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["Chris St. Pierre" <1366139@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The nova metadata request handler uses an in-memory cache of 15 seconds.
Under very heavy usage of the metadata service, this can drastically
limit the cache hit rate, since it expires so quickly.

Adding the ability to control the cache timeout has, in our tests,
increased the average cache hit rate from around 20% to 80% or better
with approximately a thousand metadata calls per minute.

** Affects: nova
     Importance: Undecided
     Assignee: Chris St. Pierre (stpierre)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1366139

Title:
  Metadata cache time should be configurable

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  The nova metadata request handler uses an in-memory cache of 15
  seconds. Under very heavy usage of the metadata service, this can
  drastically limit the cache hit rate, since it expires so quickly.

  Adding the ability to control the cache timeout has, in our tests,
  increased the average cache hit rate from around 20% to 80% or better
  with approximately a thousand metadata calls per minute.

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