1. A method for processing cache data, comprising: sending a cache processing request to a master cache service node in a cache cluster that includes a plurality of cache service nodes, the cache cluster being configurable in an active cluster configuration mode wherein the plurality of cache service nodes are all in working state and a master cache service node is selected among the plurality of cache service nodes, or in a standby cluster configuration mode, wherein the master cache service node is the only node among the plurality of cache service nodes that is in working state; waiting for a response from the master cache service node; determining whether the master cache service node has failed; and in the event that the master cache service node has failed, selecting a backup cache service node.