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由 antirez 提交于
This special command is used by the slave to inform the master the amount of replication stream it currently consumed. it does not return anything so that we not need to consume additional bandwidth needed by the master to reply something. The master can do a number of things knowing the amount of stream processed, such as understanding the "lag" in bytes of the slave, verify if a given command was already processed by the slave, and so forth.
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