/**
* 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.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType.DATA_NODE;
import static org.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType.NAME_NODE;
import java.io.File;
import java.io.IOException;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.server.common.StorageInfo;
import org.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType;
import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
/**
* This test ensures the appropriate response (successful or failure) from
* the system when the system is rolled back under various storage state and
* version conditions.
*/
public class TestDFSRollback extends TestCase {
private static final Log LOG = LogFactory.getLog(
"org.apache.hadoop.hdfs.TestDFSRollback");
private Configuration conf;
private int testCounter = 0;
private MiniDFSCluster cluster = null;
/**
* Writes an INFO log message containing the parameters.
*/
void log(String label, int numDirs) {
LOG.info("============================================================");
LOG.info("***TEST " + (testCounter++) + "*** "
+ label + ":"
+ " numDirs="+numDirs);
}
/**
* Verify that the new current directory is the old previous.
* It is assumed that the server has recovered and rolled back.
*/
void checkResult(NodeType nodeType, String[] baseDirs) throws IOException {
switch (nodeType) {
case NAME_NODE:
for (int i = 0; i < baseDirs.length; i++) {
assertTrue(new File(baseDirs[i],"current").isDirectory());
assertTrue(new File(baseDirs[i],"current/VERSION").isFile());
assertTrue(new File(baseDirs[i],"current/edits").isFile());
assertTrue(new File(baseDirs[i],"current/fsimage").isFile());
assertTrue(new File(baseDirs[i],"current/fstime").isFile());
}
break;
case DATA_NODE:
for (int i = 0; i < baseDirs.length; i++) {
assertEquals(
UpgradeUtilities.checksumContents(
nodeType, new File(baseDirs[i],"current")),
UpgradeUtilities.checksumMasterContents(nodeType));
}
break;
}
for (int i = 0; i < baseDirs.length; i++) {
assertFalse(new File(baseDirs[i],"previous").isDirectory());
}
}
/**
* Attempts to start a NameNode with the given operation. Starting
* the NameNode should throw an exception.
*/
void startNameNodeShouldFail(StartupOption operation) {
try {
cluster = new MiniDFSCluster(conf, 0, operation); // should fail
throw new AssertionError("NameNode should have failed to start");
} catch (Exception expected) {
// expected
}
}
/**
* Attempts to start a DataNode with the given operation. Starting
* the DataNode should throw an exception.
*/
void startDataNodeShouldFail(StartupOption operation) {
try {
cluster.startDataNodes(conf, 1, false, operation, null); // should fail
throw new AssertionError("DataNode should have failed to start");
} catch (Exception expected) {
// expected
assertFalse(cluster.isDataNodeUp());
}
}
/**
* This test attempts to rollback the NameNode and DataNode under
* a number of valid and invalid conditions.
*/
public void testRollback() throws Exception {
File[] baseDirs;
UpgradeUtilities.initialize();
for (int numDirs = 1; numDirs <= 2; numDirs++) {
conf = new HdfsConfiguration();
conf.setInt("dfs.datanode.scan.period.hours", -1);
conf = UpgradeUtilities.initializeStorageStateConf(numDirs, conf);
String[] nameNodeDirs = conf.getStrings(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY);
String[] dataNodeDirs = conf.getStrings(DFSConfigKeys.DFS_DATANODE_DATA_DIR_KEY);
log("Normal NameNode rollback", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
cluster = new MiniDFSCluster(conf, 0, StartupOption.ROLLBACK);
checkResult(NAME_NODE, nameNodeDirs);
cluster.shutdown();
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
log("Normal DataNode rollback", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
cluster = new MiniDFSCluster(conf, 0, StartupOption.ROLLBACK);
UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "current");
UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "previous");
cluster.startDataNodes(conf, 1, false, StartupOption.ROLLBACK, null);
checkResult(DATA_NODE, dataNodeDirs);
cluster.shutdown();
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
UpgradeUtilities.createEmptyDirs(dataNodeDirs);
log("NameNode rollback without existing previous dir", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
startNameNodeShouldFail(StartupOption.ROLLBACK);
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
log("DataNode rollback without existing previous dir", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
cluster = new MiniDFSCluster(conf, 0, StartupOption.UPGRADE);
UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "current");
cluster.startDataNodes(conf, 1, false, StartupOption.ROLLBACK, null);
cluster.shutdown();
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
UpgradeUtilities.createEmptyDirs(dataNodeDirs);
log("DataNode rollback with future stored layout version in previous", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
cluster = new MiniDFSCluster(conf, 0, StartupOption.ROLLBACK);
UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "previous");
UpgradeUtilities.createVersionFile(DATA_NODE, baseDirs,
new StorageInfo(Integer.MIN_VALUE,
UpgradeUtilities.getCurrentNamespaceID(cluster),
UpgradeUtilities.getCurrentFsscTime(cluster)));
startDataNodeShouldFail(StartupOption.ROLLBACK);
cluster.shutdown();
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
UpgradeUtilities.createEmptyDirs(dataNodeDirs);
log("DataNode rollback with newer fsscTime in previous", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
cluster = new MiniDFSCluster(conf, 0, StartupOption.ROLLBACK);
UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(DATA_NODE, dataNodeDirs, "previous");
UpgradeUtilities.createVersionFile(DATA_NODE, baseDirs,
new StorageInfo(UpgradeUtilities.getCurrentLayoutVersion(),
UpgradeUtilities.getCurrentNamespaceID(cluster),
Long.MAX_VALUE));
startDataNodeShouldFail(StartupOption.ROLLBACK);
cluster.shutdown();
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
UpgradeUtilities.createEmptyDirs(dataNodeDirs);
log("NameNode rollback with no edits file", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
for (File f : baseDirs) {
FileUtil.fullyDelete(new File(f,"edits"));
}
startNameNodeShouldFail(StartupOption.ROLLBACK);
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
log("NameNode rollback with no image file", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
for (File f : baseDirs) {
FileUtil.fullyDelete(new File(f,"fsimage"));
}
startNameNodeShouldFail(StartupOption.ROLLBACK);
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
log("NameNode rollback with corrupt version file", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
for (File f : baseDirs) {
UpgradeUtilities.corruptFile(new File(f,"VERSION"));
}
startNameNodeShouldFail(StartupOption.ROLLBACK);
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
log("NameNode rollback with old layout version in previous", numDirs);
UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "current");
baseDirs = UpgradeUtilities.createStorageDirs(NAME_NODE, nameNodeDirs, "previous");
UpgradeUtilities.createVersionFile(NAME_NODE, baseDirs,
new StorageInfo(1,
UpgradeUtilities.getCurrentNamespaceID(null),
UpgradeUtilities.getCurrentFsscTime(null)));
startNameNodeShouldFail(StartupOption.UPGRADE);
UpgradeUtilities.createEmptyDirs(nameNodeDirs);
} // end numDir loop
}
protected void tearDown() throws Exception {
LOG.info("Shutting down MiniDFSCluster");
if (cluster != null) cluster.shutdown();
}
public static void main(String[] args) throws Exception {
new TestDFSRollback().testRollback();
}
}