1. A method for processing cache data, comprising: querying, by a cache client, at least a subset of a plurality of cache service nodes of a cache cluster; selecting a master cache service node from the plurality of cache service nodes based at least in part on queried values corresponding to the master cache service node; sending, by the cache client, a cache processing request to the master cache service node, wherein the cache processing request includes an operation; receiving, by the cache client, a response from the master cache service node, wherein in the event that the response indicates that the master cache service node has failed to perform the operation associated with the cache processing request, incrementing a failure count associated with the master cache service node; determining whether the master cache service node has failed, wherein determining includes comparing the failure count associated with the master cache service node with a threshold and in the event that the failure count exceeds the threshold, determining that the master cache service node has failed; and in the event that the master cache service node has failed: selecting, by the cache client, a backup cache service node from the plurality of cache service nodes to perform the cache processing request; sending, by the cache client, the cache processing request to the backup cache service node, wherein a task execution thread pool prevents one or more cache service nodes from the plurality of cache service nodes other than the backup cache service node from performing the operation; receiving a successful operation result corresponding to the cache processing request from the backup cache service node; and in response to the successful operation result, storing, by the cache client, the operation and the successful operation result in a cluster operation task queue, wherein the operation and the operation result are to be copied from the cluster operation task queue to the master cache service node in the event that the master cache service node recovers from failure.