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[Bug 1269577] [NEW] Glance doesn't use workable eventlet hubs when the default is unavailable

 

Public bug reported:

Glance currently sets the eventlet hub based on config. The default if this config is not given is to use the 'poll' hub. On platforms where 'poll' is not available, Glance refuses to launch workers.
However, there are other hubs that are sufficiently reliable to warrant including them in the default list. In particular, on OS X, 'selects' works and should be used as the default when 'poll' is not found. The behavior should only change if no configuration value is given for eventlet_hub.

** Affects: glance
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1269577

Title:
  Glance doesn't use workable eventlet hubs when the default is
  unavailable

Status in OpenStack Image Registry and Delivery Service (Glance):
  New

Bug description:
  Glance currently sets the eventlet hub based on config. The default if this config is not given is to use the 'poll' hub. On platforms where 'poll' is not available, Glance refuses to launch workers.
  However, there are other hubs that are sufficiently reliable to warrant including them in the default list. In particular, on OS X, 'selects' works and should be used as the default when 'poll' is not found. The behavior should only change if no configuration value is given for eventlet_hub.

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