nova-status: require placement >= 1.4

Since Ia1a0066dc30025c02553584a077365b28d8ff80e FilterScheduler will
no longer fall back to not using placement API. We need to require
version 1.4 to prevent NoValidHost errors.

Closes-Bug: #1669433

Change-Id: I6666cb2f558ed1f4e83f21e0317a206b07c25134

doc/source/man/nova-status.rst

@@ -95,6 +95,11 @@ Upgrade
     Placement service. More information on the Placement service can be found
     at: `<http://docs.openstack.org/developer/nova/placement.html>`_
 
+  **16.0.0 (Pike)**
+
+  * Checks for the Placement API are modified to require version 1.4, that
+    is needed in Pike and further for nova-scheduler to work correctly.
+
 
 SEE ALSO
 ========

nova/cmd/status.py

@@ -201,10 +201,9 @@ class UpgradeCommands(object):
         try:
             versions = self._placement_get("/")
             max_version = float(versions["versions"][0]["max_version"])
-            # The required version is a bit tricky but we know that we at least
-            # need 1.0 for Newton computes. This minimum might change in the
-            # future.
-            needs_version = 1.0
+            # NOTE(rpodolyaka): 1.4 is needed in Pike and further as
+            # FilterScheduler will no longer fall back to not using placement
+            needs_version = 1.4
             if max_version < needs_version:
                 msg = (_('Placement API version %(needed)s needed, '
                          'you have %(current)s.') %

nova/tests/unit/cmd/test_status.py

@@ -210,7 +210,7 @@ class TestPlacementCheck(test.NoDBTestCase):
             "versions": [
                 {
                     "min_version": "1.0",
-                    "max_version": "1.0",
+                    "max_version": "1.4",
                     "id": "v1.0"
                 }
             ]
@@ -231,7 +231,7 @@ class TestPlacementCheck(test.NoDBTestCase):
         }
         res = self.cmd._check_placement()
         self.assertEqual(status.UpgradeCheckCode.FAILURE, res.code)
-        self.assertIn('Placement API version 1.0 needed, you have 0.9',
+        self.assertIn('Placement API version 1.4 needed, you have 0.9',
                       res.details)
 
 

releasenotes/notes/no-placement-fallback-5db2d0645f51aca8.yaml

@@ -3,4 +3,6 @@ upgrade:
   - In Ocata, the nova-scheduler would fall back to not calling the
     placement service during instance boot if old computes were
     running. That compatibility mode is no longer present in Pike, and
-    as such, the scheduler fully depends on the placement service.
+    as such, the scheduler fully depends on the placement service.
+    This effectively means that in Pike Nova requires Placement API
+    version 1.4 (Ocata).