cda7275ef5
There is a small race condition, where a server would check if there is something left in the proxy queue, and adding something to the proxy queue. If the server checks just before the stream is added to the queue, and it no longer has any stream to deal with, then nothing will take care of the stream, that may stay in the queue forever. This was worked around with commit 5541d4995d, by checking for that exact condition after adding the stream to the queue, and trying again to get a server assigned if it is detected. That fix lead to multiple infinite loops, that got fixed, but it is not unlikely that it could happen again. So let's fix the initial problem differently : a single server may mark itself as ready, and it removes itself once used. The principle is that when we discover that the just queued stream is alone with no active request anywhere ot dequeue it, instead of rebalancing it, it will be assigned to that current "ready" server that is available to handle it. The extra cost of the atomic ops is negligible since the situation is super rare.
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.