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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.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.applications.Cluster;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import static com.yahoo.vespa.hosted.provision.autoscale.ClusterModel.warmupDuration;
/**
* A series of metric snapshots for the nodes of a cluster used to compute load
*
* @author bratseth
*/
public class ClusterNodesTimeseries {
private final NodeList clusterNodes;
/** The measurements for all nodes in this snapshot */
private final List<NodeTimeseries> timeseries;
public ClusterNodesTimeseries(Duration period, Cluster cluster, NodeList clusterNodes, MetricsDb db) {
this.clusterNodes = clusterNodes;
// See warmupSeconds*4 into the past to see any generation change in it
// If none can be detected we assume the node is new/was down.
// If either this is the case, or there is a generation change, we ignore
// the first warmupWindow metrics
var timeseries = db.getNodeTimeseries(period.plus(warmupDuration.multipliedBy(4)), clusterNodes);
if (cluster.lastScalingEvent().isPresent()) {
long currentGeneration = cluster.lastScalingEvent().get().generation();
timeseries = keepCurrentGenerationAfterWarmup(timeseries, currentGeneration);
}
timeseries = keep(timeseries, snapshot -> snapshot.inService() && snapshot.stable());
timeseries = keep(timeseries, snapshot -> ! snapshot.at().isBefore(db.clock().instant().minus(period)));
this.timeseries = timeseries;
}
private ClusterNodesTimeseries(NodeList clusterNodes, List<NodeTimeseries> timeseries) {
this.clusterNodes = clusterNodes;
this.timeseries = timeseries;
}
/** Returns the average number of measurements per node */
public int measurementsPerNode() {
int measurementCount = timeseries.stream().mapToInt(m -> m.size()).sum();
return measurementCount / clusterNodes.size();
}
/** Returns the number of nodes measured in this */
public int nodesMeasured() { return timeseries.size(); }
/** Returns the average load after the given instant */
public Load averageLoad(Instant start) {
Load total = Load.zero();
int count = 0;
for (var nodeTimeseries : timeseries) {
for (var snapshot : nodeTimeseries.asList()) {
if (snapshot.at().isBefore(start)) continue;
total = total.add(snapshot.load());
count++;
}
}
return total.divide(count);
}
private static List<NodeTimeseries> keep(List<NodeTimeseries> timeseries, Predicate<NodeMetricSnapshot> filter) {
return timeseries.stream().map(nodeTimeseries -> nodeTimeseries.keep(filter)).collect(Collectors.toList());
}
private static List<NodeTimeseries> keepCurrentGenerationAfterWarmup(List<NodeTimeseries> timeseries,
long currentGeneration) {
return timeseries.stream()
.map(nodeTimeseries -> nodeTimeseries.keepCurrentGenerationAfterWarmup(currentGeneration))
.collect(Collectors.toList());
}
public static ClusterNodesTimeseries empty() {
return new ClusterNodesTimeseries(NodeList.of(), List.of());
}
}
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