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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Changed in: nova
   Importance: Medium => Low

** Changed in: nova
       Status: Confirmed => Opinion

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https://bugs.launchpad.net/bugs/1420662

Title:
  VMware: InstanceList.get_by_host raise rpc timeout error

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  I deploy my OpenStack with VMware driver, one nova-compute connect to
  VMware deployment, there are about 3000 VMs in VMware deployment. I
  use mysql.

  The method of InstanceList.get_by_host rasie rpc timeout error when
  ComputeManager.init_host() and _sync_power_states periodic task
  execute.

  Looks like a performance issue. currently, one nova-compute host map
  to the whole VMware deployment that maybe contain several clusters in
  nova VMware driver. When InstanceList.get_by_host execute in
  ComputeManager, it indicate that nova-compute will execute a rpc call
  to nova-conducutor, nova-conductor will fetch a lots of instances in
  the whole VMware deployment in once, in my case , it's 3000 instances.
  The long time SQL query maybe lead to the nova-conductor rpc timeout.

  PS: 
  vSphere 5.1 now allows 100 hosts and 3000 powered on VMs.
  vSphere 6 now allows 1000 hosts and 10,000 powered on VMs.

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