8da6ed6b6a
In 3.2, the table expiration latency was improved by commit 994cc58576
("MEDIUM: stick-tables: Limit the number of entries we expire"), however
it introduced an issue by which it's possible to leave the loop after a
certain number of elements were expired, without requeuing the deleted
elements. The issue it causes is that other places with a non-null ref_cnt
will not necessarily delete it themselves, resulting in orphan elements in
the table. These ones will then pollute it and force recycling old ones
more often which in turn results in an increase of the contention.
Let's check for the expiration counter before deleting the element so
that it can be found upon next visit.
This fix must be backported to 3.2. It is directly related to GH
issue #3084. Thanks to Felipe and Ricardo for sharing precious info
and testing a candidate fix.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.