Examples with MeasurementsTable com.microsoft.dhalion.core.MeasurementsTable used on opensource projects

Example 21 with MeasurementsTable

use of com.microsoft.dhalion.core.MeasurementsTable in project heron by twitter.

the class SkewDetector method detect.

/**
 * Detects components experiencing skew on a specific metric
 *
 * @return At most two symptoms corresponding to each affected component -- one for positive skew
 * and one for negative skew
 */
@Override
public Collection<Symptom> detect(Collection<Measurement> measurements) {
    Collection<Symptom> result = new ArrayList<>();
    MeasurementsTable metrics = MeasurementsTable.of(measurements).type(metricName);
    Instant now = context.checkpoint();
    for (String component : metrics.uniqueComponents()) {
        Set<String> addresses = new HashSet<>();
        Set<String> positiveAddresses = new HashSet<>();
        Set<String> negativeAddresses = new HashSet<>();
        double componentMax = getMaxOfAverage(metrics.component(component));
        double componentMin = getMinOfAverage(metrics.component(component));
        if (componentMax > skewRatio * componentMin) {
            // there is skew
            addresses.add(component);
            result.add(new Symptom(symptomType.text(), now, addresses));
            for (String instance : metrics.component(component).uniqueInstances()) {
                if (metrics.instance(instance).mean() >= 0.90 * componentMax) {
                    positiveAddresses.add(instance);
                }
                if (metrics.instance(instance).mean() <= 1.10 * componentMin) {
                    negativeAddresses.add(instance);
                }
            }
            if (!positiveAddresses.isEmpty()) {
                result.add(new Symptom("POSITIVE " + symptomType.text(), now, positiveAddresses));
            }
            if (!negativeAddresses.isEmpty()) {
                result.add(new Symptom("NEGATIVE " + symptomType.text(), now, negativeAddresses));
            }
        }
    }
    return result;
}