Prefetch (QoS) huweka kikomo cha ni ujumbe ngapi usiokubaliwa (unacknowledged) consumer anaweza kushikilia kwa wakati mmoja — ikidhibiti usambazaji wa kazi na kuzuia consumer mmoja kuzidiwa wakati wengine wapo bila kazi. Ni muhimu kwa uchakataji wa ujumbe wa haki na wenye ufanisi.
Prefetch hufanya nini
PREFETCH (QoS - prefetch count) → limits the number of UNACKNOWLEDGED messages a consumer
can have at once:
→ without it → RabbitMQ may dispatch many messages to one consumer (it grabs a batch)
→ with prefetch=N → a consumer gets at most N unacked messages at a time (must ack to get more)
→ controls how messages are distributed and how much a consumer buffers
