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As seen in GH issue #1770, peers synchronization do not cope well with very large buffers because by default the only two reasons for stopping the processing of updates is either that the end was reached or that the buffer is full. This can cause high latencies, and even rightfully trigger the watchdog when the operations are numerous and slowed down by competition on the stick-table lock. This patch introduces a limit to the number of messages one may send at once, which now defaults to 200, regardless of the buffer size. This means taking and releasing the lock up to 400 times in a row, which is costly enough to let some other parts work. After some observation this could be backported to 2.6. If so, however, previous commits "BUG/MEDIUM: applet: fix incorrect check for abnormal return condition from handler" and "BUG/MINOR: applet: make the call_rate only count the no-progress calls" must be backported otherwise the call rate might trigger the looping protection. |
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| INSTALL | ||
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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 - 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)