A master node automatically synchronizes updates to the corresponding replica node. However, the updates on the replica node may lag behind that on the master node due to Redis asynchronous replication. In this replication mechanism, the speed of I/O write operations on the master node may be higher than the speed of synchronization to the replica node. Also, network latency may exist between the master node and the replica node. Therefore, some data may be inconsistent between the master node and the replica node in a certain period.

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