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epriestley 1e7cc72cd8 Improve performance when marking commits as unreachable after multiple ref deletions
Summary:
See PHI1688. If many refs with a large amount of shared ancestry are deleted from a repository, we can spend much longer than necessary marking their mutual ancestors as unreachable over and over again.

For example, if refs A, B and C all point near the head of an obsolete "develop" branch and have about 1K shared commits reachable from no other refs, deleting all three refs will lead to us performing 3,000 mark-as-unreachable operations (once for each "<ref, commit>" pair).

Instead, we can stop exploring history once we reach an already-unreachable commit.

Test Plan:
  - Destroyed 7 similar refs simultaneously.
  - Ran `bin/repository refs`, saw 7 entries appear in the `oldref` table.
  - Ran `bin/repository discover` with some debugging statements added, saw sensible-seeming behavior which didn't double-mark any newly-unreachable refs.

Differential Revision: https://secure.phabricator.com/D21056
2020-04-03 13:28:42 -07:00
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 Merge a small amount of remaining "libphutil/" code with Phabricator, break libphutil dependency 2020-02-12 15:17:36 -08:00
resources Extract raw commit messages from Git more faithfully across Git versions 2020-02-24 12:37:45 -08:00
scripts Update a Phabricator -> Arcanist include path for scripts in Phabricator 2020-02-14 08:32:26 -08:00
src Improve performance when marking commits as unreachable after multiple ref deletions 2020-04-03 13:28:42 -07:00
support Merge a small amount of remaining "libphutil/" code with Phabricator, break libphutil dependency 2020-02-12 15:17:36 -08:00
webroot Add more layout constraints to tokenizer CSS to prevent layout issues with Chinese glyphs in Firefox 73 2020-02-24 08:00:44 -08:00
.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
.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
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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