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HAProxy - Load balancer
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Willy Tarreau f9a7c442f6 MINOR: backend: only skip LB when there are actual connections 
In 2.3, a significant improvement was brought against situations where
the queue was heavily used, because some LB algos were still checked
for no reason before deciding to put the request into the queue. This
was commit 82cd5c13a ("OPTIM: backend: skip LB when we know the backend
is full").

As seen in previous commit ("BUG/MAJOR: queue: set SF_ASSIGNED when
setting strm->target on dequeue") the dequeuing code is extremely
tricky, and the optimization above tends to emphasize transient issues
by making them permanent until the next reload, which is not acceptable
as the code must always be robust against any bad situation.

This commit brings a protection against such a situation by slightly
relaxing the test. Instead of checking that there are pending connections
in the backend queue, it also verifies that the backend's connections are
not solely composed of queued connections, which would then indicate we
are in this situation. This is not rocket science, but at least if the
situation happens, we know that it will unlock by itself once the streams
have left, as new requests will be allowed to reach the servers and to
flush the queue again.

This needs to be backported to 2.4 and 2.3.
2021-06-16 09:05:35 +02:00
.github CI: github actions: enable alpine/musl builds 2021-06-12 18:23:22 +02:00
addons BUG/MEDIUM: opentracing: initialization before establishing daemon and/or chroot mode 2021-06-10 06:45:39 +02:00
admin MAJOR: config: remove parsing of the global "nbproc" directive 2021-06-11 17:02:13 +02:00
dev CLEANUP: dev/flags: remove useless test in the stdin number parser 2021-04-03 15:29:10 +02:00
doc DOC: update references to process numbers in cpu-map and bind-process 2021-06-15 16:52:42 +02:00
examples MAJOR: config: remove parsing of the global "nbproc" directive 2021-06-11 17:02:13 +02:00
include CLEANUP: shctx: remove the different inter-process locking techniques 2021-06-15 16:52:42 +02:00
reg-tests REGTESTS: Remove REQUIRE_VERSION=1.7 from all tests 2021-06-11 19:21:28 +02:00
scripts SCRIPTS: opentracing: enable parallel builds in build-ot.sh 2021-06-10 07:35:15 +02:00
src MINOR: backend: only skip LB when there are actual connections 2021-06-16 09:05:35 +02:00
tests MINOR: config: reject long-deprecated "option forceclose" 2021-06-11 16:57:34 +02:00
.cirrus.yml CI: introduce scripts/build-vtest.sh for installing VTest 2021-05-18 10:48:30 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore ADDONS: make addons/ discoverable by git via .gitignore 2021-05-07 16:48:14 +02:00
.travis.yml CI: introduce scripts/build-vtest.sh for installing VTest 2021-05-18 10:48:30 +02:00
BRANCHES DOC: fix some spelling issues over multiple files 2021-01-08 14:53:47 +01:00
CHANGELOG [RELEASE] Released version 2.5-dev0 2021-05-14 09:36:37 +02:00
CONTRIBUTING CLEANUP: contrib: remove the last references to the now dead contrib/ directory 2021-04-21 15:13:58 +02:00
INSTALL CLEANUP: shctx: remove the different inter-process locking techniques 2021-06-15 16:52:42 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS CONTRIB: move spoa_example out of the tree 2021-04-21 09:39:06 +02:00
Makefile CLEANUP: shctx: remove the different inter-process locking techniques 2021-06-15 16:52:42 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
ROADMAP DOC: update the outdated ROADMAP file 2019-06-15 21:59:54 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 2.4.0 2021-05-14 09:03:30 +02:00
VERSION [RELEASE] Released version 2.5-dev0 2021-05-14 09:36:37 +02:00

README 

The HAProxy documentation has been split into a number of different files for
ease of use.

Please refer to the following files depending on what you're looking for :

  - INSTALL for instructions on how to build and install HAProxy
  - BRANCHES to understand the project's life cycle and what version to use
  - LICENSE for the project's license
  - CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory :

  - doc/intro.txt for a quick introduction on HAProxy
  - doc/configuration.txt for the configuration's reference manual
  - doc/lua.txt for the Lua's reference manual
  - doc/SPOE.txt for how to use the SPOE engine
  - doc/network-namespaces.txt for how to use network namespaces under Linux
  - doc/management.txt for the management guide
  - doc/regression-testing.txt for how to use the regression testing suite
  - doc/peers.txt for the peers protocol reference
  - doc/coding-style.txt for how to adopt HAProxy's coding style
  - doc/internals for developer-specific documentation (not all up to date)