huijunwu commented on a change in pull request #2821: Update Dhalion dependency
version
URL: https://github.com/apache/incubator-heron/pull/2821#discussion_r178399304
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File path:
heron/healthmgr/src/java/com/twitter/heron/healthmgr/diagnosers/SlowInstanceDiagnoser.java
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@@ -14,69 +14,74 @@
package com.twitter.heron.healthmgr.diagnosers;
-import java.util.List;
-import java.util.Map;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Collection;
import java.util.logging.Logger;
-import com.microsoft.dhalion.detector.Symptom;
-import com.microsoft.dhalion.diagnoser.Diagnosis;
-import com.microsoft.dhalion.metrics.ComponentMetrics;
-import com.microsoft.dhalion.metrics.InstanceMetrics;
+import com.microsoft.dhalion.core.Diagnosis;
+import com.microsoft.dhalion.core.MeasurementsTable;
+import com.microsoft.dhalion.core.Symptom;
+import com.microsoft.dhalion.core.SymptomsTable;
-import com.twitter.heron.healthmgr.common.ComponentMetricsHelper;
-import com.twitter.heron.healthmgr.common.MetricsStats;
-
-import static
com.twitter.heron.healthmgr.diagnosers.BaseDiagnoser.DiagnosisName.DIAGNOSIS_SLOW_INSTANCE;
-import static
com.twitter.heron.healthmgr.diagnosers.BaseDiagnoser.DiagnosisName.SYMPTOM_SLOW_INSTANCE;
-import static
com.twitter.heron.healthmgr.sensors.BaseSensor.MetricName.METRIC_BACK_PRESSURE;
-import static
com.twitter.heron.healthmgr.sensors.BaseSensor.MetricName.METRIC_BUFFER_SIZE;
+import static
com.twitter.heron.healthmgr.detectors.BaseDetector.SymptomType.SYMPTOM_COMP_BACK_PRESSURE;
+import static
com.twitter.heron.healthmgr.detectors.BaseDetector.SymptomType.SYMPTOM_PROCESSING_RATE_SKEW;
+import static
com.twitter.heron.healthmgr.detectors.BaseDetector.SymptomType.SYMPTOM_WAIT_Q_SIZE_SKEW;
+import static
com.twitter.heron.healthmgr.diagnosers.BaseDiagnoser.DiagnosisType.DIAGNOSIS_SLOW_INSTANCE;
+import static
com.twitter.heron.healthmgr.sensors.BaseSensor.MetricName.METRIC_WAIT_Q_SIZE;
public class SlowInstanceDiagnoser extends BaseDiagnoser {
private static final Logger LOG =
Logger.getLogger(SlowInstanceDiagnoser.class.getName());
@Override
- public Diagnosis diagnose(List<Symptom> symptoms) {
- List<Symptom> bpSymptoms = getBackPressureSymptoms(symptoms);
- Map<String, ComponentMetrics> processingRateSkewComponents =
- getProcessingRateSkewComponents(symptoms);
- Map<String, ComponentMetrics> waitQDisparityComponents =
getWaitQDisparityComponents(symptoms);
+ public Collection<Diagnosis> diagnose(Collection<Symptom> symptoms) {
+ Collection<Diagnosis> diagnoses = new ArrayList<>();
+ SymptomsTable symptomsTable = SymptomsTable.of(symptoms);
- if (bpSymptoms.isEmpty() || waitQDisparityComponents.isEmpty()
- || !processingRateSkewComponents.isEmpty()) {
- // Since there is no back pressure or disparate wait count or similar
- // execution count, no action is needed
- return null;
- } else if (bpSymptoms.size() > 1) {
+ SymptomsTable bp = symptomsTable.type(SYMPTOM_COMP_BACK_PRESSURE.text());
+ if (bp.size() > 1) {
// TODO handle cases where multiple detectors create back pressure
symptom
throw new IllegalStateException("Multiple back-pressure symptoms case");
}
- ComponentMetrics bpMetrics = bpSymptoms.iterator().next().getComponent();
+ if (bp.size() == 0) {
+ return diagnoses;
+ }
+ String bpComponent = bp.first().assignments().iterator().next();
- // verify wait Q disparity and back pressure for the same component exists
- ComponentMetrics pendingBufferMetrics =
waitQDisparityComponents.get(bpMetrics.getName());
- if (pendingBufferMetrics == null) {
- // no wait Q disparity for the component with back pressure. There is no
slow instance
- return null;
+ SymptomsTable processingRateSkew =
symptomsTable.type(SYMPTOM_PROCESSING_RATE_SKEW.text());
+ SymptomsTable waitQSkew =
symptomsTable.type(SYMPTOM_WAIT_Q_SIZE_SKEW.text());
+ // verify wait Q disparity, similar processing rates and back pressure for
the same component
+ // exist
+ if (waitQSkew.assignment(bpComponent).size() == 0
+ || processingRateSkew.assignment(bpComponent).size() > 0) {
+ // TODO in a short window rate skew could exist
+ return diagnoses;
}
- ComponentMetrics mergedData = ComponentMetrics.merge(bpMetrics,
pendingBufferMetrics);
- ComponentMetricsHelper compStats = new ComponentMetricsHelper(mergedData);
- compStats.computeBpStats();
- MetricsStats bufferStats =
compStats.computeMinMaxStats(METRIC_BUFFER_SIZE);
+ Collection<String> assignments = new ArrayList<>();
+
+ Instant newest = context.checkpoint();
+ Instant oldest = context.previousCheckpoint();
+ MeasurementsTable measurements = context.measurements()
+ .between(oldest, newest)
+ .component(bpComponent);
- Symptom resultSymptom = null;
- for (InstanceMetrics boltMetrics : compStats.getBoltsWithBackpressure()) {
- double bufferSize =
boltMetrics.getMetricValueSum(METRIC_BUFFER_SIZE.text());
- double bpValue =
boltMetrics.getMetricValueSum(METRIC_BACK_PRESSURE.text());
- if (bufferStats.getMetricMax() < bufferSize * 2) {
- LOG.info(String.format("SLOW: %s back-pressure(%s) and high buffer
size: %s "
+ for (String instance : measurements.uniqueInstances()) {
+ MeasurementsTable instanceMeasurements = measurements.instance(instance);
+ double waitQSize =
instanceMeasurements.type(METRIC_WAIT_Q_SIZE.text()).mean();
+ if (measurements.type(METRIC_WAIT_Q_SIZE.text()).max() < waitQSize * 2) {
+ assignments.add(instance);
+ LOG.info(String.format("SLOW: %s back-pressure and high buffer size:
%s "
+ "and similar processing rates",
- boltMetrics.getName(), bpValue, bufferSize));
- resultSymptom = new Symptom(SYMPTOM_SLOW_INSTANCE.text(), mergedData);
+ instance, waitQSize));
}
}
- return resultSymptom != null
- ? new Diagnosis(DIAGNOSIS_SLOW_INSTANCE.text(), resultSymptom) : null;
+ Instant now = context.checkpoint();
Review comment:
it can be put inside the below `if`
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