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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.apache.flink.test.runtime.minicluster;
import akka.actor.ActorSystem;
import akka.testkit.JavaTestKit;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.akka.AkkaUtils;
import org.apache.flink.runtime.highavailability.HighAvailabilityServices;
import org.apache.flink.runtime.instance.AkkaActorGateway;
import org.apache.flink.runtime.instance.ActorGateway;
import org.apache.flink.runtime.messages.JobManagerMessages;
import org.apache.flink.runtime.minicluster.LocalFlinkMiniCluster;
import org.apache.flink.runtime.testingUtils.TestingUtils;
import org.apache.flink.util.TestLogger;
import org.junit.Test;
import scala.concurrent.ExecutionContext$;
import scala.concurrent.forkjoin.ForkJoinPool;
import scala.concurrent.impl.ExecutionContextImpl;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import static org.junit.Assert.fail;
public class LocalFlinkMiniClusterITCase extends TestLogger {
private static String[] ALLOWED_THREAD_PREFIXES = { };
@Test
public void testLocalFlinkMiniClusterWithMultipleTaskManagers() {
final ActorSystem system = ActorSystem.create("Testkit", AkkaUtils.getDefaultAkkaConfig());
LocalFlinkMiniCluster miniCluster = null;
final int numTMs = 3;
final int numSlots = 14;
// gather the threads that already exist
final Set<Thread> threadsBefore = new HashSet<>();
{
final Thread[] allThreads = new Thread[Thread.activeCount()];
Thread.enumerate(allThreads);
threadsBefore.addAll(Arrays.asList(allThreads));
}
try {
Configuration config = new Configuration();
config.setInteger(ConfigConstants.LOCAL_NUMBER_TASK_MANAGER, numTMs);
config.setInteger(ConfigConstants.TASK_MANAGER_NUM_TASK_SLOTS, numSlots);
miniCluster = new LocalFlinkMiniCluster(config, true);
miniCluster.start();
final ActorGateway jmGateway = miniCluster.getLeaderGateway(TestingUtils.TESTING_DURATION());
new JavaTestKit(system) {{
final ActorGateway selfGateway = new AkkaActorGateway(getRef(), HighAvailabilityServices.DEFAULT_LEADER_ID);
new Within(TestingUtils.TESTING_DURATION()) {
@Override
protected void run() {
jmGateway.tell(
JobManagerMessages.getRequestNumberRegisteredTaskManager(),
selfGateway);
expectMsgEquals(TestingUtils.TESTING_DURATION(), numTMs);
jmGateway.tell(
JobManagerMessages.getRequestTotalNumberOfSlots(),
selfGateway);
expectMsgEquals(TestingUtils.TESTING_DURATION(), numTMs*numSlots);
}
};
}};
} finally {
if (miniCluster != null) {
miniCluster.stop();
miniCluster.awaitTermination();
}
JavaTestKit.shutdownActorSystem(system);
system.awaitTermination();
}
// shut down the global execution context, to make sure it does not affect this testing
try {
Field f = ExecutionContextImpl.class.getDeclaredField("executor");
f.setAccessible(true);
Object exec = ExecutionContext$.MODULE$.global();
ForkJoinPool executor = (ForkJoinPool) f.get(exec);
executor.shutdownNow();
}
catch (Exception e) {
System.err.println("Cannot test proper thread shutdown for local execution.");
return;
}
// check for remaining threads
// we need to check repeatedly for a while, because some threads shut down slowly
long deadline = System.currentTimeMillis() + 30000;
boolean foundThreads = true;
String threadName = "";
while (System.currentTimeMillis() < deadline) {
// check that no additional threads remain
final Thread[] threadsAfter = new Thread[Thread.activeCount()];
Thread.enumerate(threadsAfter);
foundThreads = false;
for (Thread t : threadsAfter) {
if (t.isAlive() && !threadsBefore.contains(t)) {
// this thread was not there before. check if it is allowed
boolean allowed = false;
for (String prefix : ALLOWED_THREAD_PREFIXES) {
if (t.getName().startsWith(prefix)) {
allowed = true;
break;
}
}
if (!allowed) {
foundThreads = true;
threadName = t.toString();
break;
}
}
}
if (foundThreads) {
try {
Thread.sleep(500);
} catch (InterruptedException ignored) {}
} else {
break;
}
}
if (foundThreads) {
fail("Thread " + threadName + " was started by the mini cluster, but not shut down");
}
}
}