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epriestley a1baedbd9a Lock resources briefly while acquiring leases on them to prevent acquiring near-death resources
Summary:
Depends on D19078. Ref T13073. Currently, there is a narrow window where we can acquire a resource after a reclaim has started against it.

To prevent this, briefly lock resources before acquiring them and make sure they're still good. If a resource isn't good, throw the lease back in the pool.

Test Plan:
This is tricky. You need:

  - Hoax blueprint with limits and a rule where leases of a given "flavor" can only be satisfied by resources of the same flavor.
  - Reduce the 3-minute "wait before resources can be released" to 3 seconds.
  - Limit Hoaxes to 1.
  - Allocate one "cherry" flavored Hoax and release the lease.
  - Add a `sleep(15)` to `releaseResource()` in `DrydockResourceUpdateWorker`, after the `canReclaimResource()` check, with a `print`.

Now:

  - Run `bin/phd debug task` in two windows.
  - Run `bin/drydock lease --type host --attributes flavor=banana` in a third window.
  - This will start to reclaim the existing "cherry" resource. Once one of the `phd` windows prints the "RECLAIMING" message run `bin/drydock lease --type host --attributes flavor=cherry` in a fourth window.
  - Before patch: the "cherry" lease acquired immediately, then was released and destroyed moments later.
  - After patch: the "cherry" lease yields.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13073

Differential Revision: https://secure.phabricator.com/D19080
2018-02-13 13:22:13 -08:00
bin Add skeleton code for webhooks 2018-02-09 13:55:04 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Rename HarbormasterBuildMessage "buildTargetPHID" to "receiverPHID" 2018-02-12 12:17:44 -08:00
scripts When bin/drydock lease is interrupted, release leases 2018-02-13 13:14:21 -08:00
src Lock resources briefly while acquiring leases on them to prevent acquiring near-death resources 2018-02-13 13:22:13 -08:00
support Always setlocale() to en_US.UTF-8 for the main process 2018-02-05 12:23:06 -08:00
webroot Add inline comment counts to the filetree view 2018-02-08 17:15:36 -08:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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