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When a tarpit action is performed, we must be sure to drain data from the request channel. Otherwise, the mux on the frontend side may be blocked because the request channel buffer is full. This may lead to Two bugs. The first one is a HOL blocking on the H2 multiplexer. A tarpitted stream may block all the others because data are not drained for the whole tarpit timeout. The second bug is a ping-pong loop between the multiplexer and the stream. The mux is waiting for more space in the channel buffer, so it wakes up the stream. And the stream systematically re-enables receives. This last part is not pretty clean and it will be addressed with another fix. But draning request data is a good way to fix both bugs in same time. This patch must be backported as far as 2.0. The legacy HTTP mode is probably affected, but I don't know if same bugs may be experienced in this mode.
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)