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Qserv stability has been dramatically improved. We demonstrated we can run Qserv under heavy load with no problems, no crashes and no memory leaks for extended periods of times (e.g. ~48 hours, we did not try longer). During the tests we continuously run ran over large number of queries (over 100 simultaneous queries at any given time, with peaks above 200). We tested the limits, and uncovered one limitation which will be addressed during S16 cycle (returning very large results from a query results in overly high CPU and memory consumption)
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