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doc-exports/docs/dcs/umn/dcs-faq-0730058.html
Chen, Junjie ea05d1a734 DCS UMN Initial Version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Chen, Junjie <chenjunjie@huawei.com>
Co-committed-by: Chen, Junjie <chenjunjie@huawei.com>
2022-12-12 14:07:56 +00:00

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When Does a Master/Standby Switchover Occur?

A master/standby switchover may occur in the following scenarios:

  • A master/standby switchover operation is initiated on the DCS Console.
  • If the master node of a master/standby instance fails, a master/standby switchover will be triggered.

    For example, running commands that consume a lot of resources, such as KEYS commands, will cause CPU usage to spike and as result triggers a master/standby switchover.

  • If you restart a master/standby instance on the DCS console, a master/standby switchover will be triggered.

After a master/standby switchover occurs, you will receive a notification. Check whether the client services are running properly. If not, check whether the TCP connection is normal and whether it can be re-established after the master/standby switchover to restore the services.