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When we do technology pre research / business start-up, Functionality is the most important. It's ok if we can run through it. For the most popular C/S architecture, the following architecture is the simplest model that can meet functional requirements:However, with the development of our business, Scalability and high availability will gradual ...

1, Data table advanced operations 1. Clone the table and generate the data records of the data table into a new table Method 1: create table test1 like kfc; #Using the like method, copy the test1 table structure to generate the test2 table insert into test1 select * from kfc； Method 2: create table test2 (select * from kfc); ...

Code address of this series: https://github.com/JoJoTec/spring-cloud-parent To achieve what we mentioned in the previous section: You need to add some logs in the retry and open circuit to facilitate future optimizationIt is necessary to define a retry Exception, and combine it with the circuit breaker to encapsulate the non 2xx respon ...

Concept of average load Average load refers to the average number of processes in the running and non interruptible state of the system per unit time, that is, the average number of active processes, which is not directly related to CPU utilization Runnable state: the so-called runnable state process refers to the process that is using th ...

catalogue one, Cluster and distributed 1. Meaning of cluster 2. Distributed system 3. The difference between cluster and distributed 4. Cluster design 2, Introduction to Linux Virtual Server 1. Introduction to LVS 2. Terms of LVS cluster type 3, Working mode of LVS Cluster 1. LVS-NAT mode (NAT mode) 2. LVS-DR (direct routing) 3. L ...

Code address of this series: https://github.com/JoJoTec/spring-cloud-parent In the previous section, we combed the ideas of realizing Feign circuit breaker and thread isolation. In this section, we will first discuss how to optimize the current load balancing algorithm without looking at the source code implementation (because the sourc ...

preface client -> dns -> cdn(cache) -> server The client accesses dns first and then to the cache, otherwise the traffic is too large to directly access the server. What we need to do is load balancing the server aliyun Client - > DNS - > CDN (CACHE) - > SLB server SLB load balancing layer, that is, load balancing and high av ...

Introduction In a variety of Internet applications, as the site requires more and more hardware performance, response speed, service stability, data reliability, etc., it will be difficult for a single server to undertake all access. In addition to expensive mainframes and dedicated load-splitting devices, companies have another option t ...

This article mainly introduces how to use nsq in nodeJs, and other implementations will be output in subsequent articles. cause Some time ago, I made a node service to generate pdf from web pages. In the process of generating puppeter and canvas, the consumption of memory is relatively large, the generation time of pages with large internal cap ...

Detailed production-level load balancing algorithm Introduction to load balancing Load Balance, the English name for Load Balance, refers to a collection of servers that are symmetrically composed of multiple servers, each of which has an equivalent status and can be served independently without the assistance of other servers.With a load-sh ...