Simply speaking, end users expect to read & post tweets with a very fast response time and, Twitter is expected to respond in that manner irrespective of load arriving at it with absolutely no room for any slowness, whatsoever. That is a tough one, isn’t it? This is unlike many enterprise business systems where users can be a little forgiving by waiting for the response to show up. So, they needed to have a load testing system which can generate constant transaction load by sending multiple requests simultaneously (based on Little’s law and not concurrent requests) in a floating manner with appropriate given service latency, without really waiting for any response. Simply speaking, what is needed was to model a system where requests arrive independently of the service’s ability to handle them. For example, a fixed load of 100K requests per minute, if required.
Iago is a load generator tool created by Twitter Engineering team (with moto as Built By Engineers, Built for Engineers) to load tests their 100+ services/APIs which are accessed by clients (users, internal services) using Http, Thrift, UDP & other protocols. At architecture level, Iago consists of feeders and servers. A feeder reads the transaction source. A server formats and delivers requests to the service one wants to test.
Following are some of the key characteristics of Iago:
If you wanted to do stress testing of your web application, Iago may not be a good fit. You may want to consider other load testing tools for that purpose.
Iago shines when you want to test APIs under load. As per this page, Iago is a best fit for testing API under load. Following are some of reasons:
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