How Failover is Triggered in HA
Warning
SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.
Case 1: The node is experiencing some kind of grey failure and even though a live connection to it exists, it is not answering the heartbeats.
In this case, a heartbeat (ping) is sent every 150 ms and after 200 consecutive heartbeats with no response, there is a failover.
Case 2: The node is refusing the heartbeat connection entirely.
In this case, the connection attempts return an error or time out trying to connect.
See Cluster Management Commands for more details.
Last modified: May 5, 2022