Data Consistency During Failover and Multi Region Replication Questions
Handling consistency challenges when failing over between regions. Understand synchronous replication (slower, consistent) vs. asynchronous replication (faster, potential data loss). Discuss split-brain scenarios (if communication between regions breaks, how do you prevent two independent systems each thinking they're the primary?). At Staff level, show understanding of tradeoffs and practical operational considerations.
MediumSystem Design
0 practiced
Design a multi-region read strategy that provides low read latency and strong read-after-write consistency for users who may move between regions frequently (e.g., mobile users traveling). Describe caching, write-forwarding, session tokens, and the trade-offs in latency, availability, and complexity.
HardSystem Design
0 practiced
Design a robust fencing mechanism that works across heterogeneous systems in your stack: Kubernetes leader pods, a relational DB primary, and a message queue leader. Address atomicity of fencing, cross-system ordering guarantees, failure modes, and automated recovery procedures.
MediumTechnical
0 practiced
You're using etcd clusters in each region for leader election and metadata. Explain a safe, automated procedure to migrate leadership and primary responsibilities from RegionA to RegionB for planned maintenance, detailing steps to avoid split-brain, how to drain traffic, update leases, validate application-level consistency, and automate rollback if the migration fails.
EasyTechnical
0 practiced
Explain read-after-write consistency (read-your-writes) for multi-region services. Provide two architecture patterns an SRE can implement to achieve read-after-write across regions (for example: session affinity with local cache invalidation; write-forwarding to primary) and discuss the operational trade-offs for each.
EasyTechnical
0 practiced
What are CRDTs (Conflict-free Replicated Data Types) and vector clocks? As an SRE, when would you recommend using CRDTs for multi-region conflict resolution? Provide a simple example (e.g., counters or sets), and discuss limitations and operational costs.
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