Limit dnspython to < 2.3.0 until eventlet incompatibitliy is solved (#…

…28962)

The dnspython has been released 2 hours ago and apparently eventlet
that cassandra-driver uses is not compatible with the new version.

Until the problem is fixed, we should limit dnspython to <2.3.0.

Related: eventlet/eventlet#781

airflow/providers/apache/cassandra/provider.yaml

@@ -36,6 +36,11 @@ versions:
 dependencies:
   - apache-airflow>=2.3.0
   - cassandra-driver>=3.13.0
+  # dnspython 2.3.0 is not compatible with eventlet that cassandra-driver uses under-the-hood
+  # This can be removed when the issue is resolved (reported in two places):
+  # * https://github.com/eventlet/eventlet/issues/781
+  # * https://datastax-oss.atlassian.net/browse/PYTHON-1320
+  - dnspython<2.3.0
 
 integrations:
   - integration-name: Apache Cassandra

generated/provider_dependencies.json

@@ -53,7 +53,8 @@
   "apache.cassandra": {
     "deps": [
       "apache-airflow>=2.3.0",
-      "cassandra-driver>=3.13.0"
+      "cassandra-driver>=3.13.0",
+      "dnspython<2.3.0"
     ],
     "cross-providers-deps": []
   },

setup.py

@@ -216,6 +216,11 @@ def write_version(filename: str = str(AIRFLOW_SOURCES_ROOT / "airflow" / "git_ve
 # If you change this mark you should also change ./scripts/ci/check_order_setup.py
 # Start dependencies group
 async_packages = [
+    # dnspython 2.3.0 is not compatible with eventlet.
+    # This can be removed when the issue is resolved (reported in two places):
+    # * https://github.com/eventlet/eventlet/issues/781
+    # * https://datastax-oss.atlassian.net/browse/PYTHON-1320
+    "dnspython<2.3.0",
     "eventlet>=0.9.7",
     "gevent>=0.13",
     "greenlet>=0.4.9",