content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.server.ft;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  
  import alluxio.AlluxioURI;
  import alluxio.Constants;
  import alluxio.UnderFileSystemFactoryRegistryRule;
  import alluxio.client.file.FileSystem;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.MultiMasterLocalAlluxioCluster;
  import alluxio.testutils.BaseIntegrationTest;
  import alluxio.testutils.IntegrationTestUtils;
  import alluxio.testutils.underfs.delegating.DelegatingUnderFileSystem;
  import alluxio.testutils.underfs.delegating.DelegatingUnderFileSystemFactory;
  import alluxio.underfs.UnderFileSystem;
  import alluxio.underfs.options.DeleteOptions;
  import alluxio.util.CommonUtils;
  
  import com.google.common.io.Files;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.ClassRule;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TestName;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  
  public final class MasterFailoverIntegrationTest extends BaseIntegrationTest {
    private static final Logger LOG = LoggerFactory.getLogger(MasterFailoverIntegrationTest.class);
  
    private static final String LOCAL_UFS_PATH = Files.createTempDir().getAbsolutePath();
    private static final long DELETE_DELAY = 5 * Constants.SECOND_MS;
  
    private MultiMasterLocalAlluxioCluster mMultiMasterLocalAlluxioCluster;
    private FileSystem mFileSystem;
  
    // An under file system which has slow directory deletion.
    private static final UnderFileSystem UFS =
        new DelegatingUnderFileSystem(UnderFileSystem.Factory.create(LOCAL_UFS_PATH,
            Configuration.global())) {
          @Override
          public boolean deleteDirectory(String path) throws IOException {
            CommonUtils.sleepMs(DELETE_DELAY);
            return mUfs.deleteDirectory(path);
          }
  
          @Override
          public boolean deleteDirectory(String path, DeleteOptions options) throws IOException {
            CommonUtils.sleepMs(DELETE_DELAY);
            return mUfs.deleteDirectory(path, options);
          }
        };
  
    @Rule
    public TestName mTestName = new TestName();
  
    @ClassRule
    public static UnderFileSystemFactoryRegistryRule sUnderfilesystemfactoryregistry =
        new UnderFileSystemFactoryRegistryRule(new DelegatingUnderFileSystemFactory(UFS));
  
    @Before
    public final void before() throws Exception {
      mMultiMasterLocalAlluxioCluster =
          new MultiMasterLocalAlluxioCluster(2);
      mMultiMasterLocalAlluxioCluster.initConfiguration(
          IntegrationTestUtils.getTestName(getClass().getSimpleName(), mTestName.getMethodName()));
      Configuration.set(PropertyKey.USER_RPC_RETRY_MAX_DURATION, "60sec");
      Configuration.set(PropertyKey.USER_RPC_RETRY_MAX_SLEEP_MS, "1sec");
      Configuration.set(PropertyKey.NETWORK_CONNECTION_SERVER_SHUTDOWN_TIMEOUT, "30sec");
      Configuration.set(PropertyKey.MASTER_JOURNAL_TAILER_SHUTDOWN_QUIET_WAIT_TIME_MS, "0sec");
      Configuration.set(PropertyKey.MASTER_MOUNT_TABLE_ROOT_UFS,
          DelegatingUnderFileSystemFactory.DELEGATING_SCHEME + "://" + LOCAL_UFS_PATH);
      mMultiMasterLocalAlluxioCluster.start();
      mFileSystem = mMultiMasterLocalAlluxioCluster.getClient();
    }
  
    @After
    public final void after() throws Exception {
      mMultiMasterLocalAlluxioCluster.stop();
    }
  
    @Test
    public void failoverJournalFencingTest() throws Exception {
      // This test verifies that when a master fails over due to Zookeeper disconnection, outstanding
      // threads on the master are not allowed to write to the journal.
      AlluxioURI dir = new AlluxioURI("/dir");
      mFileSystem.createDirectory(dir);
      DeleteThread deleteThread = new DeleteThread(dir);
      deleteThread.start();
      // Give the delete thread a chance to start.
      Thread.sleep(500);
      mMultiMasterLocalAlluxioCluster.stopZk();
      // Give master a chance to notice that ZK is dead and trigger failover.
      Thread.sleep(10000);
      mMultiMasterLocalAlluxioCluster.restartZk();
      deleteThread.join();
      // After failing on the original master, the delete should be retried on the new master.
      assertFalse(mFileSystem.exists(dir));
      // Restart to make sure the journal is consistent (we didn't write two delete entries for /dir).
      mMultiMasterLocalAlluxioCluster.restartMasters();
      mFileSystem = mMultiMasterLocalAlluxioCluster.getClient(); // need new client after restart
      assertEquals(0, mFileSystem.listStatus(new AlluxioURI("/")).size());
    }
  
    private class DeleteThread extends Thread {
      public final AlluxioURI mDir;
  
      public DeleteThread(AlluxioURI dir) {
        mDir = dir;
      }
  
      @Override
      public void run() {
        try {
          LOG.info("Starting to delete {}", mDir);
          mFileSystem.delete(mDir);
          LOG.info("Deleted {}", mDir);
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
    }
  }
  