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epriestley 51073b972e Try to route cluster writes to nodes which won't need to synchronize first 
Summary:
Ref T13109. Ref T13202. See PHI905. See PHI889. When we receive a write to a repository cluster, we currently send it to a random writable node.

Instead, we can prefer:

  - the node currently holding the write lock; or
  - any node which is already up to date.

These should simply be better nodes to take writes in all cases. The write lock is global for the repository, so there's no scaling benefit to spreading writes across different nodes, and these particular nodes will be able to accept the write more quickly.

Test Plan:
  - This is observable by using `fprintf(STDERR, "%s\n", ...)` in the logic, then running `git push`. I'd like to pull this routing logic out of `PhabricatorRepository` at some point, probably into a dedicated `ClusterURIQuery` sort of class, but that is a larger change.
  - Added some `fprintf(...)` stuff around which nodes were being selected.
  - Added a `sleep(10)` after grabbing the write lock.
  - In one window, pushed. Then pushed in a second window.
    - Saw the second window select the lock holder as the write target based on it currently holding the lock.
    - Without a concurrent push, saw pushes select up-to-date nodes based on their up-to-date-ness.

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: joshuaspence, timhirsh

Maniphest Tasks: T13202, T13109

Differential Revision: https://secure.phabricator.com/D19734
2018-10-17 08:08:25 -07:00
bin Add a "lock log" for debugging where locks are being held 2018-03-05 17:55:34 -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 Add an explicit "max-width" to PHUIDocumentPro pages to force large tables to scroll 2018-10-01 13:15:59 -07:00
scripts Remove outdated "rebuild_summaries.php" script 2018-09-06 08:18:47 -07:00
src Try to route cluster writes to nodes which won't need to synchronize first 2018-10-17 08:08:25 -07:00
support Append the intermediate chain to the "cert" parameter in Aphlict 2018-06-26 19:34:28 +00:00
webroot Add an explicit "max-width" to PHUIDocumentPro pages to force large tables to scroll 2018-10-01 13:15:59 -07:00
.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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