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Add a monitor for the OpenMetrics endpoint. This populates the runnin…
…g and queued query metrics for active load balancing, and allows defining health using minimum and maximum values for arbitrary metrics
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gateway-ha/src/main/java/io/trino/gateway/ha/clustermonitor/ClusterStatsMetricsMonitor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package io.trino.gateway.ha.clustermonitor; | ||
|
|
||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.common.collect.ImmutableSet; | ||
| import io.airlift.http.client.HttpClient; | ||
| import io.airlift.http.client.HttpUriBuilder; | ||
| import io.airlift.http.client.Request; | ||
| import io.airlift.http.client.Response; | ||
| import io.airlift.http.client.ResponseHandler; | ||
| import io.airlift.http.client.UnexpectedResponseException; | ||
| import io.airlift.log.Logger; | ||
| import io.trino.gateway.ha.config.BackendStateConfiguration; | ||
| import io.trino.gateway.ha.config.MonitorConfiguration; | ||
| import io.trino.gateway.ha.config.ProxyBackendConfiguration; | ||
| import io.trino.gateway.ha.security.util.BasicCredentials; | ||
|
|
||
| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
|
|
||
| import static com.google.common.base.Strings.isNullOrEmpty; | ||
| import static com.google.common.collect.ImmutableMap.toImmutableMap; | ||
| import static io.airlift.http.client.HttpUriBuilder.uriBuilderFrom; | ||
| import static io.airlift.http.client.Request.Builder.prepareGet; | ||
| import static io.airlift.http.client.ResponseHandlerUtils.propagate; | ||
| import static io.trino.gateway.ha.clustermonitor.ClusterStatsMonitor.shouldRetry; | ||
| import static java.nio.charset.StandardCharsets.UTF_8; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public class ClusterStatsMetricsMonitor | ||
| implements ClusterStatsMonitor | ||
| { | ||
| public static final String RUNNING_QUERIES_METRIC = "trino_execution_name_QueryManager_RunningQueries"; | ||
| public static final String QUEUED_QUERIES_METRIC = "trino_execution_name_QueryManager_QueuedQueries"; | ||
| private static final Logger log = Logger.get(ClusterStatsMetricsMonitor.class); | ||
| private final HttpClient client; | ||
| private final int retries; | ||
| private final MetricsResponseHandler metricsResponseHandler; | ||
| private final Header identityHeader; | ||
| private final String metricsEndpoint; | ||
| private final ImmutableSet<String> metricNames; | ||
| private final Map<String, Float> metricMinimumValues; | ||
| private final Map<String, Float> metricMaximumValues; | ||
|
|
||
| public ClusterStatsMetricsMonitor(HttpClient client, BackendStateConfiguration backendStateConfiguration, MonitorConfiguration monitorConfiguration) | ||
| { | ||
| this.client = requireNonNull(client, "client is null"); | ||
| retries = monitorConfiguration.getRetries(); | ||
| if (!isNullOrEmpty(backendStateConfiguration.getPassword())) { | ||
| identityHeader = new Header("Authorization", | ||
| new BasicCredentials(backendStateConfiguration.getUsername(), backendStateConfiguration.getPassword()).getBasicAuthHeader()); | ||
| } | ||
| else { | ||
| identityHeader = new Header("X-Trino-User", backendStateConfiguration.getUsername()); | ||
| } | ||
| metricsEndpoint = monitorConfiguration.getMetricsEndpoint(); | ||
| metricMinimumValues = monitorConfiguration.getMetricMinimumValues(); | ||
| metricMaximumValues = monitorConfiguration.getMetricMaximumValues(); | ||
| metricNames = ImmutableSet.<String>builder() | ||
| .add(RUNNING_QUERIES_METRIC, QUEUED_QUERIES_METRIC) | ||
| .addAll(metricMinimumValues.keySet()) | ||
| .addAll(metricMaximumValues.keySet()) | ||
| .build(); | ||
| metricsResponseHandler = new MetricsResponseHandler(metricNames); | ||
| } | ||
|
|
||
| private ClusterStats getUnhealthyStats(ProxyBackendConfiguration backend) | ||
| { | ||
| return ClusterStats.builder(backend.getName()) | ||
| .trinoStatus(TrinoStatus.UNHEALTHY) | ||
| .proxyTo(backend.getProxyTo()) | ||
| .externalUrl(backend.getExternalUrl()) | ||
| .routingGroup(backend.getRoutingGroup()) | ||
| .build(); | ||
| } | ||
|
|
||
| @Override | ||
| public ClusterStats monitor(ProxyBackendConfiguration backend) | ||
| { | ||
| Map<String, String> metrics = getMetrics(backend.getProxyTo(), retries); | ||
| if (metrics.isEmpty()) { | ||
| log.error(String.format("No metrics available for %s!", backend.getName())); | ||
| return getUnhealthyStats(backend); | ||
| } | ||
|
|
||
| for (Map.Entry<String, Float> entry : metricMinimumValues.entrySet()) { | ||
| if (!metrics.containsKey(entry.getKey()) | ||
| || Float.parseFloat(metrics.get(entry.getKey())) < entry.getValue()) { | ||
| log.warn(String.format("Health metric value below min for cluster %s: %s=%s", backend.getName(), entry.getKey(), metrics.get(entry.getKey()))); | ||
| return getUnhealthyStats(backend); | ||
| } | ||
| } | ||
|
|
||
| for (Map.Entry<String, Float> entry : metricMaximumValues.entrySet()) { | ||
| if (!metrics.containsKey(entry.getKey()) | ||
| || Float.parseFloat(metrics.get(entry.getKey())) > entry.getValue()) { | ||
| log.warn(String.format("Health metric value over max for cluster %s: %s=%s", backend.getName(), entry.getKey(), metrics.get(entry.getKey()))); | ||
| return getUnhealthyStats(backend); | ||
| } | ||
| } | ||
| return ClusterStats.builder(backend.getName()) | ||
| .trinoStatus(TrinoStatus.HEALTHY) | ||
| .runningQueryCount((int) Float.parseFloat(metrics.get(RUNNING_QUERIES_METRIC))) | ||
| .queuedQueryCount((int) Float.parseFloat(metrics.get(QUEUED_QUERIES_METRIC))) | ||
| .proxyTo(backend.getProxyTo()) | ||
| .externalUrl(backend.getExternalUrl()) | ||
| .routingGroup(backend.getRoutingGroup()) | ||
| .build(); | ||
| } | ||
|
|
||
| private Map<String, String> getMetrics(String baseUrl, int retriesRemaining) | ||
| { | ||
| HttpUriBuilder uri = uriBuilderFrom(URI.create(baseUrl)).appendPath(metricsEndpoint); | ||
| for (String metric : metricNames) { | ||
| uri.addParameter("name[]", metric); | ||
| } | ||
|
|
||
| Request request = prepareGet() | ||
| .setUri(uri.build()) | ||
| .addHeader(identityHeader.name, identityHeader.value) | ||
| .addHeader("Content-Type", "application/openmetrics-text; version=1.0.0; charset=utf-8") | ||
| .build(); | ||
| try { | ||
| return client.execute(request, metricsResponseHandler); | ||
| } | ||
| catch (UnexpectedResponseException e) { | ||
| if (shouldRetry(e.getStatusCode())) { | ||
| if (retriesRemaining > 0) { | ||
| log.warn("Retrying health check on error: %s, ", e.toString()); | ||
| return getMetrics(baseUrl, retriesRemaining - 1); | ||
| } | ||
| else { | ||
| log.error("Encountered error %s, no retries remaining", e.toString()); | ||
| } | ||
| } | ||
| else { | ||
| log.error(e, "Health check failed with non-retryable response. %s\n%s", e.getMessage(), e.toString()); | ||
| } | ||
| } | ||
| catch (Exception e) { | ||
| log.error(e, "Exception checking %s for health", request.getUri()); | ||
| } | ||
| return ImmutableMap.of(); | ||
| } | ||
|
|
||
| private static class MetricsResponseHandler | ||
| implements ResponseHandler<Map<String, String>, RuntimeException> | ||
| { | ||
| private final ImmutableSet<String> requiredKeys; | ||
|
|
||
| public MetricsResponseHandler(ImmutableSet<String> requiredKeys) | ||
| { | ||
| this.requiredKeys = requiredKeys; | ||
| } | ||
|
|
||
| @Override | ||
| public Map<String, String> handleException(Request request, Exception exception) | ||
| throws RuntimeException | ||
| { | ||
| throw propagate(request, exception); | ||
| } | ||
|
|
||
| @Override | ||
| public Map<String, String> handle(Request request, Response response) | ||
| throws RuntimeException | ||
| { | ||
| try { | ||
| String responseBody = new String(response.getInputStream().readAllBytes(), UTF_8); | ||
| Map<String, String> metrics = Arrays.stream(responseBody.split("\n")) | ||
| .filter(s -> !s.startsWith("#")) | ||
| .collect(toImmutableMap(s -> s.split(" ")[0], s -> s.split(" ")[1])); | ||
| if (!metrics.keySet().containsAll(requiredKeys)) { | ||
| throw new UnexpectedResponseException( | ||
| String.format("Request is missing required keys: \n%s\nin response: '%s'", String.join("\n", requiredKeys), responseBody), | ||
| request, | ||
| response); | ||
| } | ||
| return metrics; | ||
| } | ||
| catch (IOException e) { | ||
| throw new UnexpectedResponseException(request, response); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private record Header(String name, String value) {} | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -18,5 +18,6 @@ public enum ClusterStatsMonitorType | |
| NOOP, | ||
| INFO_API, | ||
| UI_API, | ||
| JDBC | ||
| JDBC, | ||
| METRICS | ||
| } | ||
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