions of User ‘3JePguGPZ9f8CHv.root’

The current permissions of the user are not explicitly listed in the provided data. However, the user has access to the following documents related to privilege management and SQL statements in TiDB:

1. SHOW CREATE USER: This document provides information on how to recreate a user using the CREATE USER syntax.
2. Privilege Management: This document details how to manage privileges in TiDB, including granting and revoking privileges.
3. DROP ROLE: This document explains how to remove a role in TiDB.

Identifying Missing Permissions

To determine if any permissions are missing, we need to compare the required permissions for Dumpling with the permissions currently granted to the user. Since the specific permissions of the user are not provided, we will assume that the user may not have all the necessary permissions.

Instructions to Grant Missing Permissions

To grant the necessary permissions to the user ‘3JePguGPZ9f8CHv.root’, you can use the following SQL statements in TiDB:

1. Grant SELECT Permission:

   GRANT SELECT ON *.* TO '3JePguGPZ9f8CHv.root'@'%';
   

2. Grant LOCK TABLES Permission:

   GRANT LOCK TABLES ON *.* TO '3JePguGPZ9f8CHv.root'@'%';
   

3. Grant SHOW VIEW Permission:

   GRANT SHOW VIEW ON *.* TO '3JePguGPZ9f8CHv.root'@'%';
   

4. Grant RELOAD Permission:

   GRANT RELOAD ON *.* TO '3JePguGPZ9f8CHv.root'@'%';
   

Note

• Ensure that the user ‘3JePguGPZ9f8CHv.root’ has the necessary privileges to perform the GRANT operation. If the user does not have the GRANT OPTION, you may need to execute these commands as a user with sufficient privileges, such as root.
• Adjust the database and table specifications in the GRANT statements as needed to limit the scope of the permissions to specific databases or tables if full access is not required.Ensure that the user has the necessary permissions as outlined in the TiDB documentation. For more details, refer to the source_uri.

[shiyuhang0]

1. You can use the --filter flag to exclude the tidb table which you don’t have permission. For example: --filter database.table. See here for more details: Dumpling Overview

2. It is recommended that you use the export service Export Data from TiDB Cloud Serverless to dump data. It provides a more convenient way, and it charges little as it is in beta now.

[Allen_Miu]

You can use --consistency none to bypass the permission issue.