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ELB already does weighting, directing requests depending instance type and instance load. Can't find where in the docs this is clarified unfortunately. Have wit

by de_dave 13y ago

ELB already does weighting, directing requests depending instance type and instance load. Can't find where in the docs this is clarified unfortunately. Have witnessed this with my own eyes though! Draining is a huge issue for us. Investigating ways to add a secondary layer of balancing behind ELB to help mitigate it, which is completely silly. We shouldn't need to do this. ELB should have supported gracefully terminating connections from Day 1, IMO. Last I heard it was being 'considered'.

crazygringo 13y ago
Docs talk about Availability Zones, but there is zero mention of weighting -- either that it's done, or that it's not done. This is a very strange omission. Googling reveals that balancing is done by counting outstanding requests to each instance: http://stackoverflow.com/questions/15789166/how-amazon-elb-will-distribute-requests-to-amazon-ec2-instances-of-different-ins http://stackoverflow.com/questions/15789166/how-amazon-elb-w... https://forums.aws.amazon.com/message.jspa?messageID=146233 https://forums.aws.amazon.com/message.jspa?messageID=146233
- jeffbarr 13y ago
  > But there is zero mention of weighting It is called WRR (Weighted Round Robin). Here are some docs to get you started: http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/WeightedResourceRecordSets.html http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/Wei...
  - crazygringo 13y ago
    That's for Route 53 (DNS). The subject here is ELB, a different AWS technology.
    - jeffbarr 13y ago
      Yes, indeed! My thinking was that you could use this Route 53 feature to route traffic across several ELBs to accomplish the desired effect.
      - dhendo 13y ago
        Yes, sounds like a good idea (if you have control of the DNS)