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[Bug 1483335] [NEW] ExtendedVolumes extension has poor performance

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: "Choe, Cheng-Dae" <1483335@xxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Aug 2015 16:29:42 -0000
Reply-to: Bug 1483335 <1483335@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

ExtendedVolumes has poor performance because it query block device
mapping formance for every instances.

that's because block_device_mapping_get_all_by_instance() only takes on instance_uuid.
if this function taks instance_uuid list. then we can have better performance with IN operator with just on query.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1483335

Title:
  ExtendedVolumes extension has poor performance

Status in OpenStack Compute (nova):
  New

Bug description:
  ExtendedVolumes has poor performance because it query block device
  mapping formance for every instances.

  that's because block_device_mapping_get_all_by_instance() only takes on instance_uuid.
  if this function taks instance_uuid list. then we can have better performance with IN operator with just on query.

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