diff --git a/examples/java/src/main/java/org/apache/beam/examples/cookbook/TriggerExample.java b/examples/java/src/main/java/org/apache/beam/examples/cookbook/TriggerExample.java
index cd3c6dd84157..64a4f4d73d32 100644
--- a/examples/java/src/main/java/org/apache/beam/examples/cookbook/TriggerExample.java
+++ b/examples/java/src/main/java/org/apache/beam/examples/cookbook/TriggerExample.java
@@ -486,7 +486,10 @@ static void runTriggerExample(TrafficFlowOptions options) throws IOException {
           .get(i)
           .apply(
               "BigQuery Write Rows" + i,
-              BigQueryIO.writeTableRows().to(tableRef).withSchema(getSchema()));
+              BigQueryIO.writeTableRows()
+                  .to(tableRef)
+                  .withSchema(getSchema())
+                  .withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND));
     }
 
     PipelineResult result = pipeline.run();
diff --git a/sdks/python/apache_beam/io/gcp/gcsfilesystem.py b/sdks/python/apache_beam/io/gcp/gcsfilesystem.py
index 3763e21abc9f..4cf4c560b680 100644
--- a/sdks/python/apache_beam/io/gcp/gcsfilesystem.py
+++ b/sdks/python/apache_beam/io/gcp/gcsfilesystem.py
@@ -34,7 +34,6 @@
 from apache_beam.io.filesystem import CompressionTypes
 from apache_beam.io.filesystem import FileMetadata
 from apache_beam.io.filesystem import FileSystem
-from apache_beam.io.gcp import gcsio
 
 __all__ = ['GCSFileSystem']
 
@@ -42,8 +41,23 @@
 class GCSFileSystem(FileSystem):
   """A GCS ``FileSystem`` implementation for accessing files on GCS.
   """
+  def _get_gcsio(self):
+    try:
+      from apache_beam.io.gcp import gcsio
+      return gcsio
+    except ImportError:
+      raise ImportError(
+          'GCSFileSystem requires apache-beam[gcp]. '
+          'Install it with: pip install apache-beam[gcp]')
+
+  _CHUNK_SIZE = None
+
+  @property
+  def CHUNK_SIZE(self):
+    if self._CHUNK_SIZE is None:
+      self._CHUNK_SIZE = self._get_gcsio().MAX_BATCH_OPERATION_SIZE
+    return self._CHUNK_SIZE  # Chuck size in batch operations
 
-  CHUNK_SIZE = gcsio.MAX_BATCH_OPERATION_SIZE  # Chuck size in batch operations
   GCS_PREFIX = 'gs://'
 
   def __init__(self, pipeline_options):
@@ -139,6 +153,7 @@ def _list(self, dir_or_prefix):
       raise BeamIOError("List operation failed", {dir_or_prefix: e})
 
   def _gcsIO(self):
+    gcsio = self._get_gcsio()
     return gcsio.GcsIO(pipeline_options=self._pipeline_options)
 
   def _path_open(
@@ -370,6 +385,7 @@ def delete(self, paths):
 
   def report_lineage(self, path, lineage):
     try:
+      gcsio = self._get_gcsio()
       components = gcsio.parse_gcs_path(path, object_optional=True)
     except ValueError:
       # report lineage is fail-safe
diff --git a/sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py b/sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py
index 08fdd6302887..66bb9bd48dd3 100644
--- a/sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py
+++ b/sdks/python/apache_beam/io/gcp/gcsfilesystem_test.py
@@ -28,6 +28,7 @@
 from apache_beam.io.filesystem import BeamIOError
 from apache_beam.io.filesystem import FileMetadata
 from apache_beam.options.pipeline_options import PipelineOptions
+from apache_beam.io.filesystems import FileSystems
 
 # Protect against environments where apitools library is not available.
 # pylint: disable=wrong-import-order, wrong-import-position
@@ -38,6 +39,12 @@
 # pylint: enable=wrong-import-order, wrong-import-position
 
 
+class GCSFileSystemLazyLoadTest(unittest.TestCase):
+  def test_get_filesystem_does_not_require_gcp_extra(self):
+    fs = FileSystems.get_filesystem('gs://test-bucket/path')
+    self.assertEqual(fs.scheme(), 'gs')
+
+
 @unittest.skipIf(gcsfilesystem is None, 'GCP dependencies are not installed')
 class GCSFileSystemTest(unittest.TestCase):
   def setUp(self):
@@ -77,11 +84,13 @@ def test_split(self):
     with self.assertRaises(ValueError):
       self.fs.split('/no/gcs/prefix')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_match_multiples(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_match_multiples(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     gcsio_mock.list_files.return_value = iter([
         ('gs://bucket/file1', (1, 99999.0)),
         ('gs://bucket/file2', (2, 88888.0))
@@ -95,12 +104,14 @@ def test_match_multiples(self, mock_gcsio):
     gcsio_mock.list_files.assert_called_once_with(
         'gs://bucket/', with_metadata=True)
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_match_multiples_limit(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_match_multiples_limit(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
     limit = 1
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     gcsio_mock.list_files.return_value = iter([
         ('gs://bucket/file1', (1, 99999.0))
     ])
@@ -111,11 +122,13 @@ def test_match_multiples_limit(self, mock_gcsio):
     gcsio_mock.list_files.assert_called_once_with(
         'gs://bucket/', with_metadata=True)
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_match_multiples_error(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_match_multiples_error(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     exception = IOError('Failed')
     gcsio_mock.list_files.side_effect = exception
 
@@ -127,11 +140,13 @@ def test_match_multiples_error(self, mock_gcsio):
     gcsio_mock.list_files.assert_called_once_with(
         'gs://bucket/', with_metadata=True)
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_match_multiple_patterns(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_match_multiple_patterns(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     gcsio_mock.list_files.side_effect = [
         iter([('gs://bucket/file1', (1, 99999.0))]),
         iter([('gs://bucket/file2', (2, 88888.0))]),
@@ -141,33 +156,39 @@ def test_match_multiple_patterns(self, mock_gcsio):
     result = self.fs.match(['gs://bucket/file1*', 'gs://bucket/file2*'])
     self.assertEqual([mr.metadata_list for mr in result], expected_results)
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_create(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_create(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     # Issue file copy
     _ = self.fs.create('gs://bucket/from1', 'application/octet-stream')
 
     gcsio_mock.open.assert_called_once_with(
         'gs://bucket/from1', 'wb', mime_type='application/octet-stream')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_open(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_open(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     # Issue file copy
     _ = self.fs.open('gs://bucket/from1', 'application/octet-stream')
 
     gcsio_mock.open.assert_called_once_with(
         'gs://bucket/from1', 'rb', mime_type='application/octet-stream')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_copy_file(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_copy_file(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = ['gs://bucket/from1']
     destinations = ['gs://bucket/to1']
 
@@ -177,11 +198,13 @@ def test_copy_file(self, mock_gcsio):
     gcsio_mock.copy.assert_called_once_with(
         'gs://bucket/from1', 'gs://bucket/to1')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_copy_file_error(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_copy_file_error(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = ['gs://bucket/from1']
     destinations = ['gs://bucket/to1']
 
@@ -201,11 +224,13 @@ def test_copy_file_error(self, mock_gcsio):
     gcsio_mock.copy.assert_called_once_with(
         'gs://bucket/from1', 'gs://bucket/to1')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_copy_tree(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_copy_tree(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = ['gs://bucket1/']
     destinations = ['gs://bucket2/']
 
@@ -215,11 +240,13 @@ def test_copy_tree(self, mock_gcsio):
     gcsio_mock.copytree.assert_called_once_with(
         'gs://bucket1/', 'gs://bucket2/')
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_rename(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_rename(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = [
         'gs://bucket/from1',
         'gs://bucket/from2',
@@ -255,11 +282,13 @@ def test_rename(self, mock_gcsio):
         'gs://bucket/from3',
     ])
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_rename_delete_error(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_rename_delete_error(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = [
         'gs://bucket/from1',
         'gs://bucket/from2',
@@ -296,11 +325,13 @@ def test_rename_delete_error(self, mock_gcsio):
         'gs://bucket/from3',
     ])
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_rename_copy_error(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_rename_copy_error(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     sources = [
         'gs://bucket/from1',
         'gs://bucket/from2',
@@ -335,11 +366,13 @@ def test_rename_copy_error(self, mock_gcsio):
         'gs://bucket/from3',
     ])
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_delete(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_delete(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
     gcsio_mock._status.return_value = {'size': 0, 'updated': 99999.0}
     files = [
         'gs://bucket/from1',
@@ -351,11 +384,13 @@ def test_delete(self, mock_gcsio):
     self.fs.delete(files)
     gcsio_mock.delete_batch.assert_called()
 
-  @mock.patch('apache_beam.io.gcp.gcsfilesystem.gcsio')
-  def test_delete_error(self, mock_gcsio):
+  @mock.patch('apache_beam.io.gcp.gcsfilesystem.GCSFileSystem._get_gcsio')
+  def test_delete_error(self, mock_get_gcsio):
     # Prepare mocks.
     gcsio_mock = mock.MagicMock()
-    gcsfilesystem.gcsio.GcsIO = lambda pipeline_options=None: gcsio_mock
+    mock_gcsio_module = mock.MagicMock()
+    mock_gcsio_module.GcsIO.return_value = gcsio_mock
+    mock_get_gcsio.return_value = mock_gcsio_module
 
     gcsio_mock._status.return_value = {'size': 0, 'updated': 99999.0}
     files = [