feat(sdk) Add SemaphoreKey and MutexName fields to DSL

Signed-off-by: ddalvi <ddalvi@redhat.com>

Add tests to verify setting of SemaphoreKey and MutexName fields in DSL

Signed-off-by: ddalvi <ddalvi@redhat.com>

Implement getter setter functions with latest Pythonic properties

Signed-off-by: ddalvi <ddalvi@redhat.com>

Author: DharmitD

sdk/python/kfp/compiler/compiler_test.py

@@ -4336,6 +4336,67 @@ def my_pipeline():
                     pipeline_func=my_pipeline, package_path=output_yaml)
 
 
+class TestPipelineSemaphoreMutex(unittest.TestCase):
+
+    def test_pipeline_with_semaphore(self):
+        """Test that pipeline config correctly sets the semaphore key."""
+        config = PipelineConfig()
+        config.semaphore_key = 'semaphore'
+
+        @dsl.pipeline(pipeline_config=config)
+        def my_pipeline():
+            task = comp()
+
+        with tempfile.TemporaryDirectory() as tempdir:
+            output_yaml = os.path.join(tempdir, 'pipeline.yaml')
+            compiler.Compiler().compile(
+                pipeline_func=my_pipeline, package_path=output_yaml)
+
+            with open(output_yaml, 'r') as f:
+                pipeline_docs = list(yaml.safe_load_all(f))
+
+        platform_spec = None
+        for doc in pipeline_docs:
+            if 'platforms' in doc:
+                platform_spec = doc
+                break
+
+        self.assertIsNotNone(platform_spec,
+                             'No platforms section found in compiled output')
+        kubernetes_spec = platform_spec['platforms']['kubernetes'][
+            'pipelineConfig']
+        self.assertEqual(kubernetes_spec['semaphoreKey'], 'semaphore')
+
+    def test_pipeline_with_mutex(self):
+        """Test that pipeline config correctly sets the mutex name."""
+        config = PipelineConfig()
+        config.mutex_name = 'mutex'
+
+        @dsl.pipeline(pipeline_config=config)
+        def my_pipeline():
+            task = comp()
+
+        with tempfile.TemporaryDirectory() as tempdir:
+            output_yaml = os.path.join(tempdir, 'pipeline.yaml')
+            compiler.Compiler().compile(
+                pipeline_func=my_pipeline, package_path=output_yaml)
+
+            with open(output_yaml, 'r') as f:
+                pipeline_docs = list(yaml.safe_load_all(f))
+
+        platform_spec = None
+        for doc in pipeline_docs:
+            if 'platforms' in doc:
+                platform_spec = doc
+                break
+
+        self.assertIsNotNone(platform_spec,
+                             'No platforms section found in compiled output')
+        kubernetes_spec = platform_spec['platforms']['kubernetes'][
+            'pipelineConfig']
+        self.assertEqual(kubernetes_spec['mutexName'], 'mutex')
+
+
 class ExtractInputOutputDescription(unittest.TestCase):
 
     def test_no_descriptions(self):

sdk/python/kfp/compiler/pipeline_spec_builder.py

@@ -2242,14 +2242,20 @@ def _write_kubernetes_manifest_to_file(
 
 def _merge_pipeline_config(pipelineConfig: pipeline_config.PipelineConfig,
                            platformSpec: pipeline_spec_pb2.PlatformSpec):
+    config_dict = {}
+
     workspace = pipelineConfig.workspace
-    if workspace is None:
-        return platformSpec
+    if workspace is not None:
+        config_dict['workspace'] = workspace.get_workspace()
 
-    json_format.ParseDict(
-        {'pipelineConfig': {
-            'workspace': workspace.get_workspace(),
-        }}, platformSpec.platforms['kubernetes'])
+    if pipelineConfig.semaphore_key is not None:
+        config_dict['semaphoreKey'] = pipelineConfig.semaphore_key
+    if pipelineConfig.mutex_name is not None:
+        config_dict['mutexName'] = pipelineConfig.mutex_name
+
+    if config_dict:
+        json_format.ParseDict({'pipelineConfig': config_dict},
+                              platformSpec.platforms['kubernetes'])
 
     return platformSpec
 

sdk/python/kfp/dsl/pipeline_config.py

@@ -96,5 +96,57 @@ def set_kubernetes_config(self,
 class PipelineConfig:
     """PipelineConfig contains pipeline-level config options."""
 
-    def __init__(self, workspace: Optional[WorkspaceConfig] = None):
+    def __init__(self,
+                 workspace: Optional[WorkspaceConfig] = None,
+                 semaphore_key: Optional[str] = None,
+                 mutex_name: Optional[str] = None):
         self.workspace = workspace
+        self._semaphore_key = semaphore_key
+        self._mutex_name = mutex_name
+
+    @property
+    def semaphore_key(self) -> Optional[str]:
+        """Get the semaphore key for controlling pipeline concurrency.
+
+        Returns:
+            Optional[str]: The semaphore key, or None if not set.
+        """
+        return self._semaphore_key
+
+    @semaphore_key.setter
+    def semaphore_key(self, value: str):
+        """Set the semaphore key to control pipeline concurrency.
+
+        Pipelines with the same semaphore key will be limited to a configured maximum
+        number of concurrent executions. This allows you to control resource usage by
+        ensuring that only a specific number of pipelines can run simultaneously.
+
+        Note: A pipeline can use both semaphores and mutexes together. The pipeline
+        will wait until all required locks are available before starting.
+
+        Args:
+            value (str): The semaphore key name for controlling concurrent executions.
+        """
+        self._semaphore_key = (value and value.strip()) or None
+
+    @property
+    def mutex_name(self) -> Optional[str]:
+        """Get the mutex name for exclusive pipeline execution.
+
+        Returns:
+            Optional[str]: The mutex name, or None if not set.
+        """
+        return self._mutex_name
+
+    @mutex_name.setter
+    def mutex_name(self, value: str):
+        """Set the name of the mutex to ensure mutual exclusion.
+
+        Pipelines with the same mutex name will only run one at a time. This ensures
+        exclusive access to shared resources and prevents conflicts when multiple
+        pipelines would otherwise compete for the same resources.
+
+        Args:
+            value (str): Name of the mutex for exclusive pipeline execution.
+        """
+        self._mutex_name = (value and value.strip()) or None