Data prefetching method for distributed hash table dht storage system, node, and system

A storage node having a processor, comprising:

• an analysis module, configured to receive, by the processor, a read request that indicates a to-be-read first data block sent by a client, and determine a second data block and a second storage node in which the second data block resides according to the first data block and a preset to-be-prefetched data block threshold, wherein a segment of consecutive row data are divided into a plurality of data blocks and the plurality of data blocks are stored in different storage nodes;
• a notification module, configured to send, by the processor, a prefetching request to the storage node, wherein the prefetching request comprises identification information of the second data block, the identification information is used to identify the second data block.

A distributed storage system, comprising a first storage node and a second storage node, wherein

• the first storage node is configured to receive a read request that indicates a to-be-read first data block sent by a client, determine a second data block and a second storage node in which the second data block resides according to a read data block and a set second data block threshold, and send a prefetching request to the second storage node, wherein the first storage node and the second storage node are same or different storage nodes, the prefetching request comprises identification information of the second data block, and the identification information is used to uniquely identify the second data block, wherein a segment of consecutive row data are divided into a plurality of data blocks and the plurality of data blocks are stored in different storage nodes;
• and
• the second storage node is configured to read the second data block from a disk according to the prefetching request sent by the first storage node, and store the second data block in a local buffer, so that the client reads the second data block from the local buffer of the second storage node.