Start integrating new GCS APIs (#1379)

* Start integrating new GCS calls

* fixes

* tests

* cleanup

* cleanup and valgrind fix

* update tests

* fix valgrind

* fix more valgrind

* fixes

* add separate tests for GCS

* fix linting

* update tests

* cleanup

* fix python linting

* more fixes

* fix linting

* add plasma manager callback

* add some documentation

* fix linting

* fix linting

* fixes

* update

* fix linting

* fix

* add spillback count

* fixes

* linting

* fixes

* fix linting

* fix

* fix

* fix

python/ray/global_scheduler/test/test.py

@@ -188,6 +188,9 @@ class TestGlobalScheduler(unittest.TestCase):
         db_client_id = self.get_plasma_manager_id()
         assert(db_client_id is not None)
 
+    @unittest.skipIf(
+        os.environ.get('RAY_USE_NEW_GCS', False),
+        "New GCS API doesn't have a Python API yet.")
     def test_integration_single_task(self):
         # There should be three db clients, the global scheduler, the local
         # scheduler, and the plasma manager.
@@ -301,9 +304,15 @@ class TestGlobalScheduler(unittest.TestCase):
 
         self.assertEqual(num_tasks_done, num_tasks)
 
+    @unittest.skipIf(
+        os.environ.get('RAY_USE_NEW_GCS', False),
+        "New GCS API doesn't have a Python API yet.")
     def test_integration_many_tasks_handler_sync(self):
         self.integration_many_tasks_helper(timesync=True)
 
+    @unittest.skipIf(
+        os.environ.get('RAY_USE_NEW_GCS', False),
+        "New GCS API doesn't have a Python API yet.")
     def test_integration_many_tasks(self):
         # More realistic case: should handle out of order object and task
         # notifications.