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82c9789ac4
We were not checking p->feconn nor the global actconn soon enough. In older versions this could result in a frontend accepting more connections than allowed by its maxconn or the global maxconn, exactly N-1 extra connections where N is the number of threads, provided each of these threads were running a different listener. But with the lock removal, it became worse, the excess could be the listener's maxconn multiplied by the number of threads. Among the nasty side effect was that LI_FULL could be removed while the limit was still over and in some cases the polling on the socket was no re-enabled. This commit takes care of updating and checking p->feconn and the global actconn *before* processing the connection, so that the listener can be turned off before accepting the socket if needed. This requires to move some of the bookkeeping operations form session to listen, which totally makes sense in this context. Now the limits are properly respected, even if a listener's maxconn is over a frontend's. This only applies on top of the listener lock removal series and doesn't have to be backported. |
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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 - 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)