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HAProxy - Load balancer
d1d005d7f6
As reported in issue #419, a "clear map" operation on a very large map can take a lot of time and freeze the entire process for several seconds. This patch makes sure that pat_ref_prune() can regularly yield after clearing some entries so that the rest of the process continues to work. The first part, the removal of the patterns, can take quite some time by itself in one run but it's still relatively fast. It may block for up to 100ms for 16M IP addresses in a tree typically. This change needed to declare an I/O handler for the clear operation so that we can get back to it after yielding. The second part can be much slower because it deconstructs the elements and its users, but it iterates progressively so we can yield less often here. The patch was tested with traffic in parallel sollicitating the map being released and showed no problem. Some traffic will definitely notice an incomplete map but the filling is already not atomic anyway thus this is not different. It may be backported to stable versions once sufficiently tested for side effects, at least as far as 2.0 in order to avoid the watchdog triggering when the process is frozen there. For a better behaviour, all these prune_* functions should support yielding so that the callers have a chance to continue also yield in turn. |
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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)