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epriestley bc6c8c0e93 Explicitly shuffle nodes before selecting one for cluster sync 
Summary:
Depends on D19734. Ref T13202. Ref T13109. Ref T10884. See PHI905. See PHI889. We currently rank cluster nodes in three cases:

  # when performing a write, we can go to any node (D19734 should make our ranking good);
  # when performing a read, we can go to any node (currently random, but T10884 discusses ideas to improve our ranking);
  # when performing an internal synchronization before a read or a write, we must go to an up-to-date node.

Currently, case (3) is not-exactly-deterministic but not random, and we won't spread intracluster traffic acrosss the cluster evenly if, say, half of it is up to date and half of it is still synchronizing. For a given write, I believe all nodes will tend to synchronize from whichever node first received the write today.

Instead, shuffle the list and synchronize from any up-to-date node.

(I think we could improve upon this only by knowing which nodes actually have load and selecting the least-loaded -- doable, but not trivial.)

Test Plan: Poked at it locally, will deploy to `secure`. This is hard to measure/test terribly convincingly.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13202, T13109, T10884

Differential Revision: https://secure.phabricator.com/D19735
2018-10-17 08:11:23 -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scripts Remove outdated "rebuild_summaries.php" script 2018-09-06 08:18:47 -07:00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 Explicitly shuffle nodes before selecting one for cluster sync 2018-10-17 08:11:23 -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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