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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

This is demonstrated by this functional test patch:

https://review.opendev.org/#/c/686734/

That adds a test which creates a single server create request to create
10 servers and each server has 255 BDMs using the same image and asserts
that the API calls GET /v2/images/{image_id} on the same image 2551
times which is pretty inefficient.

For the lifetime of the server create request we should be smarter and
cache the results of each image we get so we don't make the same
redundant calls to the image service.

** Affects: nova
     Importance: Low
         Status: Confirmed


** Tags: api performance

** Summary changed:

- Inefficient image GET during large boot from volume server create requests
+ Inefficient/redundant image GETs during large boot from volume server create requests with the same image

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https://bugs.launchpad.net/bugs/1846777

Title:
  Inefficient/redundant image GETs during large boot from volume server
  create requests with the same image

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  This is demonstrated by this functional test patch:

  https://review.opendev.org/#/c/686734/

  That adds a test which creates a single server create request to
  create 10 servers and each server has 255 BDMs using the same image
  and asserts that the API calls GET /v2/images/{image_id} on the same
  image 2551 times which is pretty inefficient.

  For the lifetime of the server create request we should be smarter and
  cache the results of each image we get so we don't make the same
  redundant calls to the image service.

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