This application provides a data processing method and apparatus. One example method includes: After sending a first request message corresponding to a first write request message, and before receiving a first response message, if a first management unit receives another write request with a same Cacheline address as the first write request message is received, a plurality of pieces of data with the same Cacheline address are written into cache space corresponding to the first management unit, and then the data is written into storage space corresponding to a second management unit.