How does the system react if the main node (Master) stops working, and what happens to the slave nodes?

If the primary node (Master) in a distributed system stops working, the system's response depends on its architecture and fault tolerance mechanisms.

In the classic Master-Slave model:

• Slave nodes usually continue to operate, but without the master, they cannot accept new commands or synchronize.
• A mechanism to elect a new master (failover) is often required for the system to continue functioning.

If such a mechanism is not implemented:

• Slaves may enter a waiting mode or stop.
• Data may cease to update.

In systems with automatic failover (e.g., using leader election algorithms like Raft or Zookeeper):

• One of the Slaves becomes the new Master.
• The system restores operability without operator intervention.

Thus, when the Master fails, Slaves either wait for recovery or an automatic leadership transition occurs to ensure continuous operation.