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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.autoscale;
import com.yahoo.collections.Pair;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.Map;
import java.util.function.IntFunction;
/**
* A helper for applying load to an application represented by a fixture,
*
* @author bratseth
*/
public class Loader {
private final Fixture fixture;
private final Duration samplingInterval = Duration.ofSeconds(150L);
public Loader(Fixture fixture) {
this.fixture = fixture;
}
/** Assign measured zero traffic in the same way as the system will. */
public Duration zeroTraffic(int measurements, int prodRegions) {
try (var lock = fixture.tester().nodeRepository().applications().lock(fixture.applicationId())) {
var statusWithZeroLoad = fixture.application().status()
.withCurrentReadShare(0)
// the line below from TrafficShareUpdater
.withMaxReadShare(prodRegions < 2 ? 1.0 : 1.0 / ( prodRegions - 1.0));
fixture.tester().nodeRepository().applications().put(fixture.application().with(statusWithZeroLoad), lock);
}
return addQueryRateMeasurements(measurements, (n) -> 0.0);
}
/**
* Adds measurements with the given resource value and ideal values for the other resources,
* scaled to take one node redundancy into account.
* (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
* wanting to see the ideal load with one node missing.)
*
* @param count the number of measurements
*/
public Duration addCpuMeasurements(double value, int count) {
var idealLoad = fixture.clusterModel().idealLoad();
NodeList nodes = fixture.nodes();
float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
Load load = new Load(value, idealLoad.memory(), idealLoad.disk()).multiply(oneExtraNodeFactor);
Instant initialTime = fixture.tester().clock().instant();
for (int i = 0; i < count; i++) {
fixture.tester().clock().advance(samplingInterval);
for (Node node : nodes) {
fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
new NodeMetricSnapshot(fixture.tester().clock().instant(),
load,
0,
true,
true,
0.0))));
}
}
return Duration.between(initialTime, fixture.tester().clock().instant());
}
/** Creates the given number of measurements, spaced 5 minutes between, using the given function */
public Duration addLoadMeasurements(int measurements, IntFunction<Double> queryRate, IntFunction<Double> writeRate) {
Instant initialTime = fixture.tester().clock().instant();
for (int i = 0; i < measurements; i++) {
fixture.tester().nodeMetricsDb().addClusterMetrics(fixture.applicationId(),
Map.of(fixture.clusterId(), new ClusterMetricSnapshot(fixture.tester().clock().instant(),
queryRate.apply(i),
writeRate.apply(i))));
fixture.tester().clock().advance(samplingInterval);
}
return Duration.between(initialTime, fixture.tester().clock().instant());
}
public void applyCpuLoad(double cpuLoad, int measurements) {
addCpuMeasurements((float)cpuLoad, measurements);
fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
addQueryRateMeasurements(measurements, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
}
public void applyMemLoad(double memLoad, int measurements) {
addMemMeasurements(memLoad, measurements);
fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
addQueryRateMeasurements(measurements, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
}
/**
* Adds measurements with the given resource value and ideal values for the other resources,
* scaled to take one node redundancy into account.
* (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
* wanting to see the ideal load with one node missing.)
*/
public void addMemMeasurements(double value, int count) {
var idealLoad = fixture.clusterModel().idealLoad();
NodeList nodes = fixture.nodes();
float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
Load load = new Load(idealLoad.cpu(), value, idealLoad.disk()).multiply(oneExtraNodeFactor);
for (int i = 0; i < count; i++) {
fixture.tester().clock().advance(samplingInterval);
for (Node node : nodes) {
fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
new NodeMetricSnapshot(fixture.tester().clock().instant(),
load,
0,
true,
true,
0.0))));
}
}
}
public Duration addMeasurements(Load load, int count) {
return addMeasurements(load, 0, true, true, count);
}
public Duration addMeasurements(Load load, int generation, boolean inService, boolean stable, int count) {
Instant initialTime = fixture.tester().clock().instant();
for (int i = 0; i < count; i++) {
fixture.tester().clock().advance(samplingInterval);
for (Node node : fixture.nodes()) {
fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
new NodeMetricSnapshot(fixture.tester().clock().instant(),
load,
generation,
inService,
stable,
0.0))));
}
}
return Duration.between(initialTime, fixture.tester().clock().instant());
}
public void applyLoad(Load load, int measurements) {
addMeasurements(load, measurements);
fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
addQueryRateMeasurements(measurements, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
}
public void applyLoad(Load load, int generation, boolean inService, boolean stable, int measurements) {
addMeasurements(load, generation, inService, stable, measurements);
fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
addQueryRateMeasurements(measurements, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
}
public Duration addQueryRateMeasurements(int measurements, IntFunction<Double> queryRate) {
Instant initialTime = fixture.tester().clock().instant();
for (int i = 0; i < measurements; i++) {
fixture.tester().nodeMetricsDb().addClusterMetrics(fixture.applicationId(),
Map.of(fixture.clusterId(), new ClusterMetricSnapshot(fixture.tester().clock().instant(),
queryRate.apply(i),
0.0)));
fixture.tester().clock().advance(samplingInterval);
}
return Duration.between(initialTime, fixture.tester().clock().instant());
}
}
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