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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.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* An in-memory implementation of the metrics Db.
* Thread model: One writer, many readers.
*
* @author bratseth
*/
public class MemoryMetricsDb implements MetricsDb {
private final Clock clock;
/** Metric time series by node (hostname). Each list of metric snapshots is sorted by increasing timestamp */
private final Map<String, NodeTimeseries> nodeTimeseries = new HashMap<>();
private final Map<Pair<ApplicationId, ClusterSpec.Id>, ClusterTimeseries> clusterTimeseries = new HashMap<>();
/** Lock all access for now since we modify lists inside a map */
private final Object lock = new Object();
public MemoryMetricsDb(Clock clock) {
this.clock = clock;
}
@Override
public Clock clock() { return clock; }
@Override
public void addNodeMetrics(Collection<Pair<String, NodeMetricSnapshot>> nodeMetrics) {
synchronized (lock) {
for (var value : nodeMetrics) {
add(value.getFirst(), value.getSecond());
}
}
}
@Override
public void addClusterMetrics(ApplicationId application, Map<ClusterSpec.Id, ClusterMetricSnapshot> clusterMetrics) {
synchronized (lock) {
for (var value : clusterMetrics.entrySet()) {
add(application, value.getKey(), value.getValue());
}
}
}
public void clearClusterMetrics(ApplicationId application, ClusterSpec.Id cluster) {
synchronized (lock) {
clusterTimeseries.remove(new Pair<>(application, cluster));
}
}
@Override
public List<NodeTimeseries> getNodeTimeseries(Duration period, Set<String> hostnames) {
Instant startTime = clock().instant().minus(period);
synchronized (lock) {
if (hostnames.isEmpty())
return nodeTimeseries.values().stream().map(ns -> ns.keepAfter(startTime)).toList();
else
return hostnames.stream()
.map(hostname -> nodeTimeseries.getOrDefault(hostname, new NodeTimeseries(hostname, List.of())).keepAfter(startTime))
.toList();
}
}
@Override
public ClusterTimeseries getClusterTimeseries(ApplicationId application, ClusterSpec.Id cluster) {
return clusterTimeseries.computeIfAbsent(new Pair<>(application, cluster),
__ -> new ClusterTimeseries(cluster, new ArrayList<>()));
}
@Override
public void gc() {
synchronized (lock) {
// Each measurement is Object + long + float = 16 + 8 + 4 = 28 bytes
// 12 hours with 1k nodes and 3 resources and 1 measurement/sec is about 5Gb
for (String hostname : nodeTimeseries.keySet()) {
var timeseries = nodeTimeseries.get(hostname);
timeseries = timeseries.keepAfter(clock().instant().minus(Autoscaler.maxScalingWindow()));
if (timeseries.isEmpty())
nodeTimeseries.remove(hostname);
else
nodeTimeseries.put(hostname, timeseries);
}
}
}
@Override
public void close() {}
private void add(String hostname, NodeMetricSnapshot snapshot) {
NodeTimeseries timeseries = nodeTimeseries.get(hostname);
if (timeseries == null) { // new node
timeseries = new NodeTimeseries(hostname, new ArrayList<>());
nodeTimeseries.put(hostname, timeseries);
}
nodeTimeseries.put(hostname, timeseries.add(snapshot));
}
private void add(ApplicationId application, ClusterSpec.Id cluster, ClusterMetricSnapshot snapshot) {
var key = new Pair<>(application, cluster);
var existing = clusterTimeseries.computeIfAbsent(key, __ -> new ClusterTimeseries(cluster, new ArrayList<>()));
clusterTimeseries.put(key, existing.add(snapshot));
}
}
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