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From Donald Smith <Donald.Sm...@audiencescience.com>
Subject How often are JMX Cassandra metrics reset?
Date Wed, 27 Aug 2014 19:38:15 GMT
I'm using JMX to retrieve Cassandra metrics.   I notice that  Max and Count are cumulative
and aren't reset.    How often are the stats for Mean, 99tthPercentile, etc reset back to
zero?

For example, 99thPercentile shows as 1.5 mls. Over how many minutes?

ClientRequest/Read/Latency:
    LatencyUnit = MICROSECONDS
    FiveMinuteRate = 1.12
    FifteenMinuteRate = 1.11
    RateUnit = SECONDS
    MeanRate = 1.65
    OneMinuteRate = 1.13
    EventType = calls
   Max = 237,373.37
    Count = 961,312
    50thPercentile = 383.2
    Mean = 908.46
    Min = 95.64
    StdDev = 3,034.62
    75thPercentile = 626.34
    95thPercentile = 954.31
    98thPercentile = 1,443.11
    99thPercentile = 1,472.4
    999thPercentile = 1,858.1

Donald A. Smith | Senior Software Engineer
P: 425.201.3900 x 3866
C: (206) 819-5965
F: (646) 443-2333
donalds@AudienceScience.com<mailto:donalds@AudienceScience.com>

[AudienceScience]


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