jhuan31 commented on issue #781: ZOOKEEPER-3251: Add new server metric types: percentile counter and c… URL: https://github.com/apache/zookeeper/pull/781#issuecomment-459414315 @anmolnar Sorry about the late reply. The reservoir is used to hold samples of data points that are used to compute the percentiles. A random number generator is used to make the probability of an incoming data point being picked equal (uniform). Newer data points weigh the same as older data points.
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