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epriestley 138efb2b10 Recover from a race when importing external objects (like JIRA issues) for the first time
Summary:
Fixes T11604. If we send two requests to render a brand new tag at about the same time (say, 50ms apart) but JIRA takes more than 50ms to return from its API call, the two processes will race one another and try to save the same external object.

If they do, have whichever one lost the race just load the object the other one created.

Apply this to other bridges, too.

Test Plan:
  - Created a new task in JIRA.
  - Referenced it for the first time in Differential, in a comment.
  - This causes two tag renders to fire. This //might// be a bug but I spend 30 seconds on it without figuring out what was up. Regardless, we should fix the race even if the reason it's triggering so easily legitimately is a bug.
  - Before patch: big error dialog (as in T11604).
  - After patch: smooth sailing.

{F1804008}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11604

Differential Revision: https://secure.phabricator.com/D16514
2016-09-07 11:16:42 -07:00
bin Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Improve Amazon SES code error handling behavior 2016-04-05 17:28:45 -07:00
resources Add a few more high contrast CSS rules 2016-09-07 11:03:05 -07:00
scripts Continue on bad database configuration from select scripts 2016-09-06 14:20:57 -07:00
src Recover from a race when importing external objects (like JIRA issues) for the first time 2016-09-07 11:16:42 -07:00
support Blanket reject request which may have been poisoned by a "Proxy" header to mitigate the httpoxy vulnerability 2016-07-21 20:18:06 -07:00
webroot Add a few more high contrast CSS rules 2016-09-07 11:03:05 -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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