Cluster data processing method and device and server

The invention provides a cluster data processing method and device and a server, and is applied to the technical field of big data. On the basis of the method, when a server monitors that online capacity expansion of a target cluster needs to be started, an RDB file for the target cluster before capacity expansion is guided out, and meanwhile AOF synchronization log records are triggered and started; when it is determined that the online capacity expansion of the target cluster is finished, obtaining an AOF log and current cluster data of the target cluster; according to a preset proofreading rule, performing first proofreading processing by using the current cluster data of the target cluster and the RDB file, and determining difference data and a difference scene type of the difference data; and according to a preset proofreading rule, performing second proofreading processing on the difference data by utilizing the AOF log, the difference scene type of the difference data and the current cluster data of th