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What is a split brain

2022-08-07 19:38:00 【Cloud full of notes】

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1. Split Brain

1. Split Brain

Split-brain refers to the fact that during the master-slave switchover, due to incomplete switchover or other reasons, the client and the slave mistakenly think that there are two active masters, which eventually makes the entire cluster in a chaotic state.To solve the split-brain problem, the Fencing mechanism is usually adopted, which includes three aspects:

Shared storage fencing: Make sure that only one Master writes data to the shared storage.
Client fencing: Make sure that only one Master can respond to the client's request.
Slave fencing: Ensures that only one Master can issue commands to Slave.

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