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Lessons (14)

• Deployments, ReplicaSets & Rollouts

  … A Deployment is that shift manager for your pods.  Deployment → ReplicaSet …

• Brokers, Replication & Durability

  … Brokers, leaders and followers, in-sync replicas, min.insync.replicas, leader election and KRaft, drawn step by step …

• Replication, Partitioning & Sharding

  Scale reads with replicas, split data safely with partitions and shards, and plan for consistency, hot keys and …

• Database Internals, Replication and Scaling

  … Replicas increase read capacity but add lag; route read-your-own-write flows carefully. Connection pools bound database …

• Storage Engines & Database Operations

  … replicas provide recoverability](/img/database/storage-operations.svg) Mechanism Strength Cost to remember --- --- --- B-tree Point/range reads …

• Kafka Producers

  … acks=all (with min.insync.replicas=2) P- L: send batch L- L: write to log F1- L …

• Scaling, Load Balancing & Rate Limiting

  … Copy the data to replicas and send reads there. mermaid flowchart LR App -- writes P[(Primary)] P -- replication …

• Helm, kubectl Cheat Sheet & Best Practices

  … Production checklist for every workload mermaid mindmap root((Production-ready workload)) Reliability 2+ replicas readiness + liveness probes PodDisruptionBudget …

• Kubernetes Cluster Architecture

  … apply Deployment (replicas: 3) A- E: store desired state C- A: watch: new Deployment → create ReplicaSet → create 3 …

• Scaling & Health Probes

  … 3 restart after ~30s of failures readinessProbe: httpGet: { path: /health/ready, port: 3000 } periodSeconds: 5 failureThreshold: 2 js …

• SQL vs NoSQL Databases

  … SQL databases can scale out too (read replicas, Citus, Vitess, CockroachDB), but it's more work. ACID vs …

• ConfigMaps, Secrets & Storage

  … CephFS ReadWriteOncePod Exactly one pod Strict single-writer workloads StatefulSets and storage A StatefulSet gives each replica its …

• ACID, Transactions & Locks

  … Dirty read Read data another transaction may roll back Read committed or stronger Non-repeatable read Same row …

• Caching & Redis

  … Cache-aside (lazy loading) ⭐ most common The app checks the cache first; on a miss it reads the …