/**
* 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.server.namenode;
import static org.junit.Assert.*;
import java.io.File;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSImage.NameNodeFile;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test the name node's ability to recover from partially corrupted storage
* directories.
*/
public class TestNameNodeCorruptionRecovery {
private MiniDFSCluster cluster;
@Before
public void setUpCluster() throws IOException {
cluster = new MiniDFSCluster(new Configuration(), 0, true, null);
cluster.waitActive();
}
@After
public void tearDownCluster() {
cluster.shutdown();
}
/**
* Test that a corrupted fstime file in a single storage directory does not
* prevent the NN from starting up.
*/
@Test
public void testFsTimeFileCorrupt() throws IOException, InterruptedException {
assertEquals(cluster.getNameDirs().size(), 2);
// Get the first fstime file and truncate it.
truncateStorageDirFile(cluster, NameNodeFile.TIME, 0);
// Make sure we can start up despite the fact the fstime file is corrupted.
cluster.restartNameNode();
}
private static void truncateStorageDirFile(MiniDFSCluster cluster,
NameNodeFile f, int storageDirIndex) throws IOException {
File currentDir = cluster.getNameNode().getFSImage()
.getStorageDir(storageDirIndex).getCurrentDir();
File nameNodeFile = new File(currentDir, f.getName());
assertTrue(nameNodeFile.isFile());
assertTrue(nameNodeFile.delete());
assertTrue(nameNodeFile.createNewFile());
}
}