[Bug 1376927] Re: [SRU] Configurable block device mapping timeout in compute

[Jorge Niedbalski]

** Patch added: "lp_1376927_trusty.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1376927/+attachment/4237142/+files/lp_1376927_trusty.debdiff

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Title:
  [SRU] Configurable block device mapping timeout in compute

Status in “nova” package in Ubuntu:
  New
Status in “nova” source package in Trusty:
  New
Status in “nova” source package in Utopic:
  New

Bug description:
  [Impact]

  User tried a  ceph storage node intentionally degraded, as a failure test case, on all the cases we hit
  the following exception, 

  2014-07-07 04:07:01.121 1573 TRACE nova.compute.manager [instance:
  63386638-58ac-4a2d-ae3a-20ecc137c5ad] VolumeNotCreated: Volume
  4b6611e2-0e6b-44ec-8066-f8ac164d6a9c did not finish being created even
  after we waited 197 seconds or 180 attempts.

  2014-07-07 04:07:01.121 1573 TRACE nova.compute.manager [instance: 63386638-58ac-4a2d-ae3a-20ecc137c5ad] 
  2014-07-07 04:07:01.750 1573 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: Block Device Mapping is Invalid.

  
  This change adds two configuration options:
   
     a) `block_device_allocate_retries` which can be set in nova.conf
      by the user to configure the number of block device mapping retries.
      It defaults to 60 and replaces the max_tries argument in the above method.

      b) `block_device_allocate_retries_interval` which allows the user
      to specify the time interval between consecutive retries. It defaults to 3
      and replaces wait_between argument in the above method.

  
  [Regression Potential] 

   *  This change introduces two new nova.conf directives, both with
  default values that shouldn't broken previous deployments.

  
  [Other Info]
   
  Please refer upstream commit: 
  https://git.openstack.org/cgit/openstack/nova/commit/?id=66721eb2c0f53fc4260b2f0aa9a3811da0f7ddbd

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