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[Dave Walker <email@xxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1557640

Title:
  DHCP agent logging is causing performance issues

Status in neutron:
  Fix Released
Status in neutron kilo series:
  New

Bug description:
  When a new port gets added or removed, the DHCP agent is currently
  dumping the entirety of the hosts file in the logs. This is a problem
  in some deployments we have encountered, some of which with upwards of
  10000 ports.

  Change-Id: I3ad7864eeb2f959549ed356a1e34fa18804395cc removed logging
  calls from inside the loop. It also added two new log calls: one at
  the beginning of the loop that builds the hosts file in memory and one
  at the end, that also includes the full content. Those could be useful
  pieces of debugging information. However, adding the host file
  contents can get expensive when there are large numbers of ports.

  For large numbers of ports, it can take more than one hour for the
  agent to sync up. The log output contributes a significant amount of
  that time.

  This was introduced in Liberty. One reviewer at the time had already
  expressed concerns about the impact of the log call.

  Will propose a patch to keep the log message, but remove the file
  contents.

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