[Feature] Set ttlSecondsAfterFinished in argo workflow with PipelineConf (#1594)

* Add PipelineConf method to set ttlSecondsAfterFinished in argo workflow spec

* remove unnecessary compile test for ttl. add unit test for ttl instead.

sdk/python/kfp/compiler/compiler.py

@@ -545,6 +545,10 @@ class Compiler(object):
         'serviceAccountName': 'pipeline-runner'
       }
     }
+    # set ttl after workflow finishes
+    if pipeline.conf.ttl_seconds_after_finished >= 0:
+      workflow['spec']['ttlSecondsAfterFinished'] = pipeline.conf.ttl_seconds_after_finished
+
     if len(pipeline.conf.image_pull_secrets) > 0:
       image_pull_secrets = []
       for image_pull_secret in pipeline.conf.image_pull_secrets:

sdk/python/kfp/dsl/_pipeline.py

@@ -57,6 +57,7 @@ class PipelineConf():
   def __init__(self):
     self.image_pull_secrets = []
     self.timeout = 0
+    self.ttl_seconds_after_finished = -1
     self.artifact_location = None
     self.op_transformers = []
 
@@ -80,6 +81,15 @@ class PipelineConf():
     self.timeout = seconds
     return self
 
+  def set_ttl_seconds_after_finished(self, seconds: int):
+    """Configures the ttl after the pipeline has finished.
+
+    Args:
+      seconds: number of seconds for the workflow to be garbage collected after it is finished.
+    """
+    self.ttl_seconds_after_finished = seconds
+    return self   
+
   def set_artifact_location(self, artifact_location):
     """Configures the pipeline level artifact location.
 

sdk/python/tests/compiler/compiler_tests.py

@@ -523,6 +523,22 @@ implementation:
     template = workflow_dict['spec']['templates'][0]
     self.assertEqual(template['metadata']['annotations']['pipelines.kubeflow.org/task_display_name'], 'Custom name')
 
+  def test_set_ttl_seconds_after_finished(self):
+    """Test a pipeline with ttl after finished."""
+    def some_op():
+        return dsl.ContainerOp(
+            name='sleep',
+            image='busybox',
+            command=['sleep 1'],
+        )
+
+    @dsl.pipeline()
+    def some_pipeline():
+      some_op()
+      dsl.get_pipeline_conf().set_ttl_seconds_after_finished(86400)
+
+    workflow_dict = kfp.compiler.Compiler()._compile(some_pipeline)
+    self.assertEqual(workflow_dict['spec']['ttlSecondsAfterFinished'], 86400)
 
   def test_op_transformers(self):
     def some_op():