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I have heard of the terms "Upstream Services" and "Downstream Services" in general terms but i came across some articles on micro-service architecture where they have used these terms , however i wasn't able to get what an upstream and downstream service in a micro-service based architecture would be ? does someone has a brief explanation ?
I already know that Upstream services are those that do not depend on any other services and downstream services depending on the upstream services for example the front end would be a downstream service to the back end as it depends on it.
I am developing the micro-services in .Net Core.
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Stream – The moving water in a river is called a stream. Upstream – If the boat is flowing in the opposite direction to the stream, it is called upstream. In this case, the net speed of the boat is called the upstream speed. Downstream – If the boat is flowing along the direction of the stream, it is called downstream.
Upstream Versus Downstream In the same way that a raw material provider is “upstream” or “up river” from a factory, a raw data provider is “upstream” from the API that processes it. Similarly, the API which takes the output of another component's processing is considered “downstream” or “down river”.
The downstream services are the ones that consume the upstream service. In particular, they depend on the upstream service. More generally, upstream services don't need to know or care about the existence of downstream services.
downstream in the context of systems. In the case of upstream, we are looking at the application sending the data to another application. On the other hand, in the case of a downstream system, we are seeing that data flow in a different direction. In the case of downstream, we receive data.
Upstream: receiving requests from / sending responses to
Downstream: making requests to / receiving responses from
Upstream: making requests to / receiving responses from
Downstream: receiving requests from / sending responses to
There are resources on the internet which support both of these definitions. Maybe we will resolve this question one day, but for now the answer is: it's either.
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The downstream services are the ones that consume the upstream service. In particular, they depend on the upstream service. More generally, upstream services don't need to know or care about the existence of downstream services. Downstream services care about the existence of upstream services, even if they only optionally consume them.
http://reflectoring.io/upstream-downstream
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I see it is a metaphor of water flow: the origin of a river is upstream, the outlet is downstream.
But in practice it is gibberish. Nowadays services exchange data through different means. A service can call another service to fetch data, it can also call the other service to push data. A service can receive data from another service by calls out first or it can receive data passively, like receiving push notification.
At work, you can use it judiciously: if someone who's more senior than your calls a service upstream service, go with it; if you are the most senior one on the team, name whatever you like.
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Upstream and Downstream in a Production Process
Upstream and Downstream Software Dependencies
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A picture is worth a thousand words !!
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