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The Profiler

We can set up the profiler to track the MAD statistical state required to compute MAD. For the purposes of this demonstration, we will configure the profiler to capture statistics on the minute mark. We will capture a global statistical state for the value field and we will look back for a 5 minute window when computing the median.

Create the following file at $METRON_HOME/config/zookeeper/profiler.json:

  "profiles": [
      "profile": "sketchy_mad",
      "foreach": "'global'",
      "onlyif": "true",
      "init" : {
        "s": "OUTLIER_MAD_STATE_MERGE(PROFILE_GET('sketchy_mad',
'global', PROFILE_FIXED(5, 'MINUTES')))"
      "update": {
        "s": "OUTLIER_MAD_ADD(s, value)"
      "result": "s"

Adjust $METRON_HOME/config/zookeeper/global.json to adjust the capture duration:

 "profiler.client.period.duration" : "1",
 "profiler.client.period.duration.units" : "MINUTES"

Adjust $METRON_HOME/config/ to adjust the capture duration by changing profiler.period.duration=15to profiler.period.duration=1