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a8a3d95be5
Use timer (configurable as 'gc period') to schedule routing table GC/pruning to ensure that prune is done on time but not too often. Randomize GC timers to avoid concentration of GC events from different tables in one loop cycle. Fix a bug that caused minimum inter-GC interval be 5 us instead of 5 s. Make default 'gc period' adaptive based on number of routing tables, from 10 s for small setups to 600 s for large ones. In marge multi-table RS setup, the patch improved time of flushing a downed peer from 20-30 min to <2 min and removed 40s latencies.