A method, comprising: receiving at a receiving system (31, 32, 33) at least a portion of data that is needed to provide a target service from a processing system (41, 42, 43) wherein the data has been sent by a processing system according to a scheduling strategy of the processing system, wherein the target service relies on data associated with the target service being completely received at the receiving system before the target service can be provided at the receiving system, wherein the processing system is capable of providing data; sending, from the receiving system, a query request to the processing system, wherein the query request comprises labelling information that uniquely identifies the data that is needed to provide the target service, wherein the query request is configured to query the processing system for whether the processing system locally stores any data associated with the labelling information; receiving, at the receiving system, a query result corresponding to the query result from the processing system, wherein the query result comprises data that indicates whether data associated with the labelling information exists locally at the processing system; and determining whether the data needed to provide the target service has already been completely received, based at least in part on determining whether the query result indicates that the data associated with the labelling information exists locally at the processing system; wherein in the event that the query result indicates that the data associated with the labelling information does exist locally at the processing system, further comprising: determining that the data needed to provide the target service is not completely received from the processing system; and sending a data acquisition request to the processing system to request priority for sending the data associated with the labelling information. receiving at a receiving system (31, 32, 33) at least a portion of data that is needed to provide a target service from a processing system (41, 42, 43) wherein the data has been sent by a processing system according to a scheduling strategy of the processing system, wherein the target service relies on data associated with the target service being completely received at the receiving system before the target service can be provided at the receiving system, wherein the processing system is capable of providing data; sending, from the receiving system, a query request to the processing system, wherein the query request comprises labelling information that uniquely identifies the data that is needed to provide the target service, wherein the query request is configured to query the processing system for whether the processing system locally stores any data associated with the labelling information; receiving, at the receiving system, a query result corresponding to the query result from the processing system, wherein the query result comprises data that indicates whether data associated with the labelling information exists locally at the processing system; and determining whether the data needed to provide the target service has already been completely received, based at least in part on determining whether the query result indicates that the data associated with the labelling information exists locally at the processing system; wherein in the event that the query result indicates that the data associated with the labelling information does exist locally at the processing system, further comprising: determining that the data needed to provide the target service is not completely received from the processing system; and sending a data acquisition request to the processing system to request priority for sending the data determining that the data needed to provide the target service is not completely received from the processing system; and sending a data acquisition request to the processing system to request priority for sending the data associated with the labelling information.