PYTHON-4725 - Async client should use tasks for SDAM instead of threads
PYTHON-4860 - Async client should use asyncio.Lock and asyncio.Condition
PYTHON-4941 - Synchronous unified test runner being used in asynchronous tests
PYTHON-4843 - Async test suite should use a single event loop
PYTHON-4945 - Fix test cleanups for mongoses
Co-authored-by: Iris <58442094+sleepyStick@users.noreply.github.com>
MongoClient now requires 2 connections and 2 threads to each MongoDB 4.4+ server.
With one connection, the server streams (or pushes) updated heartbeat info.
With the other connection, the client periodically pings the server to
establish an accurate round-trip time (RTT). This change optimizes the
discovery of server state changes such as replica set elections.
Additional changes:
- Mark server Unknown before retrying isMaster check.
- Always reset the pool _after_ marking the server unknown.
- Configure fail point before creating the client in test SpecRunner.
- Unfreeze with replSetFreeze:0 to ensure a speedy elections in test suite.
