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epriestley 95fb237ab3 On Git cluster read failure, retry safe requests
Summary:
Depends on D20775. Ref T13286. When a Git read request fails against a cluster and there are other nodes we could safely try, try more nodes.

We DO NOT retry the request if:

  - the client read anything;
  - the client wrote anything;
  - or we've already retried several times.

Although //some// requests where bytes went over the wire in either direction may be safe to retry, they're rare in practice under Git, and we'd need to puzzle out what state we can safely emit.

Since most types of failure result in an outright connection failure and this catches all of them, it's likely to almost always be sufficient in practice.

Test Plan:
  - Started a cluster with one up node and one down node, pulled it.
  - Half the time, hit the up node and got a clean pull.
  - Half the time, hit the down node and got a connection failure followed by a retry and a clean pull.
  - Forced `$err = 1` so even successful attempts would retry.
  - On hitting the up node, got a "failure" and a decline to retry (bytes already written).
  - On hitting the down node, got a failure and a real retry.
  - (Note that, in both cases, "git pull" exits "0" after the valid wire transaction takes place, even though the remote exited non-zero. If the server gave Git everything it asked for, it doesn't seem to care if the server then exited with an error code.)

Maniphest Tasks: T13286

Differential Revision: https://secure.phabricator.com/D20776
2019-09-03 10:08:43 -07:00
bin Remove "bin/accountadmin" and "scripts/user/add_user.php" 2019-08-20 17:58:20 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Remove WePay support from Phortune, and Restful/Httpful dependencies 2019-05-14 09:14:53 -07:00
resources Update Phortune Merchant UI to bring it in line with Account UI 2019-08-22 21:12:33 -07:00
scripts Remove "bin/accountadmin" and "scripts/user/add_user.php" 2019-08-20 17:58:20 -07:00
src On Git cluster read failure, retry safe requests 2019-09-03 10:08:43 -07:00
support Disable the JSHint "function called before it is defined" and "unused parameter" warnings 2019-02-19 15:13:56 -08:00
webroot Make Phortune payment methods transaction-oriented and always support "Add Payment Method" 2019-08-22 21:04:04 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Move web application classes into "phabricator/" 2019-09-02 07:58:59 -07:00
.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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