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This patch implements peer heartbeat feature to prevent any haproxy peer from reconnecting too often, consuming sockets for nothing. To do so, we add PEER_MSG_CTRL_HEARTBEAT new message to PEER_MSG_CLASS_CONTROL peers control class of messages. A ->heartbeat field is added to peer structs to store the heatbeat timeout value which is handled by the same function as for ->reconnect to control the session timeouts. A 2-bytes heartbeat message is sent every 3s when no updates have to be sent. This way, the peer which receives such a message is sure the remote peer is still alive. So, it resets the ->reconnect peer session timeout to its initial value (5s). This prevents any reconnection to an already connected alive peer. |
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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)