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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.node;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.util.set.Sets;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.xcontent.ToXContentFragment;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
/**
* Class representing statistics about adaptive replica selection. This includes
* EWMA of queue size, service time, and response time, as well as outgoing
* searches to each node and the "rank" based on the ARS formula.
*/
public class AdaptiveSelectionStats implements Writeable, ToXContentFragment {
private final Map clientOutgoingConnections;
private final Map nodeComputedStats;
public AdaptiveSelectionStats(
Map clientConnections,
Map nodeComputedStats
) {
this.clientOutgoingConnections = clientConnections;
this.nodeComputedStats = nodeComputedStats;
}
public AdaptiveSelectionStats(StreamInput in) throws IOException {
this.clientOutgoingConnections = in.readMap(StreamInput::readString, StreamInput::readLong);
this.nodeComputedStats = in.readMap(StreamInput::readString, ResponseCollectorService.ComputedNodeStats::new);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeMap(this.clientOutgoingConnections, StreamOutput::writeString, StreamOutput::writeLong);
out.writeMap(this.nodeComputedStats, StreamOutput::writeString, (stream, stats) -> stats.writeTo(stream));
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject("adaptive_selection");
Set allNodeIds = Sets.union(clientOutgoingConnections.keySet(), nodeComputedStats.keySet());
for (String nodeId : allNodeIds) {
builder.startObject(nodeId);
ResponseCollectorService.ComputedNodeStats stats = nodeComputedStats.get(nodeId);
if (stats != null) {
long outgoingSearches = clientOutgoingConnections.getOrDefault(nodeId, 0L);
builder.field("outgoing_searches", outgoingSearches);
builder.field("avg_queue_size", stats.queueSize);
if (builder.humanReadable()) {
builder.field("avg_service_time", new TimeValue((long) stats.serviceTime, TimeUnit.NANOSECONDS).toString());
}
builder.field("avg_service_time_ns", (long) stats.serviceTime);
if (builder.humanReadable()) {
builder.field("avg_response_time", new TimeValue((long) stats.responseTime, TimeUnit.NANOSECONDS).toString());
}
builder.field("avg_response_time_ns", (long) stats.responseTime);
builder.field("rank", String.format(Locale.ROOT, "%.1f", stats.rank(outgoingSearches)));
}
builder.endObject();
}
builder.endObject();
return builder;
}
/**
* Returns a map of node id to the outgoing search requests to that node
*/
public Map getOutgoingConnections() {
return clientOutgoingConnections;
}
/**
* Returns a map of node id to the computed stats
*/
public Map getComputedStats() {
return nodeComputedStats;
}
/**
* Returns a map of node id to the ranking of the nodes based on the adaptive replica formula
*/
public Map getRanks() {
return nodeComputedStats.entrySet()
.stream()
.collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue().rank(clientOutgoingConnections.getOrDefault(e.getKey(), 0L))));
}
}