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[Isaku Yamahata <1609184@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Allow retry on db retriable error by precommit mothod.

Currently ML2 driver manager swallows all exceptions by mechanism driver and return errors to user.
However, there are classes of retriable db errors(DBDeadlock, taleDataError, DDuplicateEntry, TretryRequest).
With those error by precommit, it's better to allow neutron.api.v2.base.Controller to retry request.

Sometimes, those db error by precommit is inevitable. Especially subnet
operation touches many resources(port, ip address, etc).

** Affects: neutron
     Importance: Undecided
     Assignee: Isaku Yamahata (yamahata)
         Status: New


** Tags: ml2 rfe

** Tags added: rfe

** Tags added: ml2

** Changed in: neutron
     Assignee: (unassigned) => Isaku Yamahata (yamahata)

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https://bugs.launchpad.net/bugs/1609184

Title:
  [RFE] ML2: Allow retry on db error by precommit

Status in neutron:
  New

Bug description:
  Allow retry on db retriable error by precommit mothod.

  Currently ML2 driver manager swallows all exceptions by mechanism driver and return errors to user.
  However, there are classes of retriable db errors(DBDeadlock, taleDataError, DDuplicateEntry, TretryRequest).
  With those error by precommit, it's better to allow neutron.api.v2.base.Controller to retry request.

  Sometimes, those db error by precommit is inevitable. Especially
  subnet operation touches many resources(port, ip address, etc).

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