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// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.http.application;
import ai.vespa.metricsproxy.metric.model.ConsumerId;
import ai.vespa.metricsproxy.metric.model.MetricsPacket;
import ai.vespa.util.http.hc5.VespaHttpClientBuilder;
import com.google.inject.Inject;
import com.yahoo.component.AbstractComponent;
import com.yahoo.concurrent.ThreadFactoryFactory;
import org.apache.hc.client5.http.classic.HttpClient;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.core5.util.Timeout;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.logging.Level;
import java.time.Clock;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import static ai.vespa.metricsproxy.http.ValuesFetcher.defaultMetricsConsumerId;
/**
* This class retrieves metrics from all nodes in the given config, usually all
* nodes in a Vespa application.
*
* @author gjoranv
*/
public class ApplicationMetricsRetriever extends AbstractComponent implements Runnable {
private static final Logger log = Logger.getLogger(ApplicationMetricsRetriever.class.getName());
static final int MAX_THREADS = 20;
static final Duration MIN_TIMEOUT = Duration.ofSeconds(60);
static final Duration MAX_TIMEOUT = Duration.ofSeconds(240);
private static final int HTTP_CONNECT_TIMEOUT = 5000;
private static final int HTTP_SOCKET_TIMEOUT = 30000;
private static final Duration METRICS_TTL = Duration.ofSeconds(30);
private final HttpClient httpClient = createHttpClient();
private final List<NodeMetricsClient> clients;
private final ExecutorService fetchPool;
private final Thread pollThread;
private final Set<ConsumerId> consumerSet;
private long pollCount = 0;
private boolean stopped;
// Non-final for testing
private Duration taskTimeout;
@Inject
public ApplicationMetricsRetriever(MetricsNodesConfig nodesConfig) {
clients = createNodeClients(nodesConfig);
int numThreads = Math.min(clients.size(), MAX_THREADS);
taskTimeout = timeout(clients.size(), numThreads);
fetchPool = Executors.newFixedThreadPool(numThreads, ThreadFactoryFactory.getDaemonThreadFactory("metrics-fetcher"));
stopped = false;
consumerSet = new HashSet<>();
consumerSet.add(defaultMetricsConsumerId);
pollThread = new Thread(this, "metrics-poller");
pollThread.setDaemon(true);
pollThread.start();
}
@Override
public void run() {
try {
while (true) {
ConsumerId [] consumers;
synchronized (pollThread) {
consumers = consumerSet.toArray(new ConsumerId[0]);
}
for (ConsumerId consumer : consumers) {
int numFailed = fetchMetricsAsync(consumer);
if (numFailed > 0 ) {
log.log(Level.WARNING, "Updated metrics for consumer '" + consumer +"' failed for " + numFailed + " services");
} else {
log.log(Level.FINE, "Updated metrics for consumer '" + consumer +"'.");
}
}
Duration timeUntilNextPoll = Duration.ofMillis(1000);
synchronized (pollThread) {
pollCount++;
pollThread.notifyAll();
pollThread.wait(timeUntilNextPoll.toMillis());
if (stopped) return;
}
}
} catch (InterruptedException e) {}
}
@Override
public void deconstruct() {
synchronized (pollThread) {
stopped = true;
pollThread.notifyAll();
}
fetchPool.shutdownNow();
try {
pollThread.join();
} catch (InterruptedException e) {}
super.deconstruct();
}
public Map<Node, List<MetricsPacket>> getMetrics() {
return getMetrics(defaultMetricsConsumerId);
}
public Map<Node, List<MetricsPacket>> getMetrics(ConsumerId consumer) {
log.log(Level.INFO, () -> "Retrieving metrics from " + clients.size() + " nodes.");
synchronized (pollThread) {
if (consumerSet.add(consumer)) {
// Wakeup poll thread first time we see a new consumer
pollThread.notifyAll();
}
}
Map<Node, List<MetricsPacket>> metrics = new HashMap<>();
for (NodeMetricsClient client : clients) {
metrics.put(client.node, client.getMetrics(consumer));
}
return metrics;
}
void startPollAnwWait() {
try {
synchronized (pollThread) {
if ( ! pollThread.isAlive()) {
pollThread.start();
}
long before = pollCount;
pollThread.notifyAll();
while (pollCount == before) {
pollThread.wait();
}
}
} catch (InterruptedException e) {}
}
private int fetchMetricsAsync(ConsumerId consumer) {
Map<Node, Future<Boolean>> futures = new HashMap<>();
for (NodeMetricsClient client : clients) {
futures.put(client.node, fetchPool.submit(() -> updateMetrics(client, consumer)));
}
int numOk = 0;
int numTried = futures.size();
for (Map.Entry<Node, Future<Boolean>> entry : futures.entrySet()) {
try {
Boolean result = entry.getValue().get(taskTimeout.toMillis(), TimeUnit.MILLISECONDS);
if (result != null && result) numOk++;
} catch (InterruptedException | ExecutionException | TimeoutException e) {
// Since the task is a ForkJoinTask, we don't need special handling of InterruptedException
log.log(Level.WARNING, "Failed retrieving metrics for '" + entry.getKey() + "' : ", e);
}
}
log.log(Level.INFO, () -> "Finished retrieving metrics from " + clients.size() + " nodes.");
return numTried - numOk;
}
private boolean updateMetrics(NodeMetricsClient client, ConsumerId consumer) {
try {
return client.updateSnapshots(consumer, METRICS_TTL);
} catch (Exception e) {
log.log(Level.WARNING, "Could not retrieve metrics from " + client.node.metricsUri(consumer), e);
return false;
}
}
private List<NodeMetricsClient> createNodeClients(MetricsNodesConfig nodesConfig) {
return nodesConfig.node().stream()
.map(Node::new)
.map(node-> new NodeMetricsClient(httpClient, node, Clock.systemUTC()))
.collect(Collectors.toList());
}
private static CloseableHttpClient createHttpClient() {
return VespaHttpClientBuilder.create()
.setUserAgent("application-metrics-retriever")
.setDefaultRequestConfig(RequestConfig.custom()
.setConnectTimeout(Timeout.ofMilliseconds(HTTP_CONNECT_TIMEOUT))
.setResponseTimeout(Timeout.ofMilliseconds(HTTP_SOCKET_TIMEOUT))
.build())
.build();
}
static Duration timeout(int clients, int numThreads) {
Duration timeout = Duration.ofSeconds(Long.max(MIN_TIMEOUT.toSeconds(), 20 * clients / numThreads));
return timeout.compareTo(MAX_TIMEOUT) > 0 ? MAX_TIMEOUT : timeout;
}
// For testing only!
void setTaskTimeout(Duration taskTimeout) {
this.taskTimeout = taskTimeout;
}
}
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