in same cpu and memory resource for flink task, if there is network access cost in processing messages, what the difference between use asyncio and allocate multi slot?

for example, only one taskmanager, total resource is 1 cpu and 4 G memeory. one is allocate 10 slot in taskmanager another is use async io in flink, and make thread-pool size is 10

in same cpu and memory resource for flink task, if there is network access cost in processing messages, what the difference between use asyncio and allocate multi slot?

for example, only one taskmanager, total resource is 1 cpu and 4 G memeory. one is allocate 10 slot in taskmanager another is use async io in flink, and make thread-pool size is 10

• apache-flink

1 Answer 1

Async I/O in Flink handles non-blocking external calls (e.g., databases, APIs) using AsyncFunction, improving throughput by avoiding I/O bottlenecks.

Multi-slot execution manages task parallelism by allowing multiple tasks to share a TaskManager’s slots, optimizing resource usage.

Key Difference: Async I/O improves external call efficiency, while multi-slot execution optimizes resource allocation in Flink’s cluster.