Developed the Mariadbannotate ros event

[chungeun-choi]

mariadb-annotate-rows-event

1. Development of 'MariadbAnnotateRowsEvent'

• Developed the MariadbAnnotateRowsEvent class based on the following document
  • Documentation link: https://mariadb.com/kb/en/annotate_rows_event/
  • link to the source code

2. Changes to the Binlogstream Object for MariaDB Replication

• Updated the isMariadb field to check for MariaDB and set the 'mariadb settings' (__set_mariadb_settings) accordingly.

  • Previous behavior: Only checked if the auto_position field existed for MariaDB detection.
  • Updated behavior: Now detects MariaDB even if the auto_position field is not specified.
  • [link to the source code]

• Added the annotate_rows_event field to enable the specific feature.

  • Additional binlog events are triggered when rows event occurs, so the binlogstream object now accepts the annotate_rows_event parameter to activate this feature.
  • Source code:[Source code with parameter defined], [Conditional expression to check '__annotate_rows_event']

3. Test code

• Adding Mariadb Test Service to docker-compose.yml
  • [link yml file]
• Adding TestMariadbBinlogStreamReader Object to base.py
  • [link to the source code]
• Writing Test Code for annotate_rows_event
  • [link to the source code]

[dongwook-chan]

As of MariaDB 10.2.4, the binlog-annotate-row-events is enabled by default, with query strings recorded in the ANNOTATE_ROWS_EVENT. This enhances utility of replication data for users and opens up many use case possibilities. However, given that this event precedes every row event, it may lead to an overload if DML is frequent. But the option for clients to receive this data by adjusting the BinLogStreamReader's annotate_rows_event argument mitigates this. In essence, this implementation is crucial to fully leverage the updated system variable's default value.

[julien-duponchelle]

Thanks !

[chungeun-choi]

I am happy to contribute to the project