System Designhard
What strategies can you employ to ensure database consistency in a distributed system?
Explain the approaches to maintain data integrity across distributed databases.
Answer
- Use Consensus Algorithms:
- Implement consensus protocols like Paxos or Raft to agree on data changes among distributed nodes.
- Leverage Two-Phase Commit (2PC):
- Ensure that all participants in a transaction agree before committing.
- Eventual Consistency:
- Accept temporary inconsistencies for improved performance, ensuring eventual convergence to a consistent state.
- Distributed Transactions:
- Use tools like Saga patterns for managing long-running transactions across microservices.
- Data Versioning:
- Keep historical versions of data to resolve conflicts and enhance recovery.
- Regular Backups and Monitoring:
- Monitor database states and perform backups to prevent data loss during failures.