How to clickhouse mysql connector work internally?

 How Internally Clickhouse to Mysql connector work

The ClickHouse MySQL Connector is a software component that allows ClickHouse, a columnar database management system, to interact with MySQL databases. The connector acts as a bridge between ClickHouse and MySQL, enabling data transfer and synchronization between the two systems. Here's a high-level overview of how the ClickHouse MySQL Connector works internally:

1. Connection Establishment: The ClickHouse MySQL Connector establishes a connection to both ClickHouse and the MySQL database. It uses the respective client libraries or drivers provided by ClickHouse and MySQL to establish and manage these connections.
2. Schema Discovery: The connector fetches the schema metadata from the MySQL database to understand the structure of tables, columns, data types, and indexes. It retrieves this information through MySQL's information schema or other relevant APIs.
3. Data Replication: The connector continuously monitors the MySQL database for changes, such as new inserts, updates, or deletions in the MySQL tables. It employs various techniques like binary log reading or other replication mechanisms provided by MySQL to capture these changes.
4. Data Transformation: After capturing the changes in MySQL, the connector transforms the data into a format compatible with ClickHouse's columnar storage structure. It performs necessary conversions, such as mapping MySQL data types to ClickHouse data types, handling null values, and applying any required data transformations or filters.
5. Data Loading: The transformed data is then loaded into ClickHouse. The connector uses ClickHouse's native insert methods or APIs to efficiently write the data into ClickHouse tables. It may utilize bulk insert techniques or optimize data loading to ensure efficient and high-performance data transfer.
6. Data Synchronization: The connector maintains synchronization between the MySQL source and ClickHouse destination. It continuously monitors for new changes in MySQL and incrementally replicates them to ClickHouse to keep the data up to date. This process involves tracking the state of replication, managing checkpoints, and handling any potential errors or inconsistencies.
7. Error Handling and Retry Mechanisms: The connector incorporates error handling and retry mechanisms to handle network failures, database unavailability, or other transient errors. It ensures data integrity and consistency by retrying failed operations or applying appropriate error handling strategies.
8. Monitoring and Logging: The ClickHouse MySQL Connector typically provides monitoring and logging capabilities to track the replication process, monitor performance, and troubleshoot any issues. It may expose metrics, logs, or diagnostic information that can be used to monitor the replication status and identify potential bottlenecks or errors.

Overall, the ClickHouse MySQL Connector enables seamless integration between ClickHouse and MySQL databases, allowing data replication and synchronization from MySQL to ClickHouse. It abstracts the complexities of data transformation, replication, and loading, providing a straightforward way to transfer data between the two systems while maintaining data consistency and performance.