Service request filtering method, service request filtering device and service request filtering system

Embodiments of the invention provide a service request filtering method, a service request filtering device and a service request filtering system, and relate to the technical field of communication. Duplicate service requests can be filtered for nodes in an NFS (Network File System) in a scene with IP drift. The method comprises the following steps: a target node acquires a to-be-executed service request sent by a client; the target node queries whether the identifier of the to-be-executed service request is in a distributed cache, wherein the distributed cache records the identifier of the service request received by each of N nodes, the N nodes include the target node, and N>1; and if the identifier of the to-be-executed service request is in the distributed cache, the target node discards the to-be-executed service request. 本发明的实施例提供种业务请求的过滤方法、装置及系统，涉及通信技术领域，可在发生IP漂移的场景下，为NFS内的各节点过滤重复的业务请求。该包括：目标节点获取客户端发送的待执行业务请求；该目标节点在分布式缓存中查找是否存在该待执行业务请求的标识，该分布式缓存中记录有N个节点中每个节点已接收的业务请求的标识，该N个节点中包括该目标节点，N＞1；若存在该待执行业务请求的标识