tillrohrmann commented on a change in pull request #11408: [FLINK-15989][FLINK-16225] Improve direct and metaspace out-of-memory error handling URL: https://github.com/apache/flink/pull/11408#discussion_r395643722
########## File path: flink-tests/src/test/java/org/apache/flink/runtime/util/ExceptionUtilsITCases.java ########## @@ -0,0 +1,122 @@ +/* + * 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.apache.flink.runtime.util; + +import org.apache.flink.test.util.TestProcessBuilder; +import org.apache.flink.test.util.TestProcessBuilder.TestProcess; +import org.apache.flink.testutils.ClassLoaderUtils; +import org.apache.flink.testutils.ClassLoaderUtils.ClassLoaderBuilder; +import org.apache.flink.util.ExceptionUtils; + +import org.junit.ClassRule; +import org.junit.Test; +import org.junit.rules.TemporaryFolder; + +import java.io.File; +import java.io.IOException; +import java.lang.management.ManagementFactory; +import java.lang.management.MemoryPoolMXBean; +import java.util.ArrayList; +import java.util.Collection; + +import static org.hamcrest.CoreMatchers.is; +import static org.junit.Assert.assertThat; + +/** + * Tests for {@link ExceptionUtils} which require to spawn JVM process and set JVM memory args. + */ +public class ExceptionUtilsITCases { + private static final long INITIAL_BIG_METASPACE_SIZE = 128 * (1 << 20); // 128Mb + + @ClassRule + public static final TemporaryFolder TEMPORARY_FOLDER = new TemporaryFolder(); + + @Test + public void testIsMetaspaceOutOfMemoryError() throws IOException, InterruptedException { + // load only one class and record required Metaspace + long okMetaspace = Long.parseLong(run(1, INITIAL_BIG_METASPACE_SIZE)); + // load more classes to cause 'OutOfMemoryError: Metaspace' + assertThat(run(1000, okMetaspace), is("")); + } + + private static String run(int numberOfLoadedClasses, long metaspaceSize) throws InterruptedException, IOException { + TestProcessBuilder taskManagerProcessBuilder = new TestProcessBuilder(DummyClassLoadingProgram.class.getName()); + taskManagerProcessBuilder.addJvmArg("-XX:-UseCompressedOops"); + taskManagerProcessBuilder.addJvmArg(String.format("-XX:MaxMetaspaceSize=%d", metaspaceSize)); + taskManagerProcessBuilder.addMainClassArg(Integer.toString(numberOfLoadedClasses)); + taskManagerProcessBuilder.addMainClassArg(TEMPORARY_FOLDER.getRoot().getAbsolutePath()); + TestProcess p = taskManagerProcessBuilder.start(); + p.getProcess().waitFor(); + assertThat(p.getErrorOutput().toString().trim(), is("")); + return p.getProcessOutput().toString().trim(); + } + + /** + * Dummy java program to generate Metaspace OOM. + */ + public static class DummyClassLoadingProgram { + private DummyClassLoadingProgram() { + } + + public static void main(String[] args) { + // trigger needed classes loaded Review comment: ```suggestion // triggers loading needed classes ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
