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由 antirez 提交于
A slave node set this flag for itself when, after receiving authorization from the majority of nodes, it turns itself into a master. At the same time now this flag is tested by nodes receiving a PING message before reconfiguring after a failover event. This makes the system more robust: even if currently there is no way to manually turn a slave into a master it is possible that we'll have such a feature in the future, or that simply because of misconfiguration a node joins the cluster as master while others believe it's a slave. This alone is now no longer enough to trigger reconfiguration as other nodes will check for the PROMOTED flag. The PROMOTED flag is cleared every time the node is turned back into a replica of some other node.
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