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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

Public bug reported:

Currently the code in DHCP agent scheduler counts only active agents that host network.
In such case it may allow more agents to host the network than it is configured.

This is creates possibility of race condition when several DHCP agents start up at the same time and try to get active networks.
The network gets hosted by several agents eventhough it might already be hosted by other agents.
This just wastes ports/fixed ips from tenant's network range and increases load on controllers.

It's better to let rescheduling mechanism to sort out active/dead agents
for each of networks.

** Affects: neutron
     Importance: Medium
     Assignee: Eugene Nikanorov (enikanorov)
         Status: New

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https://bugs.launchpad.net/bugs/1506092

Title:
  Count all network-agent bindings during scheduling

Status in neutron:
  New

Bug description:
  Currently the code in DHCP agent scheduler counts only active agents that host network.
  In such case it may allow more agents to host the network than it is configured.

  This is creates possibility of race condition when several DHCP agents start up at the same time and try to get active networks.
  The network gets hosted by several agents eventhough it might already be hosted by other agents.
  This just wastes ports/fixed ips from tenant's network range and increases load on controllers.

  It's better to let rescheduling mechanism to sort out active/dead
  agents for each of networks.

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