[GitHub] kl0u commented on a change in pull request #7056: [FLINK-10634][metrics][rest] Add metrics availability e2e test

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kl0u commented on a change in pull request #7056: [FLINK-10634][metrics][rest] Add metrics availability e2e test
URL: https://github.com/apache/flink/pull/7056#discussion_r232591919
 
 

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 File path: flink-end-to-end-tests/flink-metrics-availability-test/src/test/java/org/pache/flink/metrics/tests/MetricsAvailabilityITCase.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.pache.flink.metrics.tests;
+
+import org.apache.flink.api.common.time.Deadline;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.concurrent.ScheduledExecutorServiceAdapter;
+import org.apache.flink.runtime.rest.RestClient;
+import org.apache.flink.runtime.rest.RestClientConfiguration;
+import org.apache.flink.runtime.rest.messages.EmptyMessageParameters;
+import org.apache.flink.runtime.rest.messages.EmptyRequestBody;
+import org.apache.flink.runtime.rest.messages.job.metrics.JobManagerMetricsHeaders;
+import org.apache.flink.runtime.rest.messages.job.metrics.JobManagerMetricsMessageParameters;
+import org.apache.flink.runtime.rest.messages.job.metrics.MetricCollectionResponseBody;
+import org.apache.flink.runtime.rest.messages.job.metrics.TaskManagerMetricsHeaders;
+import org.apache.flink.runtime.rest.messages.job.metrics.TaskManagerMetricsMessageParameters;
+import org.apache.flink.runtime.rest.messages.taskmanager.TaskManagerInfo;
+import org.apache.flink.runtime.rest.messages.taskmanager.TaskManagersHeaders;
+import org.apache.flink.runtime.rest.messages.taskmanager.TaskManagersInfo;
+import org.apache.flink.tests.util.FlinkDistribution;
+import org.apache.flink.util.TestLogger;
+import org.apache.flink.util.function.SupplierWithException;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+
+import javax.annotation.Nullable;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+/**
+ * End-to-end test for the availability of metrics.
+ */
+public class MetricsAvailabilityITCase extends TestLogger {
+
+	private static final String HOST = "localhost";
+	private static final int PORT = 8081;
+
+	@Rule
+	public final FlinkDistribution dist = new FlinkDistribution();
+
+	@Nullable
+	private static ScheduledExecutorService scheduledExecutorService = null;
+
+	@BeforeClass
+	public static void startExecutor() {
+		scheduledExecutorService = Executors.newScheduledThreadPool(4);
+	}
+
+	@AfterClass
+	public static void shutdownExecutor() {
+		if (scheduledExecutorService != null) {
+			scheduledExecutorService.shutdown();
+		}
+	}
+
+	@Test
+	public void testReporter() throws Exception {
+		dist.startFlinkCluster();
+
+		final RestClient restClient = new RestClient(RestClientConfiguration.fromConfiguration(new Configuration()), scheduledExecutorService);
+
+		checkJobManagerMetricAvailability(restClient);
+
+		final Collection<ResourceID> taskManagerIds = getTaskManagerIds(restClient);
+
+		for (final ResourceID taskManagerId : taskManagerIds) {
+			checkTaskManagerMetricAvailability(restClient, taskManagerId);
+		}
+	}
+
+	private static void checkJobManagerMetricAvailability(final RestClient restClient) throws Exception {
+		final JobManagerMetricsHeaders headers = JobManagerMetricsHeaders.getInstance();
+		final JobManagerMetricsMessageParameters parameters = headers.getUnresolvedMessageParameters();
+		parameters.metricsFilterParameter.resolve(Collections.singletonList("numRegisteredTaskManagers"));
+
+		fetchMetric(() ->
+				restClient.sendRequest(HOST, PORT, headers, parameters, EmptyRequestBody.getInstance()),
+			getMetricNamePredicate("numRegisteredTaskManagers"));
+	}
+
+	private static Collection<ResourceID> getTaskManagerIds(final RestClient restClient) throws Exception {
+		final TaskManagersHeaders headers = TaskManagersHeaders.getInstance();
+
+		final TaskManagersInfo response = fetchMetric(() ->
+				restClient.sendRequest("localhost",
+					8081,
 
 Review comment:
   Replace with `PORT`

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