Merge "Put instances in ERROR state when scheduler fails."

nova/scheduler/manager.py

@@ -23,6 +23,7 @@ Scheduler Service
 
 import functools
 
+from nova.compute import vm_states
 from nova import db
 from nova import flags
 from nova import log as logging
@@ -97,7 +98,19 @@ class SchedulerManager(manager.Manager):
             args = (context, topic, method) + args
 
         # Scheduler methods are responsible for casting.
-        return real_meth(*args, **kwargs)
+        try:
+            return real_meth(*args, **kwargs)
+        except Exception as e:
+            # If this affects a particular instance, move that
+            # instance to the ERROR state
+            if 'instance_id' in kwargs:
+                instance_id = kwargs['instance_id']
+                LOG.warning(_("Failed to %(driver_method)s: %(e)s.  "
+                              "Putting instance %(instance_id)s into "
+                              "ERROR state.") % locals())
+                db.instance_update(context, kwargs['instance_id'],
+                                   dict(vm_state=vm_states.ERROR))
+            raise
 
     # NOTE (masumotok) : This method should be moved to nova.api.ec2.admin.
     #                    Based on bexar design summit discussion,

nova/tests/scheduler/test_scheduler.py

@@ -132,6 +132,9 @@ class TestDriver(driver.Scheduler):
         method = 'named_method'
         driver.cast_to_host(context, topic, host, method, num=num)
 
+    def schedule_failing_method(self, context, instance_id):
+        raise exception.NoValidHost(reason="")
+
 
 class SchedulerTestCase(test.TestCase):
     """Test case for scheduler"""
@@ -244,6 +247,21 @@ class SchedulerTestCase(test.TestCase):
         db.instance_destroy(ctxt, i_ref1['id'])
         db.instance_destroy(ctxt, i_ref2['id'])
 
+    def test_exception_puts_instance_in_error_state(self):
+        """Test that an exception from the scheduler puts an instance
+        in the ERROR state."""
+
+        scheduler = manager.SchedulerManager()
+        ctxt = context.get_admin_context()
+        inst = _create_instance()
+        self.assertRaises(Exception, scheduler._schedule,
+                          'failing_method', ctxt, 'scheduler',
+                          instance_id=inst['uuid'])
+
+        # Refresh the instance
+        inst = db.instance_get(ctxt, inst['id'])
+        self.assertEqual(inst['vm_state'], vm_states.ERROR)
+
 
 class SimpleDriverTestCase(test.TestCase):
     """Test case for simple driver"""