Allow Swift fallocate_reserve to be set per service

[Andy McCrae]

When swift drives fill up completely it becomes difficult to administrate - you can't delete objects since this requires a write (of a tombstone file).

There is a built in fallocate_reserve value (per service) that will allow a set amount of space to be seen as "full", by the swift storage services, without actually being in use.

We should expose this value and default it to something smallish (e.g. 10GB since max swift write is 5GB).

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/279589

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/287912

[OpenStack Infra (hudson-openstack)]

Change abandoned by Andy McCrae (<email address hidden>) on branch: master
Review: https://review.openstack.org/279589
Reason: Moving repos

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/287912
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_swift/commit/?id=81aecda55fd612ff095f1546521b48dd0216ffbd
Submitter: Jenkins
Branch: master

commit 81aecda55fd612ff095f1546521b48dd0216ffbd
Author: Andy McCrae <email address hidden>
Date: Fri Feb 12 15:04:49 2016 +0000

    Expose and set a default fallocate_reserve value

    When swift disks fill up completely it becomes difficult to perform
    operations since delete operations require a write.

    By setting this value we can ensure that PUT requests won't happen when
    the disk space is below the threshold set (in bytes). This will not
    govern rsyncs, which can still happen to fill up the disks, but assuming
    a reasonably uniform distribution of data this should help prevent disks
    from filling up.

    Change-Id: I753de5e5ed09a21571575ef51c38752edc0730cb
    Closes-Bug: #1545018

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/312780

[Kevin Carter (kevin-carter)]

Fix for liberty has been created here: https://review.openstack.org/312784

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/312780
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_swift/commit/?id=ca1d2fe0574f68bd515eb22f981bd3920d611561
Submitter: Jenkins
Branch: stable/mitaka

commit ca1d2fe0574f68bd515eb22f981bd3920d611561
Author: Andy McCrae <email address hidden>
Date: Fri Feb 12 15:04:49 2016 +0000

    Expose and set a default fallocate_reserve value

    When swift disks fill up completely it becomes difficult to perform
    operations since delete operations require a write.

    By setting this value we can ensure that PUT requests won't happen when
    the disk space is below the threshold set (in bytes). This will not
    govern rsyncs, which can still happen to fill up the disks, but assuming
    a reasonably uniform distribution of data this should help prevent disks
    from filling up.

    Change-Id: I753de5e5ed09a21571575ef51c38752edc0730cb
    Closes-Bug: #1545018
    (cherry picked from commit 81aecda55fd612ff095f1546521b48dd0216ffbd)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/312784
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=96aee26133fbf29cee2fb179cfddeea3142276f9
Submitter: Jenkins
Branch: liberty

commit 96aee26133fbf29cee2fb179cfddeea3142276f9
Author: Kevin Carter <email address hidden>
Date: Wed May 4 18:27:22 2016 -0500

    Expose and set a default fallocate_reserve value

    When swift disks fill up completely it becomes difficult to perform
    operations since delete operations require a write.

    By setting this value we can ensure that PUT requests won't happen when
    the disk space is below the threshold set (in bytes). This will not
    govern rsyncs, which can still happen to fill up the disks, but assuming
    a reasonably uniform distribution of data this should help prevent disks
    from filling up.

    Change-Id: I753de5e5ed09a21571575ef51c38752edc0730cb
    Closes-Bug: #1545018
    (cherry picked from commit 81aecda55fd612ff095f1546521b48dd0216ffbd)
    Signed-off-by: Kevin Carter <email address hidden>

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/openstack-ansible 12.0.13 release.

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/openstack-ansible-os_swift 13.1.2 release.

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/openstack-ansible-os_swift 14.0.0.0b1 development milestone.