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In issue #277 is reported a strange problem related to a fast-spinning applet which seems to show valid progress being made. It's uncertain how this can happen, maybe some very specific timing patterns manage to place just a few bytes in each buffer and result in the peers applet being called a lot. But it appears possible to artificially cross the spinning threshold by asking for monster stats page (500 MB) and limiting the send() size to 1 MSS (1460 bytes), causing the stats page to be called for very small blocks which most often do not leave enough room to place a new chunk. The idea developed in this patch consists in not crashing for an applet which reaches a very high call rate if it shows some indication of progress. Detecting progress on applets is not trivial but in our case we know that they must at least not claim to wait for a buffer allocation if this buffer is present, wait for room if the buffer is empty, ask for more data without polling if such data are still present, nor leave with an empty input buffer without having written anything nor read anything from the other side while a shutw is pending. Doing so doesn't affect normal behaviors nor abuses of our existing applets and does at least protect against an applet performing an early return without processing events, or one causing an endless loop by asking for impossible conditions. This must be backported to 2.0.
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)