terrymanu commented on issue #37014:
URL:
https://github.com/apache/shardingsphere/issues/37014#issuecomment-3492324263
Root Cause Analysis
The connection failure you experienced occurs because ShardingSphere needs
to establish a database connection during startup to determine the database
type. This happens in the DatabaseTypeEngine.getStorageType() method,
which calls dataSource.getConnection() to inspect database metadata.
However, this connection check serves a specific purpose: database type
detection, not comprehensive health monitoring of data sources.
ShardingSphere's Design Philosophy: Why It Does Not Manage Data Source
State
ShardingSphere follows the Database Plus design philosophy, positioning
itself as an enhancement layer on top of existing databases rather than a
replacement for database management infrastructure. This design choice is
intentional and follows several important software engineering principles.
Separation of Concerns
ShardingSphere's Core Responsibilities:
- Data sharding and routing
- Read-write separation
- Data encryption and masking
- Distributed transactions
- SQL parsing and execution
Connection Pool Responsibilities:
- Connection lifecycle management
- Health monitoring and failure detection
- Connection pool size management
- Performance optimization
Database Responsibilities:
- Data persistence
- Transaction management
- Storage engine operations
This clear separation ensures that each component focuses on what it does
best, without unnecessary overlap or complexity.
Conclusion
The connection failure you experienced during restart is an infrastructure
issue that should be handled at the container orchestration level, not by
ShardingSphere itself. This is consistent with distributed systems best
practices, where each component maintains clear boundaries and
responsibilities.
In production environments, database connectivity should be managed
through:
- Container orchestration startup dependencies
- Service discovery mechanisms
- Appropriate health checks at the infrastructure level
- Database connection pooling configuration
This design allows ShardingSphere to remain focused on its core mission:
providing powerful data enhancement capabilities while maintaining
architectural simplicity and ecosystem compatibility.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
