lp:~ewanmellor/nova/xenapi-concurrency-model

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Merged into lp:~hudson-openstack/nova/trunk at revision 252

Jay Pipes (community): Approve on 2010-08-24

justinsb (community): Approve on 2010-08-21

OZAWA Tsuyoshi: Pending requested 2010-08-19

Rick Clark: Pending requested 2010-08-19

termie: Pending requested 2010-08-19

Diff: 315 lines (+144/-31)

2 files modified

nova/utils.py (+8/-0)
nova/virt/xenapi.py (+136/-31)

api

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232. By Ewan Mellor on 2010-08-19

Move deferredToThread into utils, as suggested by termie.

231. By Ewan Mellor on 2010-08-19

Remove whitespace to match style guide.

230. By Ewan Mellor on 2010-08-17

Merge with trunk, in particular merging with the style cleanup that caused
conflicts with this branch.

229. By Ewan Mellor on 2010-08-15

Rework virt.xenapi's concurrency model. There were many places where we were
inadvertently blocking the reactor thread. The reworking puts all calls to
XenAPI on background threads, so that they won't block the reactor thread.

Long-lived operations (VM start, reboot, etc) are invoked asynchronously
at the XenAPI level (Async.VM.start, etc). These return a XenAPI task. We
relinquish the background thread at this point, so as not to hold threads in
the pool for too long, and use reactor.callLater to poll the task.

This combination of techniques means that we don't block the reactor thread at
all, and at the same time we don't hold lots of threads waiting for
long-running operations.

There is a FIXME in here: get_info does not conform to these new rules.
Changes are required in compute.service before we can make get_info
non-blocking.

228. By Ewan Mellor on 2010-08-12

Implement the same fix as lp:~vishvananda/nova/fix-curl-project, but for virt.xenapi.

227. By Ewan Mellor on 2010-08-12

Fix exception in get_info.

226. By Ewan Mellor on 2010-08-11

Added a xapi plugin that can pull images from nova-objectstore, and use that
to get a disk, kernel, and ramdisk for the VM.

225. By Vish Ishaya on 2010-08-11

Improved roles functionality (listing & improved test coverage)

224. By Michael Gundlach on 2010-08-11

updated virtualenv to add eventlet, which is now a requirement

223. By Jay Pipes on 2010-08-11

Changes the run_tests.sh and /tools/install_venv.py scripts to be
more user-friendly and not depend on PIP while not in the virtual
environment.