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b304dc7fd7
When one server appears at the same position in multiple backends, it receives all the checks from all the backends exactly at the same time because the health-checks are only spread within a backend but not globally. Attached patch implements per-server start delay in a different way. Checks are now spread globally - not locally to one backend. It also makes them start faster - IMHO there is no need to add a 'server->inter' when calculating first execution. Calculation were moved from cfgparse.c to checks.c. There is a new function start_checks() and now it is not called when haproxy is started in MODE_CHECK. With this patch it is also possible to set a global 'spread-checks' parameter. It takes a percentage value (1..50, probably something near 5..10 is a good idea) so haproxy adds or removes that many percent to the original interval after each check. My test shows that with 18 backends, 54 servers total and 10000ms/5% it takes about 45m to mix them completely. I decided to use rand/srand pseudo-random number generator. I am aware it is not recommend for a good randomness but a) we do not need a good random generator here b) it is probably the most portable one. |
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