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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 java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import static com.yahoo.vespa.hosted.provision.autoscale.ClusterModel.warmupDuration;
/**
* A list of metric snapshots from a node, sorted by increasing time (newest last).
*
* @author bratseth
*/
public class NodeTimeseries {
private final String hostname;
private final List<NodeMetricSnapshot> snapshots;
NodeTimeseries(String hostname, List<NodeMetricSnapshot> snapshots) {
this.hostname = hostname;
List<NodeMetricSnapshot> sortedSnapshots = new ArrayList<>(snapshots);
Collections.sort(sortedSnapshots);
this.snapshots = Collections.unmodifiableList(sortedSnapshots);
}
public boolean isEmpty() { return snapshots.isEmpty(); }
public int size() { return snapshots.size(); }
public NodeMetricSnapshot get(int index) { return snapshots.get(index); }
/** Returns the last (newest) snapshot in this, or empty if there are none. */
public Optional<NodeMetricSnapshot> last() {
if (snapshots.isEmpty()) return Optional.empty();
return Optional.of(snapshots.get(snapshots.size() - 1));
}
public List<NodeMetricSnapshot> asList() { return snapshots; }
public String hostname() { return hostname; }
public NodeTimeseries add(NodeMetricSnapshot snapshot) {
List<NodeMetricSnapshot> list = new ArrayList<>(snapshots);
list.add(snapshot);
return new NodeTimeseries(hostname(), list);
}
/** Returns the instant this changed to the given generation, or empty if no *change* to this generation is present */
private Optional<Instant> generationChange(long targetGeneration) {
if (snapshots.isEmpty()) return Optional.empty();
if (snapshots.get(0).generation() == targetGeneration) return Optional.of(snapshots.get(0).at());
for (NodeMetricSnapshot snapshot : snapshots) {
if (snapshot.generation() == targetGeneration)
return Optional.of(snapshot.at());
}
return Optional.empty();
}
public NodeTimeseries keep(Predicate<NodeMetricSnapshot> filter) {
return new NodeTimeseries(hostname, snapshots.stream()
.filter(snapshot -> filter.test(snapshot))
.collect(Collectors.toList()));
}
public NodeTimeseries keepAfter(Instant oldestTime) {
return new NodeTimeseries(hostname,
snapshots.stream()
.filter(snapshot -> snapshot.at().equals(oldestTime) || snapshot.at().isAfter(oldestTime))
.collect(Collectors.toList()));
}
public NodeTimeseries keepCurrentGenerationAfterWarmup(long currentGeneration) {
Optional<Instant> generationChange = generationChange(currentGeneration);
return keep(snapshot -> isOnCurrentGenerationAfterWarmup(snapshot, currentGeneration, generationChange));
}
private boolean isOnCurrentGenerationAfterWarmup(NodeMetricSnapshot snapshot,
long currentGeneration,
Optional<Instant> generationChange) {
if (snapshot.generation() < 0) return true; // Content nodes do not yet send generation
if (snapshot.generation() < currentGeneration) return false;
if (generationChange.isEmpty()) return true;
return ! snapshot.at().isBefore(generationChange.get().plus(warmupDuration.multipliedBy(2)));
}
}
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