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For more information, refer to Online Verification
Split-brain detection
In case the event of an unintended and unusual situations abnormal situation during replication operations, measures are required to protect the data on the source side. Among them, if a primary becomes a secondary it becomes the 2 primary at some point after disconnection (spli-brain) at some point after disconnection, potentially causing data loss, it should must be automatically detected and acted upon to block replication, a feature called split-brain detection. For For more information about this, see Split-brain in Troubleshooting.
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