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This article is to share with you about Apollo high availability design analysis, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

High availability is one of the factors that must be considered in the design of distributed system architecture. it usually refers to reducing the time when the system can not provide services through design.

Apollo has put a lot of effort into high-availability design, so let's take a brief analysis:

1) some Config Service is offline.

No impact, Config Service can deploy multiple nodes.

2) all Config Service offline

All Config Service offline will affect the use of the client and cannot read the latest configuration. You can make the transition by reading a locally cached configuration file.

3) some Admin Service is offline.

No impact, Admin Service can deploy multiple nodes.

4) all Admin Service offline

Admin Service serves Portal. After all Admin Service goes offline, it will only affect the operation of Portal, not the client, which relies on Config Service.

5) some Portal is offline.

Multiple Portal can be deployed, and the load can be done through Nginx. The usage of a certain server will not be affected after it goes offline.

6) all Portal offline

There is no effect on the client reading the configuration, but it cannot be viewed or modified through Portal.

7) Database downtime

When the configured database goes down, it has no impact on the client, but it will cause the configuration to not be updated in Portal. When the client restarts, if you need to pull the configuration again, it will have an impact. You can use the option of enabling configuration cache to avoid the impact of database downtime.

The above is what the Apollo high availability design analysis is like, and the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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