Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "how to deal with emergency after database failure". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

There are multiple data sources in the project, one master and multiple slaves, using druid connection pool, but when database failure is found, druid can not automatically rule out unavailable connections, but can only modify the program. Moreover, even if the failed library is restored, druid will still continue to report errors. Some people say that adding automatic reconnection parameters to the database connection will not work. If the master library fails, it is understandable that the service is unavailable because there is only one master library, but the slave library is generally read-only. If one of the slave libraries fails, can it automatically discover whether the service is available like eureka or zookeeper, and then deal with it accordingly?

The following is a record of how to restore the service after simulating a database failure

1. Slave library failure: remove the library data source directly from the program, and then restart the service

two。 Main library failure: the failure of the main library is a little more troublesome. First of all, you need to check all the Read_Master_Log_Pos synchronized from the library and select the largest one as the master library, then clear the master information of the slave library, configure the slave library to become master, and finally modify the master information of the rest of the slave library. When you are finished, reset the main library in the program, and then restart. The reference to the main library failure is the https://www.cnblogs.com/QicongLiang/p/9959276.html post.

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