The new master node is elected and implemented based on the "leader election" method of the Raft algorithm; each master node responsible for processing slots in the cluster has a chance to vote, and the first A slave node that requests a vote from the master node will receive the vote from the master node.
Elect a new master node
The new master node is elected through electionGenerated, implementation of leader election method based on Raft algorithm
Every master node responsible for processing slots in the cluster has a chance to vote, and the first one to vote The slave node that the master node requests to vote will get the vote of the master node
When the slave node finds that the master node it is replicating has entered the offline state, the slave node will broadcast a message to the cluster, All master nodes with voting rights that have received the message are required to vote for this slave node
The master node with voting rights has not yet voted for other nodes, then the master node will respond to the message, indicating that the master node Support slave nodes to become new master nodes
Each slave node participating in the election receives a message and counts how many master nodes it has supported
If the cluster has N master nodes with voting rights, then when a slave node collects 1 support vote greater than or equal to N/2, the slave node will be selected as the new master node
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If the slave node does not collect enough support votes, the cluster will be elected again until a new master node is elected
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