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[Ian Wienand <iwienand@xxxxxxxxxx>]

Public bug reported:

A dhcp resync can be triggered at a number of points, but the actual
resync is done asynchronously by a helper thread. This means by the time
the resync happens, it's hard to establish what actually caused it.

I've seen a number of problems in production systems that cause
excessive resyncs. One is a ipv6/dnsmasq issue (rhbz#1077487) and
another is db corruption with duplicate entries [1]. The resync triggers
a whole lot of logs itself, so it becomes very unclear how to establish
any causality.

What I propose is to keep track of what triggered the resync with some
helpful information.

[1] The logs will contain output like "DBDuplicateEntry
(IntegrityError) (1062, "Duplicate entry
'6d799c6a-7a09-4c1e-bb63-7d30fd052c8a-d3e3ac5b-9962-428a-a9f8-6b2' for
key 'PRIMARY'") ..." in this case

** Affects: neutron
     Importance: Undecided
     Assignee: Ian Wienand (iwienand)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1294445

Title:
  Record and log reason for dhcp agent resync

Status in OpenStack Neutron (virtual network service):
  In Progress

Bug description:
  A dhcp resync can be triggered at a number of points, but the actual
  resync is done asynchronously by a helper thread. This means by the
  time the resync happens, it's hard to establish what actually caused
  it.

  I've seen a number of problems in production systems that cause
  excessive resyncs. One is a ipv6/dnsmasq issue (rhbz#1077487) and
  another is db corruption with duplicate entries [1]. The resync
  triggers a whole lot of logs itself, so it becomes very unclear how to
  establish any causality.

  What I propose is to keep track of what triggered the resync with some
  helpful information.

  [1] The logs will contain output like "DBDuplicateEntry
  (IntegrityError) (1062, "Duplicate entry
  '6d799c6a-7a09-4c1e-bb63-7d30fd052c8a-d3e3ac5b-9962-428a-a9f8-6b2' for
  key 'PRIMARY'") ..." in this case

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