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.master;
  
  import static org.junit.Assert.assertThrows;
  import static org.junit.Assert.assertTrue;
  
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.grpc.NodeState;
  import alluxio.master.journal.JournalSystem;
  import alluxio.master.journal.JournalType;
  import alluxio.master.journal.JournalUtils;
  import alluxio.master.journal.ufs.UfsJournal;
  import alluxio.master.journal.ufs.UfsJournalLogWriter;
  import alluxio.master.journal.ufs.UfsJournalSingleMasterPrimarySelector;
  import alluxio.master.journal.ufs.UfsJournalSystem;
  import alluxio.proto.journal.File;
  import alluxio.proto.journal.Journal;
  import alluxio.util.CommonUtils;
  import alluxio.util.URIUtils;
  
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  
  import java.net.URI;
  import java.util.Collections;
  import java.util.NoSuchElementException;
  
  /**
   * This tests the emergency backup feature when encountering journal corruption.
   */
  public class AlluxioMasterProcessEmergencyBackupTest {
    @Rule
    public PortReservationRule mRpcPortRule = new PortReservationRule();
    @Rule
    public PortReservationRule mWebPortRule = new PortReservationRule();
    @Rule
    public TemporaryFolder mFolder = new TemporaryFolder();
  
    @Before
    public void before() throws Exception {
      Configuration.reloadProperties();
      Configuration.set(PropertyKey.MASTER_RPC_PORT, mRpcPortRule.getPort());
      Configuration.set(PropertyKey.MASTER_WEB_PORT, mWebPortRule.getPort());
      Configuration.set(PropertyKey.MASTER_METASTORE_DIR, mFolder.newFolder("metastore"));
      Configuration.set(PropertyKey.USER_METRICS_COLLECTION_ENABLED, false);
      Configuration.set(PropertyKey.MASTER_JOURNAL_FOLDER, mFolder.newFolder("journal"));
    }
  
    @Test
    public void failToGainPrimacyWhenJournalCorrupted() throws Exception {
      Configuration.set(PropertyKey.MASTER_JOURNAL_TYPE, JournalType.UFS);
      Configuration.set(PropertyKey.MASTER_JOURNAL_BACKUP_WHEN_CORRUPTED, false);
      URI journalLocation = JournalUtils.getJournalLocation();
      JournalSystem journalSystem = new JournalSystem.Builder()
          .setLocation(journalLocation).build(CommonUtils.ProcessType.MASTER);
      AlluxioMasterProcess masterProcess = new AlluxioMasterProcess(journalSystem,
          new UfsJournalSingleMasterPrimarySelector());
      corruptJournalAndStartMasterProcess(masterProcess, journalLocation);
    }
  
    @Test
    public void failToGainPrimacyWhenJournalCorruptedHA() throws Exception {
      Configuration.set(PropertyKey.MASTER_JOURNAL_TYPE, JournalType.UFS);
      Configuration.set(PropertyKey.MASTER_JOURNAL_BACKUP_WHEN_CORRUPTED, false);
      URI journalLocation = JournalUtils.getJournalLocation();
      JournalSystem journalSystem = new JournalSystem.Builder()
          .setLocation(journalLocation).build(CommonUtils.ProcessType.MASTER);
      ControllablePrimarySelector primarySelector = new ControllablePrimarySelector();
      AlluxioMasterProcess masterProcess =
          new AlluxioMasterProcess(journalSystem, primarySelector);
      primarySelector.setState(NodeState.PRIMARY);
      corruptJournalAndStartMasterProcess(masterProcess, journalLocation);
    }
  
    private void corruptJournalAndStartMasterProcess(AlluxioMasterProcess masterProcess,
        URI journalLocation) throws Exception {
      assertTrue(masterProcess.mJournalSystem instanceof UfsJournalSystem);
      masterProcess.mJournalSystem.format();
      // corrupt the journal
      UfsJournal fsMaster =
          new UfsJournal(URIUtils.appendPathOrDie(journalLocation, "FileSystemMaster"),
              new NoopMaster(), 0, Collections::emptySet);
      fsMaster.start();
      fsMaster.gainPrimacy();
      long nextSN = 0;
      try (UfsJournalLogWriter writer = new UfsJournalLogWriter(fsMaster, nextSN)) {
        Journal.JournalEntry entry = Journal.JournalEntry.newBuilder()
            .setSequenceNumber(nextSN)
            .setDeleteFile(File.DeleteFileEntry.newBuilder()
                .setId(4563728) // random non-zero ID number (zero would delete the root)
                .setPath("/nonexistant")
                .build())
            .build();
        writer.write(entry);
        writer.flush();
      }
      // comes from mJournalSystem#gainPrimacy
      RuntimeException exception = assertThrows(RuntimeException.class, masterProcess::start);
      assertTrue(exception.getMessage().contains(NoSuchElementException.class.getName()));
      // if AlluxioMasterProcess#start throws an exception, then #stop will get called
      masterProcess.stop();
      assertTrue(masterProcess.isStopped());
    }
  }
  