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epriestley 9cbbbe2a87 Execute project membership materialization as "SELECT" + "INSERT", not "INSERT ... SELECT" 
Summary:
Ref T13596. See that task for discussion. Executing "INSERT ... SELECT" at default isolation levels requires more locking than executing "SELECT" + "INSERT" separately.

Decompose this "INSERT ... SELECT" into "SELECT + INSERT", and reformat it to execute a minimal set of changes instead of wiping everything out and then writing all of it back. In most cases, this means we write 1 row instead of `O(number of project members)` rows.

Test Plan:
  - Created a project. Added and removed members, looked at database and saw a consistent membership/materialization list.
  - Created a subproject. Added and removed members, looked at database and saw a consistent membership/materialization list.

I wasn't successful in reproducing the LOCK WAIT issue locally by trying various concurrent SELECT / INSERT / INSERT ... SELECT strategies. It may depend on the "DELETE + INSERT ... SELECT" structure used here, or versions/config/etc, so we'll have to see how that fares in production.

Maniphest Tasks: T13596

Differential Revision: https://secure.phabricator.com/D21527
2021-01-28 09:04:44 -08:00
bin Remove the "ssh-auth-key" script 2019-10-28 17:52:37 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Update SES API to use AWSv4 signatures 2020-09-15 13:03:49 -07:00
resources Set an explicit height when drawing the dependent revision graph 2020-10-16 14:10:36 -07:00
scripts Improve the quality of SSH error messages 2020-06-16 08:59:36 -07:00
src Execute project membership materialization as "SELECT" + "INSERT", not "INSERT ... SELECT" 2021-01-28 09:04:44 -08:00
support Fix reading of the request path when running the PHP builtin webserver 2021-01-11 10:54:40 -08:00
webroot Set an explicit height when drawing the dependent revision graph 2020-10-16 14:10:36 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Continue moving classes with no callers in libphutil or Arcanist to Phabricator 2020-02-12 13:14:04 -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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