Disable grpc fork support on some test suites. (#38566)

* Disable grpc fork support in some test suite.

* Disable GRPC fork support.

* Add TODOs

Author: shunping

sdks/python/apache_beam/runners/portability/portable_runner_test.py

@@ -18,6 +18,7 @@
 
 import inspect
 import logging
+import os
 import socket
 import subprocess
 import sys
@@ -328,6 +329,22 @@ class PortableRunnerTestWithSubprocessesAndMultiWorkers(
     PortableRunnerTestWithSubprocesses):
   _use_subprocesses = True
 
+  # TODO(https://github.com/grpc/grpc/issues/37710): Remove once fixed.
+  @classmethod
+  def setUpClass(cls):
+    cls._old_fork_support = os.environ.get('GRPC_ENABLE_FORK_SUPPORT')
+    os.environ['GRPC_ENABLE_FORK_SUPPORT'] = 'false'
+    super().setUpClass()
+
+  # TODO(https://github.com/grpc/grpc/issues/37710): Remove once fixed.
+  @classmethod
+  def tearDownClass(cls):
+    if cls._old_fork_support is None:
+      os.environ.pop('GRPC_ENABLE_FORK_SUPPORT', None)
+    else:
+      os.environ['GRPC_ENABLE_FORK_SUPPORT'] = cls._old_fork_support
+    super().tearDownClass()
+
   def create_options(self):
     options = super() \
       .create_options()

sdks/python/apache_beam/utils/subprocess_server_test.py

@@ -37,6 +37,23 @@
 
 
 class JavaJarServerTest(unittest.TestCase):
+
+  # TODO(https://github.com/grpc/grpc/issues/37710): Remove once fixed.
+  @classmethod
+  def setUpClass(cls):
+    cls._old_fork_support = os.environ.get('GRPC_ENABLE_FORK_SUPPORT')
+    os.environ['GRPC_ENABLE_FORK_SUPPORT'] = 'false'
+    super().setUpClass()
+
+  # TODO(https://github.com/grpc/grpc/issues/37710): Remove once fixed.
+  @classmethod
+  def tearDownClass(cls):
+    if cls._old_fork_support is None:
+      os.environ.pop('GRPC_ENABLE_FORK_SUPPORT', None)
+    else:
+      os.environ['GRPC_ENABLE_FORK_SUPPORT'] = cls._old_fork_support
+    super().tearDownClass()
+
   def test_gradle_jar_release(self):
     self.assertEqual(
         'https://repo.maven.apache.org/maven2/org/apache/beam/'