python network_error ai_generated true

aiohttp.client_exceptions.ClientConnectionError: Connection pool is full

ID: python/aiohttp-client-connection-pool

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2025-01-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.7 active — — —
3.8 active — — —
3.9 active — — —

Root Cause

Too many concurrent requests exhausting the connection pool limit of aiohttp.

generic

中文

并发请求过多，耗尽了aiohttp的连接池限制。

Workarounds

  1. 95% success 
    sem = asyncio.Semaphore(10); async with sem: await session.get(url)
  2. 90% success 
    conn = aiohttp.TCPConnector(limit=100); async with aiohttp.ClientSession(connector=conn) as session:

Dead Ends

Common approaches that don't work:

  1. 60% fail

    May still be insufficient and can lead to memory issues.

  2. 70% fail

    Creates many sessions, causing resource leaks and performance degradation.