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When trying to reuse a backend connection, a connection hash is calculated to match an entry with similar parameters. Previously, this operation was skipped if the stream content wasn't based on HTTP, as it would have been incompatible with http-reuse. With the introduction of SPOP backends, this condition was removed, so that it can also benefit from connection reuse. However, this means that now hash calcul is always performed when connecting to a server, even for TCP or log backends. This is unnecessary as these proxies cannot perform connection reuse. Note also that reuse mode is resetted on postparsing for incompatible backends. This at least guarantees that no tree lookup will be performed via be_reuse_connection(). However, connection lookup is still performed in the session via session_get_conn() which is another unnecessary operation. Thus, this patch restores the condition so that reuse operations are now entirely skipped if a backend mode is incompatible. This is implemented via a new utility function named be_supports_conn_reuse(). This could be backported up to 3.1, as this commit could be considered as a performance regression for tcp/log backend modes.
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.