Daily Level-Up
25 lessons · System Design
Latest
- 2026-06-28Epoch-Based Leader Leases: Cutting Stale-Read Risk Without a Round-TripSystem Design · Consistency & Replication
- 2026-06-27Saga Pattern: Coordinating Multi-Service Transactions Without Two-Phase CommitSystem Design · Consistency & Replication
- 2026-06-26Two-Phase Commit: Coordinating Atomic Writes Across Multiple NodesSystem Design · Consistency & Replication
- 2026-06-25Fencing Tokens: Preventing Split-Brain Writes When a Lock Holder Comes Back LateSystem Design · Consistency & Replication
- 2026-06-24Lease-Based Reads: Avoiding Stale Data Without Asking Every ReplicaSystem Design · Consistency & Replication
System Design
Caching
Consistency & Replication
- 2026-06-28Epoch-Based Leader Leases: Cutting Stale-Read Risk Without a Round-Trip
- 2026-06-27Saga Pattern: Coordinating Multi-Service Transactions Without Two-Phase Commit
- 2026-06-26Two-Phase Commit: Coordinating Atomic Writes Across Multiple Nodes
- 2026-06-25Fencing Tokens: Preventing Split-Brain Writes When a Lock Holder Comes Back Late
- 2026-06-24Lease-Based Reads: Avoiding Stale Data Without Asking Every Replica
- 2026-06-23Causal Consistency: Preserving "Happens-Before" Without Full Serialization
- 2026-06-22Anti-Entropy with Merkle Trees: Syncing Replicas Without Comparing Every Record
- 2026-06-21Hinted Handoff: Remembering Writes for Nodes That Were Away
- 2026-06-20Read Repair: Healing Stale Replicas on the Fly
- 2026-06-19Monotonic Read Consistency: Preventing Time from Running Backwards
- 2026-06-18Sloppy Quorums: Staying Available When Your Cluster Partially Fails
- 2026-06-14Change Data Capture: Streaming Every Write Without Touching Your Application Code
- 2026-06-11Gossip Protocol: How Distributed Nodes Reach Agreement Without a Leader
- 2026-06-10Vector Clocks: Tracking Causality Without a Central Clock
- 2026-06-09Quorum Reads & Writes: Tunable Consistency Without a Single Master
- 2026-06-07Read-Your-Writes Consistency: Guaranteeing You See Your Own Changes
Partitioning & Hashing
Storage & Indexing
- 2026-06-17Fractional Cascading: Slashing Repeated Binary Search Across Sorted Lists
- 2026-06-16Copy-on-Write B-Trees: Crash Safety Without a Write-Ahead Log
- 2026-06-15Skip Lists: Probabilistic Indexing Without Tree Rebalancing
- 2026-06-13Bitmap Indexes: Crushing Analytical Queries With Bitwise Math
- 2026-06-12Bloom Filters: Skipping Disk Reads You Know Will Miss
- 2026-06-08LSM Trees: Why Write-Heavy Databases Abandon B-Trees
- 2026-06-07Write-Ahead Logging (WAL): Durability Without Sacrificing Speed