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In issue #933, @jaroslawr provided a report indicating that when using many threads and many servers, it's very difficult to terminate the last idle connections on each server. The issue has two causes in fact. The first one is that during the calculation of the estimate of needed connections, we round the computation up while in previous round it was already rounded up, so we end up adding 1 to 1 which once divided by 2 remains 1. The second issue is that servers are not woken up anymore for purging their connections if they don't have activity. The only reason that was there to wake them up again was in case insufficient connections were purged. And even then the purge task itself was not woken up. But that is not enough for getting rid of the long tail of old connections nor updating est_need_conns. This patch makes sure to properly wake up as long as at least one idle connection remains, and not to round up the needed connections anymore. Prior to this patch, a test involving many connections which suddenly stopped would keep many idle connections, now they're effectively halved every pool-purge-delay. This needs to be backported to 2.2.
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)