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/*
* 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.zookeeper.test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.PortAssignment;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZKTestCase;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.server.ServerCnxnFactory;
import org.apache.zookeeper.server.SyncRequestProcessor;
import org.apache.zookeeper.server.ZooKeeperServer;
import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
import org.junit.Test;
/** If snapshots are corrupted to the empty file or deleted, Zookeeper should
* not proceed to read its transactiong log files
* Test that zxid == -1 in the presence of emptied/deleted snapshots
*/
public class EmptiedSnapshotRecoveryTest extends ZKTestCase implements Watcher {
private static final Logger LOG = Logger.getLogger(RestoreCommittedLogTest.class);
private static String HOSTPORT = "127.0.0.1:" + PortAssignment.unique();
private static final int CONNECTION_TIMEOUT = 3000;
private static final int N_TRANSACTIONS = 150;
private static final int SNAP_COUNT = 100;
public void runTest(boolean leaveEmptyFile) throws Exception {
File tmpSnapDir = ClientBase.createTmpDir();
File tmpLogDir = ClientBase.createTmpDir();
ClientBase.setupTestEnv();
ZooKeeperServer zks = new ZooKeeperServer(tmpSnapDir, tmpLogDir, 3000);
SyncRequestProcessor.setSnapCount(SNAP_COUNT);
final int PORT = Integer.parseInt(HOSTPORT.split(":")[1]);
ServerCnxnFactory f = ServerCnxnFactory.createFactory(PORT, -1);
f.startup(zks);
assertTrue("waiting for server being up ", ClientBase.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT));
ZooKeeper zk = new ZooKeeper(HOSTPORT, CONNECTION_TIMEOUT, this);
try {
for (int i = 0; i < N_TRANSACTIONS; i++) {
zk.create("/node-" + i, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
} finally {
zk.close();
}
f.shutdown();
zks.shutdown();
assertTrue("waiting for server to shutdown", ClientBase.waitForServerDown(HOSTPORT, CONNECTION_TIMEOUT));
// start server again with intact database
zks = new ZooKeeperServer(tmpSnapDir, tmpLogDir, 3000);
zks.startdata();
long zxid = zks.getZKDatabase().getDataTreeLastProcessedZxid();
LOG.info("After clean restart, zxid = " + zxid);
assertTrue("zxid > 0", zxid > 0);
zks.shutdown();
// Make all snapshots empty
FileTxnSnapLog txnLogFactory = zks.getTxnLogFactory();
List<File> snapshots = txnLogFactory.findNRecentSnapshots(10);
assertTrue("We have a snapshot to corrupt", snapshots.size() > 0);
for (File file : snapshots) {
if (leaveEmptyFile) {
new PrintWriter(file).close();
} else {
file.delete();
}
}
// start server again with corrupted database
zks = new ZooKeeperServer(tmpSnapDir, tmpLogDir, 3000);
try {
zks.startdata();
zxid = zks.getZKDatabase().loadDataBase();
fail("Should have gotten exception for corrupted database");
} catch (IOException e) {
// expected behavior
}
zks.shutdown();
}
/**
* Test resilience to empty Snapshots
* @throws Exception an exception might be thrown here
*/
@Test
public void testRestoreWithEmptySnapFiles() throws Exception {
runTest(true);
}
/**
* Test resilience to deletion of Snapshots
* @throws Exception an exception might be thrown here
*/
@Test
public void testRestoreWithNoSnapFiles() throws Exception {
runTest(false);
}
public void process(WatchedEvent event) {
// do nothing
}
}
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