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epriestley 40cc403d23 Allow the Trigger daemon to hibernate, reducing processes to 0
Summary:
Ref T12298. The trigger daemon already has routine long-term sleep, and few external events can impact when it should ideally wake up. The relevant events are:

  - Someone creates a new Nuance source (ideally, we should wake up right away and start polling it).
  - Someone creates a Calendar event about 16 minutes in the future (ideally, we should send them a reminder in about a minute).
  - Someone changes GC config to be extremely aggressive (ideally, we should immediately respect the change).

None of these cases are very important. We don't hibernate for more than 3 minutes, so the worst case is that your Nuance source takes 3 minutes to start importing or your Calendar notification comes two minutes too late (13 minutes before the event instead of 15).

This change makes GC sightly more CPU-expensive on average: currently, we do a GC sweep every 4 hours. After this change, we'll end up doing one every 3 minutes, because we lose the fact that we did a sweep recently when the daemon restarts.

We could fix this by keeping track of when the last GC sweep was in the database, instead of in the Daemon process, but the cost of a sweep is normally very small so I don't plan to do this anytime soon.

Test Plan:
  - Ran `bin/phd debug trigger`, saw daemon go through 3-minute hibernate + restart cycles.
  - Ran `bin/phd debug task`, saw daemon run normally.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12298

Differential Revision: https://secure.phabricator.com/D17408
2017-02-24 10:54:05 -08:00
bin Remove most of the legacy hunk code 2016-12-13 14:34:36 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Implement new reCAPTCHA interface 2017-02-03 20:06:29 +00:00
resources Add a "Red/Green Colorblind" accessibility mode, make all web UIs and email respect it 2017-02-23 10:57:39 -08:00
scripts Add some sort of sort to Emoji Autocomplete 2017-01-24 20:21:06 -08:00
src Allow the Trigger daemon to hibernate, reducing processes to 0 2017-02-24 10:54:05 -08:00
support Don't combine automatic output compression with "Content-Length" 2016-12-13 14:25:49 -08:00
webroot Hide Conpherence durable column when printing 2017-02-22 12:31:05 -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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