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Code Block
A             B             C
5(A) -------> 5(A) -------> 5(A) # 5(A) means PID:5, source cluster:A
              CB   ---------> CB   # Control Batch appended when A failover to B
              5(B) -------> 5(B) # In B and C, even if 2 records with PID 5, they won't duplicate with each other because of the control batch.

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