Top 6 Load Balancing Algorithms Every Developer Should Know

 

• Static Algorithms
  1. Round robin
  The client requests are sent to different service instances in sequential order. The services are usually required to be stateless.
  
  2. Sticky round-robin
  This is an improvement of the round-robin algorithm. If Alice’s first request goes to service A, the following requests go to service A as well.
  
  3. Weighted round-robin
  The admin can specify the weight for each service. The ones with a higher weight handle more requests than others.
  
  4. Hash
  This algorithm applies a hash function on the incoming requests’ IP or URL. The requests are routed to relevant instances based on the hash function result.

• Dynamic Algorithms
  5. Least connections
  A new request is sent to the service instance with the least concurrent connections.
  
  6. Least response time
  A new request is sent to the service instance with the fastest response time.

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