Option to disable Nova quotas

[Ryan Moe]

Concurrent requests suffer a significant performance penalty due to how nova manages quotas in the db. Quotas can be disabled by using the NoopQuotaDriver in nova.conf.

[Mike Scherbakov (mihgen)]

We vote for checkbox on UI, quotas disabled by default.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/71417

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/71427

[Mike Scherbakov (mihgen)]

When we disable Nova quotas, does Horizon behave normally? There was bug a long time ago: https://bugs.launchpad.net/horizon/+bug/971937, I'm wondering what's the current status on this. Do we have to do any configuration to Horizon to ignore quotas or it's tracked automatically?

[Ryan Moe (rmoe)]

That change was to support unlimited quotas, not disabled quotas. There are two OSCI tickets (1041 and 1042) that we will need to make disabled quotas work in Horizon.

There are two reasons Horizon doesn't work with the noop driver. One is that the noop driver doesn't return quota information in the same format as the db driver, that's what 1041 fixes. When using the noop driver the net effect is that every quota value is -1 which Horizon equates to float('inf'). This exposes a bug in a Django template tag where it tries to calculate things like infinity/infinity. This is what 1042 fixes. I also created a ticket in Django about it (https://code.djangoproject.com/ticket/21959).

[Mike Scherbakov (mihgen)]

Ryan, should we file a blueprint for providing checkbox to enable/disable quotas, or it is already tracked somewhere?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/71417
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=601c0c106ae85b2e164731a202a195dce16f1dde
Submitter: Jenkins
Branch: master

commit 601c0c106ae85b2e164731a202a195dce16f1dde
Author: Ryan Moe <email address hidden>
Date: Wed Feb 5 15:26:42 2014 -0800

    Add option to enable Nova quotas

    Change-Id: Ia18fc90be1d3d1d66f69da92f1963d9c88e4ce16
    Related-bug: #1275987

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/71427
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=764b639dc0bbb644db8b5cef3e27b3986a6cd7ed
Submitter: Jenkins
Branch: master

commit 764b639dc0bbb644db8b5cef3e27b3986a6cd7ed
Author: Ryan Moe <email address hidden>
Date: Wed Feb 5 15:29:59 2014 -0800

    Set Nova quota driver based on Fuel setting

    This change also effectively disables quotas by setting the
    driver to NoopQuotaDriver as the default.

    Change-Id: I64f73bf456c839de5f2954103603179536730269
    Closes-bug: #1275987

[Nikolay Fedotov (nfedotov)]

Verified on ISO: {"build_id": "2014-03-16_03-01-16", "mirantis": "yes", "build_number": "31", "nailgun_sha": "2ace3ab436fef250e414ba3fa577198f7de4a92e", "ostf_sha": "0ad6f6de46e615022c2672c345a11fb44ffaa4e1", "fuelmain_sha": "7acc547eb531d4a15b5d3361a2ea308a4ea4ced2", "astute_sha": "a80acd1312be70676f0dd936814b27ce01fb013d", "release": "5.0", "fuellib_sha": "0f2765736a2e4af7265eeb936161f0a90cdc9a2e"}