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epriestley 7168d8edd9 Make Drydock reclaim unused resources when it reaches a resource limit 
Summary:
Fixes T9994. Currently, when Drydock can't allocate a new resource because some limit has been reached, it waits patiently for a resource to become available.

It is possible that no resource will ever become available. Particularly with "Working Copy" resources, the new lease may want a copy of `rB`, but the resource may already be maxed out on `rA`.

Right now, no process exists to automatically reclaim the unused `rA`.

When we encounter this situation, try to reclaim one of the other resources if it is just sitting there unused.

Specifically:

  - Add a "reclaim" command which means "release this resource //if// it is completely unused".
  - Add a `bin/drydock reclaim` to send this command to every active resource.
  - When we try to acquire a resource and can't, but only because of some kind of limit / utilization problem, try to release an unused resource to free up some room.

Test Plan:
  - Set "Working Copy" resource limit to 1.
  - Ran "Test Configuration" in `rA`, which worked.
  - Ran "Test Configuration" in `rB`, which hung forever.
  - Applied patch.
  - Ran "Test Configuration" in `rB`, saw it reclaim the `rA` resource, use the slot, then succeed.
  - Ran "Test Configuration" in `rA` again, saw it grab the slot back.
  - Ran `bin/drydock reclaim` and saw it reclaim a bunch of old orphaned resources.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9994

Differential Revision: https://secure.phabricator.com/D14819
2015-12-18 11:55:51 -08:00
bin Provide bin/garbage for interacting with garbage collection 2015-10-02 09:17:24 -07:00
conf Mark some strings for translation 2015-06-09 23:06:52 +10:00
externals Remove skins from Phame 2015-12-11 08:14:12 -08:00
resources Update the Celerity map. 2015-12-17 15:38:03 -08:00
scripts Add a lock to storage upgrade and adjustment 2015-12-02 06:18:28 +11:00
src Make Drydock reclaim unused resources when it reaches a resource limit 2015-12-18 11:55:51 -08:00
support Add a "Startup" to DarkConsole 2015-08-21 14:53:29 -07:00
webroot Indent multiple items from the same application in Quick Create menu 2015-12-17 15:24:46 -08:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Apply phutil XHPAST linter standard 2015-11-13 07:09:12 +11:00
.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 Add custom Cows and Figlet directories to .gitignore 2015-10-08 20:23:05 -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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