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When peers are configured and HAProxy is reloaded or restarted, a synchronization is performed between the old process and the new one. To do so, the old process connects on the new one. If the synchronization fails, it retries. However, there is no delay and reconnect attempts are not bounded. Thus, it may loop for a while, consuming all the CPU. Of course, it is unexpected, but it is possible. For instance, if the local peer is misconfigured, an infinite loop can be observed if the connection succeeds but not the synchronization. This prevents the old process to exit, except if "hard-stop-after" option is set. To fix the bug, the reconnect is delayed. The local peer already has a expiration date to delay the reconnects. But it was not used on stopping mode. So we use it not. Thanks to the previous fix, the reconnect timeout is shorter in this case (500ms against 5s on running mode). In addition, we also use the peers resync expiration date to not infinitely retries. It is accurate because the new process, on its side, use this timeout to switch from a local resync to a remote resync. This patch depends on "MINOR: peers: Use a dedicated reconnect timeout when stopping the local peer". It fixes the issue #1799. It should be backported as far as 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)