Revert "Updates Python ExternalTransform to use the transform service…

… when needed (apache#27228)"

This reverts commit d545243.

sdks/python/apache_beam/options/pipeline_options.py

@@ -533,13 +533,6 @@ def _add_argparse_args(cls, parser):
             'Should be a json mapping of gradle build targets to pre-built '
             'artifacts (e.g. jar files) expansion endpoints (e.g. host:port).'))
 
-    parser.add_argument(
-        '--use_transform_service',
-        default=False,
-        action='store_true',
-        help='Use the Docker-composed-based transform service when expanding '
-        'cross-language transforms.')
-
 
 def additional_option_ptransform_fn():
   beam.transforms.ptransform.ptransform_fn_typehints_enabled = True

sdks/python/apache_beam/transforms/external.py

@@ -23,9 +23,7 @@
 import functools
 import glob
 import logging
-import subprocess
 import threading
-import uuid
 from collections import OrderedDict
 from collections import namedtuple
 from typing import Dict
@@ -34,7 +32,6 @@
 
 from apache_beam import pvalue
 from apache_beam.coders import RowCoder
-from apache_beam.options.pipeline_options import CrossLanguageOptions
 from apache_beam.portability import common_urns
 from apache_beam.portability.api import beam_artifact_api_pb2_grpc
 from apache_beam.portability.api import beam_expansion_api_pb2
@@ -54,7 +51,6 @@
 from apache_beam.typehints.typehints import Union
 from apache_beam.typehints.typehints import UnionConstraint
 from apache_beam.utils import subprocess_server
-from apache_beam.utils import transform_service_launcher
 
 DEFAULT_EXPANSION_SERVICE = 'localhost:8097'
 
@@ -672,10 +668,7 @@ def expand(self, pvalueish):
         transform=transform_proto,
         output_coder_requests=output_coders)
 
-    expansion_service = _maybe_use_transform_service(
-        self._expansion_service, pipeline.options)
-
-    with ExternalTransform.service(expansion_service) as service:
+    with ExternalTransform.service(self._expansion_service) as service:
       response = service.Expand(request)
       if response.error:
         raise RuntimeError(response.error)
@@ -980,71 +973,6 @@ def __init__(
         path_to_jar, extra_args, classpath=classpath, append_args=append_args)
 
 
-def _maybe_use_transform_service(provided_service=None, options=None):
-  # For anything other than 'JavaJarExpansionService' we just use the
-  # provided service. For example, string address of an already available
-  # service.
-  if not isinstance(provided_service, JavaJarExpansionService):
-    return provided_service
-
-  def is_java_available():
-    cmd = ['java', '--version']
-
-    try:
-      subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-    except:  # pylint: disable=bare-except
-      return False
-
-    return True
-
-  def is_docker_available():
-    cmd = ['docker', '--version']
-
-    try:
-      subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-    except:  # pylint: disable=bare-except
-      return False
-
-    return True
-
-  # We try java and docker based expansion services in that order.
-
-  java_available = is_java_available()
-  docker_available = is_docker_available()
-
-  use_transform_service = options.view_as(
-      CrossLanguageOptions).use_transform_service
-
-  if (java_available and provided_service and not use_transform_service):
-    return provided_service
-  elif docker_available:
-    if use_transform_service:
-      error_append = 'it was explicitly requested'
-    elif not java_available:
-      error_append = 'the Java executable is not available in the system'
-    else:
-      error_append = 'a Java expansion service was not provided.'
-
-    project_name = str(uuid.uuid4())
-    port = subprocess_server.pick_port(None)[0]
-
-    logging.info(
-        'Trying to expand the external transform using the Docker Compose '
-        'based transform service since %s. Transform service will be under '
-        'Docker Compose project name %s and will be made available at port %r.'
-        % (error_append, project_name, str(port)))
-
-    from apache_beam import version as beam_version
-    beam_version = beam_version.__version__
-
-    return transform_service_launcher.TransformServiceLauncher(
-        project_name, port, beam_version)
-  else:
-    raise ValueError(
-        'Cannot start an expansion service since neither Java nor '
-        'Docker executables are available in the system.')
-
-
 def memoize(func):
   cache = {}