Disable grpc fork support on some test suites.

[shunping]

We are still seeing DEADLINE EXCEEDED errors related to GRPC fork in our github test workflows:

• JavaJarServerTest
• PortableRunnerTestWithSubprocessesAndMultiWorkers

The issue has been tracked under grpc/grpc#37710.

Example traceback:

_____________________ JavaJarServerTest.test_classpath_jar _____________________
[gw3] darwin -- Python 3.13.13 /Users/runner/work/beam/beam/sdks/python/target/.tox/py313-macos/bin/python

self = <apache_beam.utils.subprocess_server_test.JavaJarServerTest testMethod=test_classpath_jar>

      @unittest.skipUnless(shutil.which('javac'), 'missing java jdk')
      def test_classpath_jar(self):
...
>           subprocess.check_call(f'java -jar {composite_jar}'.split())

apache_beam/utils/subprocess_server_test.py:225: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['java', '-jar', 'beam_temp/composite-jars/b673a40efb1e743323f7a75a292271fa99a90ab0199fe71896bb17eacc17a88d.jar'],)
kwargs = {}, retcode = -6
cmd = ['java', '-jar', 'beam_temp/composite-jars/b673a40efb1e743323f7a75a292271fa99a90ab0199fe71896bb17eacc17a88d.jar']

    def check_call(*popenargs, **kwargs):
        """Run command with arguments.  Wait for command to complete.  If
        the exit code was zero then return, otherwise raise
        CalledProcessError.  The CalledProcessError object will have the
        return code in the returncode attribute.
    
        The arguments are the same as for the call function.  Example:
    
        check_call(["ls", "-l"])
        """
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessError(retcode, cmd)
E           subprocess.CalledProcessError: Command '['java', '-jar', 'beam_temp/composite-jars/b673a40efb1e743323f7a75a292271fa99a90ab0199fe71896bb17eacc17a88d.jar']' died with <Signals.SIGABRT: 6>.

/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/subprocess.py:419: CalledProcessError
----------------------------- Captured stderr call -----------------------------
I0520 04:04:48.181718   13998 fork_posix.cc:71] Other threads are currently calling into gRPC, skipping fork() handlers
I0520 04:04:48.189891  187465 ev_poll_posix.cc:593] FD from fork parent still in poll list: fd(23, generation: 1)
I0520 04:04:48.190076  187465 ev_poll_posix.cc:593] FD from fork parent still in poll list: fd(22, generation: 1)
I0520 04:04:48.190090  187465 ev_poll_posix.cc:593] FD from fork parent still in poll list: fd(35, generation: 1)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses stability issues in the CI pipeline by disabling GRPC fork support for specific test suites that were failing with SIGABRT errors. By explicitly setting the GRPC_ENABLE_FORK_SUPPORT environment variable to 'false' during these tests, we prevent gRPC from attempting fork operations that conflict with the current test environment, while ensuring the original environment state is restored after test completion.

Highlights

• GRPC Fork Support: Disabled GRPC fork support in specific test suites to resolve intermittent DEADLINE EXCEEDED errors.
• Test Stability: Implemented setUpClass and tearDownClass methods to toggle the GRPC_ENABLE_FORK_SUPPORT environment variable for JavaJarServerTest and PortableRunnerTestWithSubprocessesAndMultiWorkers.

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[gemini-code-assist]

Code Review

This pull request disables gRPC fork support in the PortableRunnerTestWithSubprocessesAndMultiWorkers and JavaJarServerTest classes by setting the GRPC_ENABLE_FORK_SUPPORT environment variable to 'false'. The reviewer identified a missing os import in subprocess_server_test.py that would lead to a NameError. Additionally, the feedback suggests using addClassCleanup for more robust environment variable restoration, which ensures cleanup occurs even if the setup phase fails.

[shunping]

r: @derrickaw

[github-actions]

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