Description of problem:

vdsm-gluster tries to run heal operations on all volumes. It fails to run on a single node volume that causes vdsm to timeout and stop communication with the engine and will go offline. 

Version-Release number of selected component (if applicable):


How reproducible:

Always


Steps to Reproduce:
1. Create a single brick/node volume in Gluster that is apart of a RHEV cluster

Like the following.

Volume Name: rhev_export
Type: Distribute
Volume ID: ebd22164-41cf-45be-8fb4-c8f684ada43e
Status: Started
Snapshot Count: 0
Number of Bricks: 1
Transport-type: rdma
Bricks:
Brick1: 100.64.78.11:/gluster/brick/rhev_export
Options Reconfigured:
network.ping-timeout: 30
server.allow-insecure: on
storage.owner-gid: 36
storage.owner-uid: 36
network.remote-dio: enable
performance.low-prio-threads: 32
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
auth.allow: *
user.cifs: off
nfs.disable: on
nfs-ganesha: enable
cluster.enable-shared-storage: enable

2. Wait for VDSM to go offline.


Actual results:

==> /var/log/vdsm/mom.log <==
2018-07-30 07:55:26,729 - mom.VdsmRpcBase - ERROR - Command Host.getAllVmStats with args {} failed:
(code=1100, message=Not enough resources: {'reason': 'Too many tasks', 'resource': 'jsonrpc', 'current_tasks': 80})

==> /var/log/vdsm/vdsm.log <==
2018-07-30 07:55:32,647-0400 WARN  (vdsm.Scheduler) [Executor] Worker blocked: <Worker name=jsonrpc/5 running <Task <JsonRpcTask {'params': {u'volumeName': u'rhev_export'}, 'jsonrpc': '2.0', 'method': u'GlusterVolume.healInfo', 'id': u'9daf4941-c9fb-4387-a51e-cadcae22272f'} at 0x7f3148341390> timeout=60, duration=41880 at 0x7f3148341450> task#=29967 at 0x7f316c070950>, traceback:
File: "/usr/lib64/python2.7/threading.py", line 785, in __bootstrap
  self.__bootstrap_inner()
File: "/usr/lib64/python2.7/threading.py", line 812, in __bootstrap_inner
  self.run()
File: "/usr/lib64/python2.7/threading.py", line 765, in run
  self.__target(*self.__args, **self.__kwargs)
File: "/usr/lib/python2.7/site-packages/vdsm/common/concurrent.py", line 194, in run
  ret = func(*args, **kwargs)
File: "/usr/lib/python2.7/site-packages/vdsm/executor.py", line 301, in _run
  self._execute_task()
File: "/usr/lib/python2.7/site-packages/vdsm/executor.py", line 315, in _execute_task
  task()
File: "/usr/lib/python2.7/site-packages/vdsm/executor.py", line 391, in __call__
  self._callable()
File: "/usr/lib/python2.7/site-packages/yajsonrpc/__init__.py", line 523, in __call__
  self._handler(self._ctx, self._req)
File: "/usr/lib/python2.7/site-packages/yajsonrpc/__init__.py", line 566, in _serveRequest
  response = self._handle_request(req, ctx)
File: "/usr/lib/python2.7/site-packages/yajsonrpc/__init__.py", line 606, in _handle_request
  res = method(**params)
File: "/usr/lib/python2.7/site-packages/vdsm/rpc/Bridge.py", line 197, in _dynamicMethod
  result = fn(*methodArgs)
File: "/usr/lib/python2.7/site-packages/vdsm/gluster/apiwrapper.py", line 129, in healInfo
  return self._gluster.volumeHealInfo(volumeName)
File: "/usr/lib/python2.7/site-packages/vdsm/gluster/api.py", line 90, in wrapper
  rv = func(*args, **kwargs)
File: "/usr/lib/python2.7/site-packages/vdsm/gluster/api.py", line 776, in volumeHealInfo
  return {'healInfo': self.svdsmProxy.glusterVolumeHealInfo(volumeName)}
File: "/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 55, in __call__
  return callMethod()
File: "/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 53, in <lambda>
  **kwargs)
File: "<string>", line 2, in glusterVolumeHealInfo
File: "/usr/lib64/python2.7/multiprocessing/managers.py", line 759, in _callmethod
  kind, result = conn.recv() (executor:363)
2018-07-30 07:55:34,025-0400 INFO  (periodic/0) [vdsm.api] START repoStats(domains=()) from=internal, task_id=7a0d264c-dd13-4b77-a1ef-bed4637e7017 (api:46)
2018-07-30 07:55:34,025-0400 INFO  (periodic/0) [vdsm.api] FINISH repoStats return={} from=internal, task_id=7a0d264c-dd13-4b77-a1ef-bed4637e7017 (api:52)
2018-07-30 07:55:34,025-0400 INFO  (periodic/0) [vdsm.api] START multipath_health() from=internal, task_id=0d984935-c93d-4ef5-98ee-d3f5a5109c8c (api:46)
2018-07-30 07:55:34,025-0400 INFO  (periodic/0) [vdsm.api] FINISH multipath_health return={} from=internal, task_id=0d984935-c93d-4ef5-98ee-d3f5a5109c8c (api:52)

==> /var/log/vdsm/mom.log <==
2018-07-30 07:55:34,026 - mom.RPCServer - INFO - ping()
2018-07-30 07:55:34,027 - mom.RPCServer - INFO - getStatistics()
2018-07-30 07:55:41,745 - mom.VdsmRpcBase - ERROR - Command Host.getAllVmStats with args {} failed:
(code=1100, message=Not enough resources: {'reason': 'Too many tasks', 'resource': 'jsonrpc', 'current_tasks': 80})


Expected results:

Heal operations do not run or skipped and the host remains online.


Additional info: