How is correct termination of a node's work ensured considering input data priority?

Proper shutdown of a node with input priority consideration is usually achieved through a priority processing mechanism and graceful shutdown.

Main steps:

1. Priority queue: Incoming data is placed in a priority queue. The node processes data with higher priority first.

2. Shutdown notification: Upon receiving a shutdown signal (e.g., SIGTERM), the node stops accepting new data but continues processing the already received, especially high-priority data.

3. Processing completion: The node waits for processing all high-priority data, then gradually processes the rest or saves their state for later recovery.

4. Resource cleanup: After processing all critical data, the node releases resources and exits properly.

Pseudo-code example:

while not shutdown_requested:
    data = get_next_data()
    process(data)

# On shutdown_requested
while has_high_priority_data():
    data = get_high_priority_data()
    process(data)

cleanup_resources()
exit()