/**
* 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;
/**
* This is a simple test to check the integrity of ZooKeeper servers. The client
* simply cycles through blasting changes to ZooKeeper and the checking what it
* gets back.
*
* The check is very simple. The value of the last successful read or write is
* stored in lastValue. When we issue a request, that value becomes a possible
* value. The difficulty is that when a communication error happens, the client
* doesn't know if the set actually went through. So, our invariant that we
* check for is that we always read a value that is greater than or equal to
* a value that we have previously read or set. (Each time we set a value, the
* value will be one more than the previous set.)
*/
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.AsyncCallback.DataCallback;
import org.apache.zookeeper.AsyncCallback.StatCallback;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.data.Stat;
public class IntegrityCheck implements Watcher, StatCallback, DataCallback {
private static final Logger LOG = LoggerFactory.getLogger(IntegrityCheck.class);
ZooKeeper zk;
HashMap<String, byte[]> lastValue = new HashMap<String, byte[]>();
int count;
String path;
int iteration;
int outstanding;
int errorCount;
synchronized void incOutstanding() {
outstanding++;
}
synchronized void decOutstanding() {
outstanding--;
notifyAll();
}
synchronized void waitOutstanding() throws InterruptedException {
while (outstanding > 0) {
wait();
}
}
IntegrityCheck(String hostPort, String path, int count) throws
IOException {
zk = new ZooKeeper(hostPort, 30000, this);
this.path = path;
this.count = count;
}
public void run() throws InterruptedException, KeeperException {
try{
LOG.warn("Creating znodes for "+path);
doCreate();
LOG.warn("Staring the test loop for "+path);
while (true) {
LOG.warn("Staring write cycle for "+path);
doPopulate();
waitOutstanding();
LOG.warn("Staring read cycle for "+path);
readAll();
waitOutstanding();
}
}finally{
LOG.warn("Test loop terminated for "+path);
}
}
void readAll() {
for (int i = 0; i < count; i++) {
String cpath = path + "/" + i;
zk.getData(cpath, false, this, null);
incOutstanding();
}
}
void doCreate() throws InterruptedException, KeeperException {
// create top level znode
try{
zk.create(path, null, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}catch(KeeperException.NodeExistsException e){
// ignore duplicate create
}
iteration++;
byte v[] = ("" + iteration).getBytes();
// create child znodes
for (int i = 0; i < count; i++) {
String cpath = path + "/" + i;
try{
if(i%10==0)
LOG.warn("Creating znode "+cpath);
zk.create(cpath, v, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}catch(KeeperException.NodeExistsException e){
// ignore duplicate create
}
lastValue.put(cpath, v);
}
}
void doPopulate() {
iteration++;
byte v[] = ("" + iteration).getBytes();
for (int i = 0; i < count; i++) {
String cpath = path + "/" + i;
zk.setData(cpath, v, -1, this, v);
incOutstanding();
}
}
// watcher callback
public void process(WatchedEvent event) {
if(event.getState()==KeeperState.SyncConnected){
synchronized(this){
notifyAll();
}
}
}
synchronized void ensureConnected(){
while(zk.getState()!=ZooKeeper.States.CONNECTED){
try {
wait();
} catch (InterruptedException e) {
return;
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
if (args.length < 3) {
System.err.println("USAGE: IntegrityCheck zookeeperHostPort znode #children");
return;
}
int childrenCount=0;
try {
childrenCount=Integer.parseInt(args[2]);
} catch (NumberFormatException e) {
e.printStackTrace();
System.exit(1);
}
try{
final IntegrityCheck ctest = new IntegrityCheck(args[0], args[1],childrenCount);
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
System.out.println(new Date().toString()+": Error count = " + ctest.errorCount);
}
});
while(true){
try{
ctest.ensureConnected();
ctest.run();
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
System.exit(2);
}
}
public void processResult(int rc, String path, Object ctx, Stat stat) {
if (rc == 0) {
lastValue.put(path, (byte[]) ctx);
}
decOutstanding();
}
public void processResult(int rc, String path, Object ctx, byte[] data,
Stat stat) {
if (rc == 0) {
String string = new String(data);
String lastString = null;
byte[] v = lastValue.get(path);
if (v != null) {
lastString = new String(v);
}
if (lastString != null
&& Integer.parseInt(string) < Integer.parseInt(lastString)) {
LOG.error("ERROR: Got " + string + " expected >= "
+ lastString);
errorCount++;
}
lastValue.put(path, (byte[]) ctx);
}
decOutstanding();
}
}