RHV: hosts are not responding, seeing 'Too many tasks' error

Solution Verified - Updated -

Issue

  • Host is not responding, following error is shown in the engine:
Unable to RefreshCapabilities: VDSNetworkException: VDSGenericException: VDSNetworkException: Not enough resources: {'reason': 'Too many tasks', 'resource': 'jsonrpc', 'current_tasks': 80}
  • Supervdsm is not generating logs in the hypervisor.
  • Supervdsm is not responding to network_caps() from VDSM
  • VDSM has several tasks blocked on getCapabilities()

Environment

  • Red Hat Virtualization 4.2
    • vdsm-4.20.39.1-1.el7ev.x86_64
    • libvirt-3.9.0-14.el7_5.7.x86_64

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