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[Launchpad Bug Tracker <1496844@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1496844

Title:
  restart dhcp-agent shouldn't rebuild all dhcp-driver even nothing
  changed

Status in neutron:
  Expired

Bug description:
  When dhcp-agent is restarted, it will restart all dhcp-drivers even no configurations or networks changed.
  It's not a big deal in a small scale.
  But in a big scale, like a dhcp-agent handles hundreds of networks, it will be quite a big cost to rebuild all these dhcp-drivers.

  In our environment, a dhcp-agent which has more than 300 networks
  binding onto it, will cost more than 2 mins to totally recover to
  work. Indeed, nothing changed before we try to restart that dhcp-
  agent.

  It's better to work in a "lazy" mode, like only restart dhcp-drivers
  when their configure files need be changed.

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