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Wondering which databases are trending in 2019 ? We asked hundreds of developers, engineers, so...

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Stuff The Internet Says On Scalability For October 20th, 2017
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ButterCMS Architecture: a Mission-Critical API Serving Millions of Requests per Month
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Results of some googling over concerns about AWS Elastic Load Balancers' ability to handle 30K+ concurrent requests/sec. Research indicates this is not a problem (depending on how quickly that traffic grows):
http://www.rightscale.com/blog/cloud-management-best-practices/benchmarking-load-balancers-cloud # the canonical benchmark of LBs on AWS
https://harish11g.blogspot.com/2012/07/aws-elastic-load-balancing-elb-amazon.html # see point 4, but this was also 4 years ago
https://www.jayway.com/2015/04/13/600k-concurrent-websocket-connections-on-aws-using-node-js/ # EC2 without ELB, using node.js and kernel tuning
http://blog.flux7.com/blogs/aws/must-know-facts-about-aws-elb
http://shlomoswidler.com/2009/07/elastic-in-elastic-load-balancing-elb.html # testing elasticity in ELB (mostly overlaps with AWS whitepaper below)
https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html # service limits for AWS in general; useful reference
https://aws.amazon.com/articles/1636185810492479 # AWS whitepaper on best practices for evaluating ELB
https://aws.amazon.com/documentation/elastic-load-balancing/ # formal ELB documentation
https://lab.getbase.com/how-we-discovered-limitations-on-the-aws-tcp-stack/
https://coderwall.com/p/__z9ia/scale-php-on-ec2-to-30-000-concurrent-users-server
https://blog.unitedheroes.net/archives/p/4633/how-many-sockets-does-aws-support-anyway/ # AWS EC2 websockets support per instance
tl;dr - ELB is effectively unlimited, but you need to pre-warm the ELB if you are expecting an abrupt spike in traffic (see https://aws.amazon.com/articles/1636185810492479#pre-warming)