mgr/cephadm: do not complain when we don't have enough hosts

This gets rid of INFO level log events like

2020-03-09T13:37:20.980993-0500 mgr.x [WRN] Failed to apply mds.foo spec ServiceSpec({'placement': PlacementSpec(count:2), 'service_type': 'mds', 'service_id': 'foo'}): List of host candidates is empty

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/pybind/mgr/cephadm/module.py b/src/pybind/mgr/cephadm/module.py
index e5e203c07e73b221c86489635f6c544d609e9450..e31a4f5f774e296969f8295b400ede8506d0ba0e 100644 (file)
--- a/src/pybind/mgr/cephadm/module.py
+++ b/src/pybind/mgr/cephadm/module.py
@@ -3037,7 +3037,7 @@ class SimpleScheduler(BaseScheduler):
     def place(self, host_pool, count=None):
         # type: (List, Optional[int]) -> List[HostPlacementSpec]
         if not host_pool:
-            raise Exception('List of host candidates is empty')
+            return []
         host_pool = [x for x in host_pool]
         # shuffle for pseudo random selection
         random.shuffle(host_pool)