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When a process with large stick tables is replaced by a new one and remains present until the last connection finishes, it keeps these data in memory for nothing since they will never be used anymore by incoming connections, except during syncing with the new process. This is especially problematic when dealing with long session protocols such as WebSocket as it becomes possible to stack many processes and eat a lot of memory. So the idea here is to know if a table still needs to be synced or not, and to purge all unused entries once the sync is complete. This means that after a few hundred milliseconds when everything has been synchronized with the new process, only a few entries will remain allocated (only the ones held by sessions during the restart) and all the remaining memory will be freed. Note that we carefully do that only after the grace period is expired so as not to impact a possible proxy that needs to accept a few more connections before leaving. Doing this required to add a sync counter to the stick tables, to know how many peer sync sessions are still in progress in order not to flush the entries until all synchronizations are completed. |
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| .. | ||
| acl.h | ||
| arg.h | ||
| auth.h | ||
| backend.h | ||
| channel.h | ||
| checks.h | ||
| compression.h | ||
| connection.h | ||
| cttproxy.h | ||
| dumpstats.h | ||
| fd.h | ||
| freq_ctr.h | ||
| frontend.h | ||
| hdr_idx.h | ||
| lb_chash.h | ||
| lb_fas.h | ||
| lb_fwlc.h | ||
| lb_fwrr.h | ||
| lb_map.h | ||
| listener.h | ||
| log.h | ||
| obj_type.h | ||
| payload.h | ||
| peers.h | ||
| pipe.h | ||
| port_range.h | ||
| proto_http.h | ||
| proto_tcp.h | ||
| proto_uxst.h | ||
| protocol.h | ||
| proxy.h | ||
| queue.h | ||
| raw_sock.h | ||
| sample.h | ||
| server.h | ||
| session.h | ||
| shctx.h | ||
| signal.h | ||
| ssl_sock.h | ||
| stick_table.h | ||
| stream_interface.h | ||
| task.h | ||
| template.h | ||