/**
* 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.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
import org.apache.hadoop.hdfs.qjournal.MiniQJMHACluster;
import org.apache.hadoop.hdfs.server.common.IncorrectVersionException;
import org.apache.hadoop.hdfs.server.namenode.NNStorage;
import org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion;
import org.junit.Assert;
import org.junit.Test;
public class TestRollingUpgradeDowngrade {
@Test(timeout = 300000)
public void testDowngrade() throws Exception {
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);
Assert.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.
Assert.assertFalse(dfsCluster.getNamesystem(0).getFSImage()
.hasRollbackFSImage());
// shutdown NN1
dfsCluster.shutdownNameNode(1);
dfsCluster.transitionToActive(0);
dfs = dfsCluster.getFileSystem(0);
Assert.assertTrue(dfs.exists(foo));
Assert.assertTrue(dfs.exists(bar));
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
/**
* Ensure that during downgrade the NN fails to load a fsimage with newer
* format.
*/
@Test(expected = IncorrectVersionException.class)
public void testRejectNewFsImage() throws IOException {
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.SAFEMODE_ENTER);
fs.saveNamespace();
fs.setSafeMode(SafeModeAction.SAFEMODE_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();
}
}
}
}