#Solace

Last updated    - V6 (03-Oct-2025)

Key Concepts

Topic	Sub-Topics	Basic	Intermediate	Advanced	Expert
Introduction	What is Solace, Messaging patterns, Pub/Sub, Queueing, Use cases	✅	✅
Architecture	Solace Message Broker, Components, Clustering, Redundancy	✅	✅	✅
Messaging Concepts	Topics, Queues, Subscriptions, Durable/Non-durable, Guaranteed vs Direct	✅	✅	✅	✅
Producers	Publishing messages, QoS levels, Message properties, API usage	✅	✅	✅	✅
Consumers	Receiving messages, Subscriptions, Queue handling, Event-driven consumption	✅	✅	✅	✅
APIs & SDKs	Solace Java API, JMS API, REST API, MQTT support	✅	✅	✅	✅
Administration	Broker configuration, VPNs, Users & ACLs, Monitoring	✅	✅	✅	✅
Security	Authentication, Authorization, Encryption, ACLs, TLS/SSL	✅	✅	✅	✅
High Availability	Active/Standby, HA clusters, Disaster recovery		✅	✅	✅
Performance & Tuning	Message throughput, Latency optimization, Resource tuning		✅	✅	✅
Advanced Features	Message replay, Guaranteed delivery, Transactional messaging, Event broker routing		✅	✅	✅
Monitoring & Logging	System monitoring, Metrics, Tracing, Alerting	✅	✅	✅	✅
Integration	Microservices, Spring Boot integration, Cloud deployment	✅	✅	✅	✅
Troubleshooting	Common issues, Debugging, Error handling, Logs analysis	✅	✅	✅	✅
Best Practices	Message design, Queue/topic design, Scaling, Security practices	✅	✅	✅	✅

Interview question

Basic

1. What is Solace PubSub+ and what problems does it solve?
2. Explain the difference between queues and topics in Solace.
3. What is a message VPN in Solace?
4. How does Solace support point-to-point messaging?
5. What is publish-subscribe messaging in Solace?
6. Define persistent vs. non-persistent messaging in Solace.
7. What is the role of a client profile in Solace?
8. What is guaranteed delivery in Solace messaging?
9. Explain the difference between direct and guaranteed messages.
10. How do you connect to a Solace broker?
11. What is a Solace session?
12. Explain Solace message acknowledgment modes.
13. What is Solace CLI used for?
14. Define message spooling in Solace.
15. How do you create a queue in Solace?
16. What is the difference between a durable and a non-durable subscription?
17. What protocols are supported by Solace PubSub+?
18. What is the role of the default VPN?
19. How do you publish a message using Solace JCSMP API?
20. What are the basic security features available in Solace?
21. Explain Solace connection retries.
22. What is the role of message TTL (time-to-live)?
23. How do you monitor a Solace broker?
24. What is SolAdmin?
25. What is the difference between static and dynamic subscriptions?

Intermediate

1. Explain topic hierarchy and wildcards in Solace.
2. What are durable topic endpoints (DTE)?
3. How does Solace handle flow control?
4. Explain client-acknowledge mode in Solace.
5. What is the role of replay in Solace PubSub+?
6. How does Solace support load balancing across consumers?
7. What are selectors in Solace queues?
8. How does Solace guarantee once-and-only-once delivery?
9. Explain how Solace supports message filtering.
10. What is Solace JCSMP API and how is it used?
11. How do you configure client authentication in Solace?
12. What is an ACL profile in Solace?
13. How do you configure TLS/SSL for Solace?
14. Explain Solace event broker scaling options.
15. How do you create topic subscriptions in Solace?
16. What is the difference between Solace software broker and appliance?
17. How does Solace support REST-based messaging?
18. What is Solace Spring Cloud Stream binder?
19. How do you use MQTT with Solace?
20. What is Solace?s integration with Apache Kafka?
21. Explain message compression in Solace.
22. How does Solace handle dead message queues (DMQ)?
23. What is Solace?s event mesh?
24. What are Solace?s persistent stores used for?
25. How do you trace a message path in Solace?

Advanced

1. Explain Solace HA architecture.
2. How does Solace implement disaster recovery (DR)?
3. What is a replication bridge in Solace?
4. How do you configure message replay for compliance use cases?
5. What is a multi-node Solace deployment?
6. Explain Solace?s multi-protocol support in a real use case.
7. What are the performance tuning options for Solace appliances?
8. How does Solace ensure zero message loss during failover?
9. What is Solace?s distributed tracing support?
10. Explain the difference between HA and DR in Solace.
11. How does Solace handle back-pressure in high throughput scenarios?
12. What is Solace?s guaranteed messaging store and how does it scale?
13. How do you secure Solace in a multi-tenant environment?
14. Explain Solace PubSub+ Cloud architecture.
15. How do you integrate Solace with cloud-native platforms like Kubernetes?
16. What is the role of Solace REST Delivery Points (RDP)?
17. How does Solace provide interoperability between legacy MQ and cloud-native apps?
18. Explain Solace?s integration with Apache Pulsar or RabbitMQ.
19. How does Solace handle schema evolution in messages?
20. Explain best practices for designing Solace topic hierarchy.
21. How do you optimize message replay performance?
22. What are Solace?s bridging capabilities across multiple data centers?
23. How does Solace enable geo-replication?
24. How do you implement message partitioning in Solace?
25. What are the limits of message size and throughput in Solace?

Expert

1. Design a Solace architecture for global financial trading.
2. How would you migrate from Tibco EMS or IBM MQ to Solace?
3. Explain in detail how Solace implements event-driven microservices.
4. How do you debug performance bottlenecks in Solace clusters?
5. How would you implement event sourcing using Solace replay?
6. Explain hybrid-cloud messaging with Solace.
7. How does Solace handle regulatory compliance requirements (MiFID II, etc.)?
8. What are Solace?s advanced monitoring and observability tools?
9. How would you secure Solace against DDoS attacks?
10. How do you scale Solace in a high-frequency trading system?
11. Explain message deduplication strategies in Solace.
12. How does Solace compare with Apache Kafka in enterprise use cases?
13. Design a DR strategy for a Solace-based architecture spanning regions.
14. How would you tune Solace for ultra-low latency applications?
15. Explain message routing optimization in Solace event mesh.
16. What are the trade-offs between direct messaging and guaranteed messaging in enterprise use cases?
17. How do you integrate Solace with event-driven APIs?
18. How do you ensure observability of Solace in a multi-cloud environment?
19. What is Solace?s role in OpenTelemetry?
20. Explain the impact of schema registry with Solace integration.
21. How would you implement an IoT solution using Solace PubSub+?
22. What are the most challenging troubleshooting issues in Solace production systems?
23. How do you evaluate Solace vs. Confluent Kafka for a given use case?
24. How would you implement a secure multi-tenant SaaS messaging system on Solace?
25. Explain Solace?s future roadmap in the context of event-driven architecture.

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