qa/tasks/cephfs: cast mds_recall_warning_decay_rate to float

this change should address the failure of
```
2020-04-05T15:14:23.088 INFO:tasks.cephfs_test_runner:Traceback (most recent call last):
2020-04-05T15:14:23.088 INFO:tasks.cephfs_test_runner:  File "/home/teuthworker/src/github.com_tchaikov_ceph_wip-qa-py3/qa/tasks/cephfs/test_client_limits.py", line 110, in test_client_pin_mincaps
2020-04-05T15:14:23.089 INFO:tasks.cephfs_test_runner:    self._test_client_pin(True, 200)
2020-04-05T15:14:23.089 INFO:tasks.cephfs_test_runner:  File "/home/teuthworker/src/github.com_tchaikov_ceph_wip-qa-py3/qa/tasks/cephfs/test_client_limits.py", line 71, in _test_client_pin
2020-04-05T15:14:23.090 INFO:tasks.cephfs_test_runner:    self.wait_for_health("MDS_CLIENT_RECALL", mds_recall_warning_decay_rate*2)
2020-04-05T15:14:23.091 INFO:tasks.cephfs_test_runner:  File "/home/teuthworker/src/github.com_tchaikov_ceph_wip-qa-py3/qa/tasks/ceph_test_case.py", line 152, in wait_for_health
2020-04-05T15:14:23.091 INFO:tasks.cephfs_test_runner:    self.wait_until_true(seen_health_warning, timeout)
2020-04-05T15:14:23.092 INFO:tasks.cephfs_test_runner:  File "/home/teuthworker/src/github.com_tchaikov_ceph_wip-qa-py3/qa/tasks/ceph_test_case.py", line 193, in wait_until_true
2020-04-05T15:14:23.093 INFO:tasks.cephfs_test_runner:    if elapsed >= timeout:
2020-04-05T15:14:23.093 INFO:tasks.cephfs_test_runner:TypeError: unorderable types: int() >= str()
```

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 162be9210613a4b4a921fa0ff285c869548d7d49)

Conflicts:
	qa/tasks/cephfs/test_client_limits.py: trivial resolution

diff --git a/qa/tasks/cephfs/test_client_limits.py b/qa/tasks/cephfs/test_client_limits.py
index bf4a469ed1e51812719527702bb3e6f93cca9ded..01b5db6554f808915353b0a80a2e49f4f0750f8c 100644 (file)
--- a/qa/tasks/cephfs/test_client_limits.py
+++ b/qa/tasks/cephfs/test_client_limits.py
@@ -48,7 +48,7 @@ class TestClientLimits(CephFSTestCase):
         self.fs.wait_for_daemons()
 
         mds_min_caps_per_client = int(self.fs.get_config("mds_min_caps_per_client"))
-        mds_recall_warning_decay_rate = self.fs.get_config("mds_recall_warning_decay_rate")
+        mds_recall_warning_decay_rate = float(self.fs.get_config("mds_recall_warning_decay_rate"))
         self.assertTrue(open_files >= mds_min_caps_per_client)
 
         mount_a_client_id = self.mount_a.get_global_id()