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Return to just using counters instead of timers for measuring experiment outcomes.

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This commit is contained in:
Jon Chambers
2020-06-17 14:41:42 -04:00
committed by Jon Chambers
parent 4c1844e46a
commit 6adcebb247
2 changed files with 52 additions and 78 deletions
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83
service/src/main/java/org/whispersystems/textsecuregcm/experiment/Experiment.java
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@@ -1,26 +1,26 @@
package org.whispersystems.textsecuregcm.experiment;
import com.codahale.metrics.MetricRegistry;
import com.google.common.annotations.VisibleForTesting;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.Timer;
import java.util.Objects;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import static com.codahale.metrics.MetricRegistry.name;
/**
* An experiment compares the results of two operations and records metrics to assess how frequently they match.
*/
public class Experiment {
private final Timer matchTimer;
private final Timer errorTimer;
private final Counter matchCounter;
private final Counter errorCounter;
private final Timer bothPresentMismatchTimer;
private final Timer controlNullMismatchTimer;
private final Timer experimentNullMismatchTimer;
private final Counter bothPresentMismatchCounter;
private final Counter controlNullMismatchCounter;
private final Counter experimentNullMismatchCounter;
private static final String OUTCOME_TAG = "outcome";
private static final String MATCH_OUTCOME = "match";
@@ -33,77 +33,54 @@ public class Experiment {
private static final String EXPERIMENT_NULL_MISMATCH = "experimentResultNull";
public Experiment(final String... names) {
this(buildTimer(MATCH_OUTCOME, names).register(Metrics.globalRegistry),
buildTimer(ERROR_OUTCOME, names).register(Metrics.globalRegistry),
buildTimer(MISMATCH_OUTCOME, names).tag(MISMATCH_TYPE_TAG, BOTH_PRESENT_MISMATCH).register(Metrics.globalRegistry),
buildTimer(MISMATCH_OUTCOME, names).tag(MISMATCH_TYPE_TAG, CONTROL_NULL_MISMATCH).register(Metrics.globalRegistry),
buildTimer(MISMATCH_OUTCOME, names).tag(MISMATCH_TYPE_TAG, EXPERIMENT_NULL_MISMATCH).register(Metrics.globalRegistry));
}
private static Timer.Builder buildTimer(final String outcome, final String... names) {
if (names == null || names.length == 0) {
throw new IllegalArgumentException("Experiments must have a name");
}
return Timer.builder(MetricRegistry.name(Experiment.class, names))
.tag(OUTCOME_TAG, outcome)
.publishPercentileHistogram();
this(Metrics.counter(name(Experiment.class, names), OUTCOME_TAG, MATCH_OUTCOME),
Metrics.counter(name(Experiment.class, names), OUTCOME_TAG, ERROR_OUTCOME),
Metrics.counter(name(Experiment.class, names), OUTCOME_TAG, MISMATCH_OUTCOME, MISMATCH_TYPE_TAG, BOTH_PRESENT_MISMATCH),
Metrics.counter(name(Experiment.class, names), OUTCOME_TAG, MISMATCH_OUTCOME, MISMATCH_TYPE_TAG, CONTROL_NULL_MISMATCH),
Metrics.counter(name(Experiment.class, names), OUTCOME_TAG, MISMATCH_OUTCOME, MISMATCH_TYPE_TAG, EXPERIMENT_NULL_MISMATCH));
}
@VisibleForTesting
Experiment(final Timer matchTimer, final Timer errorTimer, final Timer bothPresentMismatchTimer, final Timer controlNullMismatchTimer, final Timer experimentNullMismatchTimer) {
this.matchTimer = matchTimer;
this.errorTimer = errorTimer;
Experiment(final Counter matchCounter, final Counter errorCounter, final Counter bothPresentMismatchCounter, final Counter controlNullMismatchCounter, final Counter experimentNullMismatchCounter) {
this.matchCounter = matchCounter;
this.errorCounter = errorCounter;
this.bothPresentMismatchTimer = bothPresentMismatchTimer;
this.controlNullMismatchTimer = controlNullMismatchTimer;
this.experimentNullMismatchTimer = experimentNullMismatchTimer;
this.bothPresentMismatchCounter = bothPresentMismatchCounter;
this.controlNullMismatchCounter = controlNullMismatchCounter;
this.experimentNullMismatchCounter = experimentNullMismatchCounter;
}
public <T> void compareFutureResult(final T expected, final CompletionStage<T> experimentStage) {
// We're assuming that we get the experiment completion stage as soon as possible after it's started, but this
// start time will inescapably have some "wiggle" to it.
final long start = System.nanoTime();
experimentStage.whenComplete((actual, cause) -> {
final long duration = System.nanoTime() - start;
if (cause != null) {
recordError(duration);
errorCounter.increment();
} else {
recordResult(duration, expected, actual);
recordResult(expected, actual);
}
});
}
public <T> void compareSupplierResult(final T expected, final Supplier<T> experimentSupplier) {
final long start = System.nanoTime();
try {
final T result = experimentSupplier.get();
recordResult(System.nanoTime() - start, expected, result);
recordResult(expected, experimentSupplier.get());
} catch (final Exception e) {
recordError(System.nanoTime() - start);
errorCounter.increment();
}
}
private void recordError(final long durationNanos) {
errorTimer.record(durationNanos, TimeUnit.NANOSECONDS);
}
private <T> void recordResult(final long durationNanos, final T expected, final T actual) {
final Timer timer;
private <T> void recordResult(final T expected, final T actual) {
final Counter counter;
if (Objects.equals(expected, actual)) {
timer = matchTimer;
counter = matchCounter;
} else if (expected == null) {
timer = controlNullMismatchTimer;
counter = controlNullMismatchCounter;
} else if (actual == null) {
timer = experimentNullMismatchTimer;
counter = experimentNullMismatchCounter;
} else {
timer = bothPresentMismatchTimer;
counter = bothPresentMismatchCounter;
}
timer.record(durationNanos, TimeUnit.NANOSECONDS);
counter.increment();
}
}