python runtime_error ai_generated true

asyncio.queues.QueueFull

ID: python/asyncio-queue-full

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-05-21First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

put_nowait() was called on an asyncio.Queue that reached its maxsize; the producer is faster than the consumer.

generic

中文

在达到 maxsize 的 asyncio.Queue 上调用了 put_nowait()；生产者比消费者快。

Workarounds

  1. 95% success 
    Use await queue.put(item) to apply backpressure:

await queue.put(item)
  2. 88% success 
    Add more consumer tasks to drain faster:

consumers = [asyncio.create_task(worker(queue)) for _ in range(10)]
  3. 82% success 
    For bounded producers, drop-oldest semantics:

if queue.full():
    queue.get_nowait()
queue.put_nowait(item)

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Postpones the error and increases memory pressure; eventually fills again.

  2. 85% fail

    Silently drops items, corrupting downstream processing.

  3. 75% fail

    Loses async backpressure and blocking semantics; consumers may busy-wait.