Hot Spot
An uneven distribution of load where one node, shard, or partition receives disproportionately more traffic than others. Caused by poor shard keys or skewed access patterns.
What is Hot Spot?
An uneven distribution of load where one node, shard, or partition receives disproportionately more traffic than others. Caused by poor shard keys or skewed access patterns.
Hot Spot is a advanced concept that sits in the Distributed Systems Core area of system design. Engineers reach for it whenever they need to reason about real-world trade-offs in that space — not just for textbook correctness, but because real production systems at companies like Netflix, Amazon, and Google make these decisions every day.
If you want to go deeper than this definition — with diagrams, code, and a quiz to lock it in — work through the "Hot Spot" lesson linked below. It walks through the why, the mechanism, the trade-offs, and how the giants actually use it in production.
Learn Hot Spot in depth
Full interactive lesson with diagrams, code examples, real-world references, and a quiz.
Open the Hot Spot lessonSee also
Related glossary terms you might want to look up next.
Shard Key
The column or field used to determine which shard a piece of data belongs to. A bad shard key creates hot spots; a good one distributes data and queries evenly.
Consistent Hashing
A hashing technique where adding or removing servers only moves a small fraction of keys. Used by Amazon DynamoDB and Cassandra for data distribution.
Load Balancer
Distributes incoming traffic across multiple servers so no single server gets overwhelmed. Like a traffic cop directing cars to different lanes.