Remove legacy Ray code. (#3121)

* Remove legacy Ray code.

* Fix cmake and simplify monitor.

* Fix linting

* Updates

* Fix

* Implement some methods.

* Remove more plasma manager references.

* Fix

* Linting

* Fix

* Fix

* Make sure class IDs are strings.

* Some path fixes

* Fix

* Path fixes and update arrow

* Fixes.

* linting

* Fixes

* Java fixes

* Some java fixes

* TaskLanguage -> Language

* Minor

* Fix python test and remove unused method signature.

* Fix java tests

* Fix jenkins tests

* Remove commented out code.

test/failure_test.py

@@ -394,9 +394,7 @@ def ray_start_object_store_memory():
     ray.shutdown()
 
 
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") != "0",
-    reason="This test does not work with xray yet.")
+@pytest.mark.skip("This test does not work yet.")
 def test_put_error1(ray_start_object_store_memory):
     num_objects = 3
     object_size = 4 * 10**5
@@ -438,9 +436,7 @@ def test_put_error1(ray_start_object_store_memory):
     wait_for_errors(ray_constants.PUT_RECONSTRUCTION_PUSH_ERROR, 1)
 
 
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") != "0",
-    reason="This test does not work with xray yet.")
+@pytest.mark.skip("This test does not work yet.")
 def test_put_error2(ray_start_object_store_memory):
     # This is the same as the previous test, but it calls ray.put directly.
     num_objects = 3
@@ -494,9 +490,6 @@ def test_version_mismatch(shutdown_only):
     ray.__version__ = ray_version
 
 
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") == "0",
-    reason="This test only works with xray.")
 def test_warning_monitor_died(shutdown_only):
     ray.init(num_cpus=0)
 
@@ -538,9 +531,6 @@ def test_export_large_objects(ray_start_regular):
     wait_for_errors(ray_constants.PICKLING_LARGE_OBJECT_PUSH_ERROR, 2)
 
 
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") == "0",
-    reason="This test only works with xray.")
 def test_warning_for_infeasible_tasks(ray_start_regular):
     # Check that we get warning messages for infeasible tasks.
 
@@ -561,9 +551,6 @@ def test_warning_for_infeasible_tasks(ray_start_regular):
     wait_for_errors(ray_constants.INFEASIBLE_TASK_ERROR, 2)
 
 
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") != "1",
-    reason="This test only works with xray.")
 def test_warning_for_infeasible_zero_cpu_actor(shutdown_only):
     # Check that we cannot place an actor on a 0 CPU machine and that we get an
     # infeasibility warning (even though the actor creation task itself
@@ -591,9 +578,6 @@ def ray_start_two_nodes():
 
 # Note that this test will take at least 10 seconds because it must wait for
 # the monitor to detect enough missed heartbeats.
-@pytest.mark.skipif(
-    os.environ.get("RAY_USE_XRAY") == "0",
-    reason="This test only works with xray.")
 def test_warning_for_dead_node(ray_start_two_nodes):
     # Wait for the raylet to appear in the client table.
     while len(ray.global_state.client_table()) < 2: