Abstract: Provide are a session synchronization method, a session synchronization apparatus, a session synchronization system, a first node, a second node, and a medium. The session synchronization method includes sending a first negotiation message to at least one node in a cluster through a first central processing unit (CPU) core and determining a second node according to at least one received second negotiation message; sending a third negotiation message to the second node through the first CPU core; in the case where a fourth negotiation message sent from the second node is received through the first CPU core, receiving the user datagram protocol (UDP) message sent from the second node through a second CPU core; and synchronizing the session of the second node according to the UDP message through the second CPU core.