| /* |
| * 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.hadoop.ozone.container.replication; |
| |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.hadoop.hdds.conf.ConfigurationSource; |
| import org.apache.hadoop.hdds.conf.OzoneConfiguration; |
| import org.apache.hadoop.hdds.protocol.DatanodeDetails; |
| import org.apache.hadoop.hdds.protocol.MockDatanodeDetails; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /* |
| * Test SimpleContainerDownloader. |
| */ |
| public class TestSimpleContainerDownloader { |
| |
| private static final String SUCCESS_PATH = "downloaded"; |
| |
| @Test |
| public void testGetContainerDataFromReplicasHappyPath() throws Exception { |
| |
| //GIVEN |
| List<DatanodeDetails> datanodes = createDatanodes(); |
| |
| SimpleContainerDownloader downloader = |
| createDownloaderWithPredefinedFailures(true); |
| |
| //WHEN |
| final Path result = |
| downloader.getContainerDataFromReplicas(1L, datanodes) |
| .get(1L, TimeUnit.SECONDS); |
| |
| //THEN |
| Assert.assertEquals(datanodes.get(0).getUuidString(), result.toString()); |
| } |
| |
| @Test |
| public void testGetContainerDataFromReplicasDirectFailure() |
| throws Exception { |
| |
| //GIVEN |
| List<DatanodeDetails> datanodes = createDatanodes(); |
| |
| SimpleContainerDownloader downloader = |
| createDownloaderWithPredefinedFailures(true, datanodes.get(0)); |
| |
| //WHEN |
| final Path result = |
| downloader.getContainerDataFromReplicas(1L, datanodes) |
| .get(1L, TimeUnit.SECONDS); |
| |
| //THEN |
| //first datanode is failed, second worked |
| Assert.assertEquals(datanodes.get(1).getUuidString(), result.toString()); |
| } |
| |
| @Test |
| public void testGetContainerDataFromReplicasAsyncFailure() throws Exception { |
| |
| //GIVEN |
| List<DatanodeDetails> datanodes = createDatanodes(); |
| |
| SimpleContainerDownloader downloader = |
| createDownloaderWithPredefinedFailures(false, datanodes.get(0)); |
| |
| //WHEN |
| final Path result = |
| downloader.getContainerDataFromReplicas(1L, datanodes) |
| .get(1L, TimeUnit.SECONDS); |
| |
| //THEN |
| //first datanode is failed, second worked |
| Assert.assertEquals(datanodes.get(1).getUuidString(), result.toString()); |
| } |
| |
| /** |
| * Test if different datanode is used for each download attempt. |
| */ |
| @Test(timeout = 10_000L) |
| public void testRandomSelection() |
| throws ExecutionException, InterruptedException { |
| |
| //GIVEN |
| final List<DatanodeDetails> datanodes = createDatanodes(); |
| |
| SimpleContainerDownloader downloader = |
| new SimpleContainerDownloader(new OzoneConfiguration(), null) { |
| |
| @Override |
| protected CompletableFuture<Path> downloadContainer( |
| long containerId, DatanodeDetails datanode |
| ) { |
| //download is always successful. |
| return CompletableFuture |
| .completedFuture(Paths.get(datanode.getUuidString())); |
| } |
| }; |
| |
| //WHEN executed, THEN at least once the second datanode should be |
| //returned. |
| for (int i = 0; i < 10000; i++) { |
| Path path = |
| downloader.getContainerDataFromReplicas(1L, datanodes).get(); |
| if (path.toString().equals(datanodes.get(1).getUuidString())) { |
| return; |
| } |
| } |
| |
| //there is 1/3^10_000 chance for false positive, which is practically 0. |
| Assert.fail( |
| "Datanodes are selected 10000 times but second datanode was never " |
| + "used."); |
| } |
| |
| /** |
| * Creates downloader which fails with datanodes in the arguments. |
| * |
| * @param directException if false the exception will be wrapped in the |
| * returning future. |
| */ |
| private SimpleContainerDownloader createDownloaderWithPredefinedFailures( |
| boolean directException, |
| DatanodeDetails... failedDatanodes |
| ) { |
| |
| ConfigurationSource conf = new OzoneConfiguration(); |
| |
| final List<DatanodeDetails> datanodes = |
| Arrays.asList(failedDatanodes); |
| |
| return new SimpleContainerDownloader(conf, null) { |
| |
| //for retry testing we use predictable list of datanodes. |
| @Override |
| protected List<DatanodeDetails> shuffleDatanodes( |
| List<DatanodeDetails> sourceDatanodes |
| ) { |
| //turn off randomization |
| return sourceDatanodes; |
| } |
| |
| @Override |
| protected CompletableFuture<Path> downloadContainer( |
| long containerId, |
| DatanodeDetails datanode |
| ) { |
| |
| if (datanodes.contains(datanode)) { |
| if (directException) { |
| throw new RuntimeException("Unavailable datanode"); |
| } else { |
| return CompletableFuture.supplyAsync(() -> { |
| throw new RuntimeException("Unavailable datanode"); |
| }); |
| } |
| } else { |
| |
| //path includes the dn id to make it possible to assert. |
| return CompletableFuture.completedFuture( |
| Paths.get(datanode.getUuidString())); |
| } |
| |
| } |
| }; |
| } |
| |
| private List<DatanodeDetails> createDatanodes() { |
| List<DatanodeDetails> datanodes = new ArrayList<>(); |
| datanodes.add(MockDatanodeDetails.randomDatanodeDetails()); |
| datanodes.add(MockDatanodeDetails.randomDatanodeDetails()); |
| datanodes.add(MockDatanodeDetails.randomDatanodeDetails()); |
| return datanodes; |
| } |
| } |