Q1. How do you scale a Node.js application across CPU cores?
Node runs JavaScript on a single thread, so scaling options are: - Cluster module or a process manager (PM2) to fork one process per core behind a shared port. Good for t...
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Q2. How do Kafka consumer groups enable scaling?
A consumer group is a set of consumers that cooperatively consume a topic. Kafka assigns each partition to exactly one consumer in the group, so the group as a whole proc...
Q3. How does sharding work in MongoDB?
Sharding horizontally partitions a collection across mongos routers and shards. You choose a shard key, and MongoDB splits the key space into chunks distributed and balan...
Q4. How does the Horizontal Pod Autoscaler work?
The Horizontal Pod Autoscaler, or HPA, scales the number of Pod replicas based on observed metrics. - The metrics-server, or a custom or external adapter, supplies metric...
Q5. How does Redis Cluster provide horizontal scaling?
Redis Cluster shards data across nodes using 16384 hash slots. Each key maps to a slot via CRC16(key) mod 16384, and slots are assigned to masters. Clients may query any ...
Q6. How would you scale Scrum across multiple teams?
Scaling Scrum is a problem of coordination, not of adding more Scrum. The first question is whether scaling is needed, because more layers often slow delivery. I keep tea...