A zip file will be downloaded, extract it. Add Spring Web dependency and click on Generate. Go to Spring Initializr and create a new spring boot application as described in the below snapshot.
Let's work on creating the Microservice2. Step 0: Create Microservice2 and run its two instances on ports: 82. We will be using spring tool suite for this example: Ribbon logic will be included in Microservice1 in order to load balance the requests among the two instances of Microservice2. The Microservice2 will be having its two instances running and Microservice1 will call Microservice2. We will create two microservices: Microservice1 and Microservice2. Let's understand Ribbon using an example application. Using Ribbon with Java (Spring) Microservice It supports multiple protocols like HTTP, TCP, UDP etc. We can also define our custom rules as per our needs. In addition to it, it also provides AvailabilityFilteringRule and WeightedResponseTimeRule. Load balancing: It provides client side load balancing functionality.įault tolerance: It can be used to determine whether the servers are up or not and can also detect those servers that are down and hence, ignore them for sending the further requests.Ĭonfigurable load balancing rules: By default ribbon uses RoundRobinRule for distributing requests among servers.
Microservices annotations list software#
The load balancer's logic is mixed up with the microservice code.Īs per official website, Netflix's Ribbon is an Inter Process Communication (remote procedure calls) library with built in client side(software) load balancer and is a part of Netflix Open Source Software (Netflix OSS).These client side load balancers are also known as software load balancers.ĭisadvantages of Client-side load balancing Load balancer's logic is part of the client itself, it holds the list of servers and decides to which server a particular request must be directed to based on some algorithm. The instances of the service are deployed on multiple servers. The network latency increases as the number of hops for the request increases from one to two with the load balancer, one to the load balancer and then another from load balancer to the microservice. Since each microservice will have a separate load balancer, the overall complexity of the system increases and it becomes hard to manage. Server side load balancer acts as a single point of failure as if it fails, all the instances of the microservice becomes inaccessible as only load balancer has the list of servers. It then decides to which server a particular request must be directed to based on some algorithm.ĭisadvantages of Server-side load balancing All the incoming requests traffic firstly comes to this load balancer acting as a middle component.
It is generally a hardware load balancer. In Server-side load balancing, the instances of the service are deployed on multiple servers and then a load balancer is put in front of them. In this article, we will try to explain load balancing and how Netflix's Ribbon can be used for load balancing. Load balancing refers to efficiently distributing the incoming network traffic across a group of backend servers (multiple instances of the service). But if the requests are not distributed among the instances effectively, then horizontal scaling is of no use. We create multiple instances of the service in order to handle the large traffic of requests. It is required in modern day applications to improve user experience in the case of higher traffic for a particular service. One of the most prominent reasons of evolution from monolithic to microservices architecture is horizontal scaling.
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