ad98edd00a
Since commit beb859abce ("MINOR: polling: add an option to support
busy polling") the time and status passed to clock_update_local_date()
were incorrect. Indeed, what is considered is the before_poll date
related to the configured timeout which does not correspond to what
is passed to the poller. That's not correct because before_poll+the
syscall's timeout will be crossed by the current date 100 ms after
the start of the poller. In practice it didn't happen when the poller
was limited to 1s timeout but at one minute it happens all the time.
That's particularly visible when running a multi-threaded setup with
busy polling and only half of the threads working (bind ... thread even).
In this case, the fixup code of clock_update_local_date() is executed
for each round of busy polling. The issue was made really visible
starting with recent commit e8b1ad4c2b ("BUG/MEDIUM: clock: also
update the date offset on time jumps") because upon a jump, the
shared offset is reset, while it should not be in this specific
case.
What needs to be done instead is to pass the configured timeout of
the poller (and not of the syscall), and always pass "interrupted"
set so as to claim we got an event (which is sort of true as it just
means the poller returned instantly). In this case we can still
detect backwards/forward jumps and will use a correct boundary
for the maximum date that covers the whole loop.
This can be backported to all versions since the issue was introduced
with busy-polling in 1.9-dev8.
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.