Data Reading Method, Device and System

A first control node, comprising:

• a processor;
• and
• a memory coupled to the processor and storing instructions for execution by the processor, wherein the instructions instruct the processor to:
• receive a reading message from a second control node and then forwarded by a data switching device, wherein the reading message is used to instruct to read first data;
• read the first data from a first storage node when a data status identifier of the first data in the first storage node is a valid identifier;
• reset the data status identifier of the first data in the first storage node from the valid identifier to an undefined identifier;
• record a destination control node of the first data in the first storage node as the second control node;
• and
• send the read first data to the data switching device in order to be sent to the second control node,
• wherein the valid identifier indicates that the first data on the first storage node is available,
• wherein the undefined identifier indicates that the destination control node provides currently latest first data,
• wherein a node group comprises a storage node and a control node coupled to the storage node,
• wherein a maximum of one storage node in the node group stores the first data whose data status identifier is a valid identifier,
• wherein the data status identifier of the first data stored in the storage node in the node group is reset to the valid identifier when the storage node in the node group stores available first data,
• wherein the control node in the node group is configured to exercise read/write control on the storage node coupled to the control node,
• wherein the read/write control comprises setting a data status identifier for the first data,
• wherein either the first control node or the second control node is a control node in the node group, and
• wherein the first storage node is a storage node in the node group and coupled to the first control node.

A data processing system, wherein the data processing system is applied to a multiprocessor network, wherein the data processing system comprises:

• a storage node that is in the multiprocessor network and that stores first data;
• a control node coupled to the storage node;
• and
• one or more data switching devices, wherein each two control nodes are communicatively connected using the data switching device;
• a node group comprising a storage node in the data processing system and a control node in the data processing system, wherein a maximum of one storage node in the node group stores the first data whose data status identifier is a valid identifier, wherein the data status identifier of the first data stored in the storage node in the node group is reset to the valid identifier when the storage node in the node group stores available first data, wherein the control node is configured to exercise read/write control on the storage node coupled to the control node, wherein the read/write control comprises setting a data status identifier for the first data;
• a first control node;
• a second control node, wherein either the first control node or the second control node is a control node in the node group;
• a first storage node is a storage node that is in the node group and that is coupled to the first control node;
• and
• a second storage node is a storage node that is in the node group and that is coupled to the second control node,
• wherein the second control node is configured to send a reading message to the data switching device, wherein the reading message is used to instruct to read the first data,
• wherein the data switching device is configured to forward the reading message to other control nodes other than the second control node in the node group when receiving the reading message received from the second control node,
• wherein the first control node is configured to
• read the first data from the first storage node when receiving the reading message from the data switching device, when the data status identifier of the first data in the first storage node is the valid identifier;
• reset the data status identifier of the first data in the first storage node from the valid identifier to an undefined identifier;
• record a destination control node of the first data in the first storage node as the second control node;
• and
• send the first data to the data switching device,
• wherein the valid identifier indicates that the first data on the first storage node is available,
• wherein the undefined identifier indicates that the destination control node provides currently latest first data, and
• wherein the data switching device is further configured to forward the first data to the second control node.