freebsd.org/cgi/man.cgi?query=fail ● Define failpoints by comments ○ gofail enable converts comments to code ○ gofail disable converts code to comments Gofail in TiDB func (txn *tikvTxn) Commit(ctx context will use the same failpoint ● No tools to enable and disable the failpoint automatically ● Code in comments can’t be analyzed by static analysis tools https://github.com/pingcap/failpoint The ideal form

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To Hint syntax in these earlier versions, add the --comments option when starting the client. For example: mysql -h �→ 127.0.0.1 -P 4000 -uroot --comments. 9.3.4.2.1 Syntax Optimizer hints are case insensitive

Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To Hint syntax in these earlier versions, add the --comments option when starting the client. For example: mysql -h �→ 127.0.0.1 -P 4000 -uroot --comments. 9.3.4.2.1 Syntax Optimizer hints are case insensitive insensitive and specified within /*+ ... */ comments follow- ing the SELECT, UPDATE or DELETE keyword in a SQL statement. Optimizer hints are not currently supported for INSERT statements. Multiple hints

Hint syntax in these earlier versions, add the --comments option when starting the client. For example: mysql -h �→ 127.0.0.1 -P 4000 -uroot --comments. 9.3.4.2.1 Syntax Optimizer hints are case insensitive insensitive and specified within /*+ ... */ comments follow- ing the SELECT, UPDATE or DELETE keyword in a SQL statement. Optimizer hints are not currently supported for INSERT statements. Multiple hints if a hint is not applicable. Note: If the comments do not follow behind the specified keywords, they will be treated as common MySQL comments. The comments do not take effect, and no warning is reported

the issue that no log is output when the disk is fully written #3362 * Fix the issue that special comments in DDL statements cause the replication task to stop #3755 * Fix the issue that the service cannot SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To written in mybatis-generator.xml, which is the configuration file for Mybatis Generator. There are comments in the following configuration file to describe how to use it.

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To connect to TiDB using the following command: mysql --host --port 4000 -u root -p --comments You can connect to TiDB using MySQL Shell, which can be used as a command-line tool for TiDB. To

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To connect to TiDB using the following command: mysql --host --port 4000 -u root -p --comments You can connect to TiDB using MySQL Shell, which can be used as a command-line tool for TiDB. To

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To connect to TiDB using the following command: mysql --host --port 4000 -u root -p --comments You can connect to TiDB using MySQL Shell, which can be used as a command-line tool for TiDB. To

SUCCESSFULLY, Enjoy it ^-^ To connect TiDB: mysql --comments --host 127.0.0.1 --port 4001 -u �→ root -p (no password) To connect TiDB: mysql --comments --host 127.0.0.1 --port 4000 -u �→ root -p (no password) Enjoy it ^-^ To connect TiDB: mysql --host 127.0.0.1 --port 4000 -u root -p (no �→ password) --comments To view the dashboard: http://127.0.0.1:2379/dashboard PD client endpoints: [127.0.0.1:2379] To connect to TiDB using the following command: mysql --host --port 4000 -u root -p --comments 336 You can connect to TiDB using MySQL Shell, which can be used as a command-line tool for TiDB