TestRollingUpgradeDowngrade.java

/**
 * 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.hdfs;

import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.spy;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
import org.apache.hadoop.hdfs.qjournal.MiniQJMHACluster;
import org.apache.hadoop.hdfs.server.namenode.NNStorage;
import org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;

public class TestRollingUpgradeDowngrade {

  /**
   * Downgrade option is already obsolete. It should throw exception.
   * @throws Exception
   */
  @Test
  @Timeout(value = 300)
  public void testDowngrade() throws Exception {
    Assertions.assertThrows(IllegalArgumentException.class, () -> {
      final Configuration conf = new HdfsConfiguration();
      MiniQJMHACluster cluster = null;
      final Path foo = new Path("/foo");
      final Path bar = new Path("/bar");
      try {
        cluster = new MiniQJMHACluster.Builder(conf).build();
        MiniDFSCluster dfsCluster = cluster.getDfsCluster();
        dfsCluster.waitActive();

        // let NN1 tail editlog every 1s
        dfsCluster.getConfiguration(1).setInt(
            DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
        dfsCluster.restartNameNode(1);

        dfsCluster.transitionToActive(0);
        DistributedFileSystem dfs = dfsCluster.getFileSystem(0);
        dfs.mkdirs(foo);

        // start rolling upgrade
        RollingUpgradeInfo info = dfs
            .rollingUpgrade(RollingUpgradeAction.PREPARE);
        Assertions.assertTrue(info.isStarted());
        dfs.mkdirs(bar);

        TestRollingUpgrade.queryForPreparation(dfs);
        dfs.close();

        dfsCluster.restartNameNode(0, true, "-rollingUpgrade", "downgrade");
        // Once downgraded, there should be no more fsimage for rollbacks.
        Assertions.assertFalse(dfsCluster.getNamesystem(0).getFSImage()
            .hasRollbackFSImage());
        // shutdown NN1
        dfsCluster.shutdownNameNode(1);
        dfsCluster.transitionToActive(0);

        dfs = dfsCluster.getFileSystem(0);
        Assertions.assertTrue(dfs.exists(foo));
        Assertions.assertTrue(dfs.exists(bar));
      } finally {
        if (cluster != null) {
          cluster.shutdown();
        }
      }
    });
  }

  /**
   * Ensure that restart namenode with downgrade option should throw exception
   * because it has been obsolete.
   */
  @Test
  public void testRejectNewFsImage() throws IOException {
    Assertions.assertThrows(IllegalArgumentException.class, () -> {
      final Configuration conf = new Configuration();
      MiniDFSCluster cluster = null;
      try {
        cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
        cluster.waitActive();
        DistributedFileSystem fs = cluster.getFileSystem();
        fs.setSafeMode(SafeModeAction.ENTER);
        fs.saveNamespace();
        fs.setSafeMode(SafeModeAction.LEAVE);
        NNStorage storage = spy(cluster.getNameNode().getFSImage().getStorage());
        int futureVersion = NameNodeLayoutVersion.CURRENT_LAYOUT_VERSION - 1;
        doReturn(futureVersion).when(storage).getServiceLayoutVersion();
        storage.writeAll();
        cluster.restartNameNode(0, true, "-rollingUpgrade", "downgrade");
      } finally {
        if (cluster != null) {
          cluster.shutdown();
        }
      }
    });
  }
}