Fix broken pipe callback (#4513)

python/ray/node.py

@@ -573,8 +573,10 @@ class Node(object):
             check_alive (bool): Raise an exception if the process was already
                 dead.
         """
-        self._kill_process_type(
-            ray_constants.PROCESS_TYPE_REPORTER, check_alive=check_alive)
+        # reporter is started only in PY3.
+        if PY3:
+            self._kill_process_type(
+                ray_constants.PROCESS_TYPE_REPORTER, check_alive=check_alive)
 
     def kill_dashboard(self, check_alive=True):
         """Kill the dashboard.

python/ray/tests/test_component_failures.py

@@ -329,7 +329,7 @@ def test_raylet_failed(ray_start_cluster):
 @pytest.mark.parametrize(
     "ray_start_cluster", [{
         "num_cpus": 8,
-        "num_nodes": 4
+        "num_nodes": 2
     }], indirect=True)
 def test_plasma_store_failed(ray_start_cluster):
     cluster = ray_start_cluster

python/ray/tests/test_multi_node_2.py

@@ -84,6 +84,7 @@ def test_worker_plasma_store_failure(ray_start_cluster_head):
     cluster.wait_for_nodes()
     # Log monitor doesn't die for some reason
     worker.kill_log_monitor()
+    worker.kill_reporter()
     worker.kill_plasma_store()
     worker.all_processes[ray_constants.PROCESS_TYPE_RAYLET][0].process.wait()
     assert not worker.any_processes_alive(), worker.live_processes()