Ceph » CephFS

This came up during [0] where a new flag is required to evict client/session and testing it threw this:

2023-07-29 10:00:12,603.603 INFO:__main__:
2023-07-29 10:00:12,603.603 INFO:__main__:======================================================================
2023-07-29 10:00:12,603.603 INFO:__main__:ERROR: test_client_evict (tasks.cephfs.test_misc.TestSessionClientEvict.test_client_evict)
2023-07-29 10:00:12,603.603 INFO:__main__:----------------------------------------------------------------------
2023-07-29 10:00:12,603.603 INFO:__main__:Traceback (most recent call last):
2023-07-29 10:00:12,603.603 INFO:__main__:  File "/home/neerajpratapsingh/ceph/qa/tasks/cephfs/test_misc.py", line 554, in test_client_evict
2023-07-29 10:00:12,603.603 INFO:__main__:    self._session_client_evict(['client'])
2023-07-29 10:00:12,604.604 INFO:__main__:  File "/home/neerajpratapsingh/ceph/qa/tasks/cephfs/test_misc.py", line 538, in _session_client_evict
2023-07-29 10:00:12,604.604 INFO:__main__:    self.fs.rank_asok(cmd + ['evict'])
2023-07-29 10:00:12,604.604 INFO:__main__:  File "/home/neerajpratapsingh/ceph/qa/tasks/cephfs/filesystem.py", line 1249, in rank_asok
2023-07-29 10:00:12,604.604 INFO:__main__:    return self.json_asok(command, 'mds', info['name'], timeout=timeout)
2023-07-29 10:00:12,604.604 INFO:__main__:           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2023-07-29 10:00:12,604.604 INFO:__main__:  File "/home/neerajpratapsingh/ceph/qa/tasks/cephfs/filesystem.py", line 267, in json_asok
2023-07-29 10:00:12,604.604 INFO:__main__:    j = json.loads(response_data.replace('inf', 'Infinity'),
2023-07-29 10:00:12,604.604 INFO:__main__:        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2023-07-29 10:00:12,604.604 INFO:__main__:  File "/usr/lib64/python3.11/json/__init__.py", line 359, in loads
2023-07-29 10:00:12,604.604 INFO:__main__:    return cls(**kw).decode(s)
2023-07-29 10:00:12,604.604 INFO:__main__:           ^^^^^^^^^^^^^^^^^^^
2023-07-29 10:00:12,604.604 INFO:__main__:  File "/usr/lib64/python3.11/json/decoder.py", line 337, in decode
2023-07-29 10:00:12,604.604 INFO:__main__:    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
2023-07-29 10:00:12,605.605 INFO:__main__:               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2023-07-29 10:00:12,605.605 INFO:__main__:  File "/usr/lib64/python3.11/json/decoder.py", line 355, in raw_decode
2023-07-29 10:00:12,605.605 INFO:__main__:    raise JSONDecodeError("Expecting value", s, err.value) from None
2023-07-29 10:00:12,605.605 INFO:__main__:json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

This occurred because rank_asok() makes call to json_asok() which tries to deserialize str instance containing a JSON document to a Python object but fails since the response it receives from the cmd passed in test case might returns an err string and not a string with JSON schema, then it fails with the above error and so rank_asok() is basically unusable in negative tests.

This fix should be simple; catch this above exception and raise a RuntimeError with the response string received from the asok command.

[0] https://github.com/ceph/ceph/pull/49974