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This test was already performed when a new message is queued into the
sending queue. However not when the last applet is released, in
spoe_release_appctx(). It is a quite old bug. It was introduced by commit
6f1296b5c7 ("BUG/MEDIUM: spoe: Create a SPOE applet if necessary when the
last one is released").
Because of this bug, new SPOE applets may be created and quickly released
because there is no server up, in loop and while there is at least one
message in the sending queue, consuming all the CPU. It is pretty visible if
the processing timeout is high.
To fix the bug, conditions to create or not a SPOE applet are now
centralized in spoe_create_appctx(). The test about the max connections per
second and about number of active servers are moved in this function.
This patch must be backported to all stable versions.
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)