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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.server.quorum;
import java.io.File;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.apache.zookeeper.PortAssignment;
import org.apache.zookeeper.ZKTestCase;
import org.apache.zookeeper.server.quorum.FastLeaderElection.Notification;
import org.apache.zookeeper.server.quorum.FastLeaderElection.ToSend;
import org.apache.zookeeper.server.quorum.FastLeaderElection.Messenger.WorkerReceiver;
import org.apache.zookeeper.server.quorum.QuorumCnxManager.Message;
import org.apache.zookeeper.server.quorum.QuorumPeer.QuorumServer;
import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState;
import org.apache.zookeeper.server.util.ZxidUtils;
import org.apache.zookeeper.test.ClientBase;
import org.apache.zookeeper.test.FLETest;
import org.apache.zookeeper.test.QuorumBase;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FLECompatibilityTest extends ZKTestCase {
protected static final Logger LOG = LoggerFactory.getLogger(FLECompatibilityTest.class);
int count;
HashMap<Long,QuorumServer> peers;
File tmpdir[];
int port[];
@Before
public void setUp() throws Exception {
count = 3;
peers = new HashMap<Long,QuorumServer>(count);
tmpdir = new File[count];
port = new int[count];
}
@After
public void tearDown() throws Exception {
}
class MockFLEMessengerBackward {
QuorumCnxManager manager;
QuorumPeer self;
long logicalclock = 1L;
LinkedBlockingQueue<ToSend> sendqueue = new LinkedBlockingQueue<ToSend>();
LinkedBlockingQueue<ToSend> internalqueue = new LinkedBlockingQueue<ToSend>();
LinkedBlockingQueue<Notification> recvqueue = new LinkedBlockingQueue<Notification>();
WorkerReceiver wr;
MockFLEMessengerBackward(QuorumPeer self, QuorumCnxManager manager){
this.manager = manager;
this.self = self;
this.wr = new WorkerReceiver(manager);
Thread t = new Thread(this.wr,
"WorkerReceiver[myid=" + self.getId() + "]");
t.setDaemon(true);
t.start();
}
void halt() {
wr.stop = true;
}
/*
* This class has been copied from before adding versions to notifications.
*
* {@see https://issues.apache.org/jira/browse/ZOOKEEPER-1808}
*/
class WorkerReceiver implements Runnable {
volatile boolean stop;
QuorumCnxManager manager;
final long proposedLeader = 2;
final long proposedZxid = 0x1;
final long proposedEpoch = 1;
WorkerReceiver(QuorumCnxManager manager) {
this.stop = false;
this.manager = manager;
}
/*
* The vote we return here is fixed for test purposes.
*/
Vote getVote(){
return new Vote(proposedLeader, proposedZxid, proposedEpoch);
}
public void run() {
Message response;
while (!stop) {
// Sleeps on receive
try{
response = manager.pollRecvQueue(3000, TimeUnit.MILLISECONDS);
if(response == null) continue;
/*
* If it is from an observer, respond right away.
* Note that the following predicate assumes that
* if a server is not a follower, then it must be
* an observer. If we ever have any other type of
* learner in the future, we'll have to change the
* way we check for observers.
*/
if(!self.getVotingView().containsKey(response.sid)){
Vote current = self.getCurrentVote();
ToSend notmsg = new ToSend(ToSend.mType.notification,
current.getId(),
current.getZxid(),
logicalclock,
self.getPeerState(),
response.sid,
current.getPeerEpoch());
internalqueue.offer(notmsg);
} else {
// Receive new message
if (LOG.isDebugEnabled()) {
LOG.debug("Receive new notification message. My id = "
+ self.getId());
}
/*
* We check for 28 bytes for backward compatibility
*/
if (response.buffer.capacity() < 28) {
LOG.error("Got a short response: "
+ response.buffer.capacity());
continue;
}
boolean backCompatibility = (response.buffer.capacity() == 28);
response.buffer.clear();
// State of peer that sent this message
QuorumPeer.ServerState ackstate = QuorumPeer.ServerState.LOOKING;
switch (response.buffer.getInt()) {
case 0:
ackstate = QuorumPeer.ServerState.LOOKING;
break;
case 1:
ackstate = QuorumPeer.ServerState.FOLLOWING;
break;
case 2:
ackstate = QuorumPeer.ServerState.LEADING;
break;
case 3:
ackstate = QuorumPeer.ServerState.OBSERVING;
break;
}
// Instantiate Notification and set its attributes
Notification n = new Notification();
n.leader = response.buffer.getLong();
n.zxid = response.buffer.getLong();
n.electionEpoch = response.buffer.getLong();
n.state = ackstate;
n.sid = response.sid;
if(!backCompatibility){
n.peerEpoch = response.buffer.getLong();
} else {
if(LOG.isInfoEnabled()){
LOG.info("Backward compatibility mode, server id=" + n.sid);
}
n.peerEpoch = ZxidUtils.getEpochFromZxid(n.zxid);
}
/*
* If this server is looking, then send proposed leader
*/
if(self.getPeerState() == QuorumPeer.ServerState.LOOKING){
recvqueue.offer(n);
/*
* Send a notification back if the peer that sent this
* message is also looking and its logical clock is
* lagging behind.
*/
if((ackstate == QuorumPeer.ServerState.LOOKING)
&& (n.electionEpoch < logicalclock)){
Vote v = getVote();
ToSend notmsg = new ToSend(ToSend.mType.notification,
v.getId(),
v.getZxid(),
logicalclock,
self.getPeerState(),
response.sid,
v.getPeerEpoch());
internalqueue.offer(notmsg);
}
} else {
/*
* If this server is not looking, but the one that sent the ack
* is looking, then send back what it believes to be the leader.
*/
Vote current = self.getCurrentVote();
if(ackstate == QuorumPeer.ServerState.LOOKING){
if(LOG.isDebugEnabled()){
LOG.debug("Sending new notification. My id = " +
self.getId() + " recipient=" +
response.sid + " zxid=0x" +
Long.toHexString(current.getZxid()) +
" leader=" + current.getId());
}
ToSend notmsg = new ToSend(
ToSend.mType.notification,
current.getId(),
current.getZxid(),
current.getElectionEpoch(),
self.getPeerState(),
response.sid,
current.getPeerEpoch());
internalqueue.offer(notmsg);
}
}
}
} catch (InterruptedException e) {
System.out.println("Interrupted Exception while waiting for new message" +
e.toString());
}
}
LOG.info("WorkerReceiver is down");
}
}
}
class MockFLEMessengerForward extends FastLeaderElection {
MockFLEMessengerForward(QuorumPeer self, QuorumCnxManager manager){
super( self, manager );
}
void halt() {
super.shutdown();
}
}
void populate()
throws Exception {
for (int i = 0; i < count; i++) {
peers.put(Long.valueOf(i),
new QuorumServer(i, "0.0.0.0",
PortAssignment.unique(),
PortAssignment.unique(), null));
tmpdir[i] = ClientBase.createTmpDir();
port[i] = PortAssignment.unique();
}
}
@Test(timeout=20000)
public void testBackwardCompatibility()
throws Exception {
populate();
QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 1000, 2, 2);
peer.setPeerState(ServerState.LOOKING);
QuorumCnxManager mng = peer.createCnxnManager();
/*
* Check that it generates an internal notification correctly
*/
MockFLEMessengerBackward fle = new MockFLEMessengerBackward(peer, mng);
ByteBuffer buffer = FastLeaderElection.buildMsg(ServerState.LOOKING.ordinal(), 2, 0x1, 1, 1);
fle.manager.recvQueue.add(new Message(buffer, 2));
Notification n = fle.recvqueue.take();
Assert.assertTrue("Wrong state", n.state == ServerState.LOOKING);
Assert.assertTrue("Wrong leader", n.leader == 2);
Assert.assertTrue("Wrong zxid", n.zxid == 0x1);
Assert.assertTrue("Wrong epoch", n.electionEpoch == 1);
Assert.assertTrue("Wrong epoch", n.peerEpoch == 1);
/*
* Check that it sends a notification back to the sender
*/
peer.setPeerState(ServerState.FOLLOWING);
peer.setCurrentVote( new Vote(2, 0x1, 1, 1, ServerState.LOOKING) );
buffer = FastLeaderElection.buildMsg(ServerState.LOOKING.ordinal(), 1, 0x1, 1, 1);
fle.manager.recvQueue.add(new Message(buffer, 1));
ToSend m = fle.internalqueue.take();
Assert.assertTrue("Wrong state", m.state == ServerState.FOLLOWING);
Assert.assertTrue("Wrong sid", m.sid == 1);
Assert.assertTrue("Wrong leader", m.leader == 2);
Assert.assertTrue("Wrong epoch", m.electionEpoch == 1);
Assert.assertTrue("Wrong epoch", m.peerEpoch == 1);
}
@Test(timeout=20000)
public void testForwardCompatibility()
throws Exception {
populate();
QuorumPeer peer = new QuorumPeer(peers, tmpdir[0], tmpdir[0], port[0], 3, 0, 1000, 2, 2);
peer.setPeerState(ServerState.LOOKING);
QuorumCnxManager mng = peer.createCnxnManager();
/*
* Check that it generates an internal notification correctly
*/
MockFLEMessengerForward fle = new MockFLEMessengerForward(peer, mng);
ByteBuffer notBuffer = FastLeaderElection.buildMsg(ServerState.LOOKING.ordinal(), 2, 0x1, 1, 1);
ByteBuffer buffer = ByteBuffer.allocate( notBuffer.capacity() + 8 );
notBuffer.flip();
buffer.put(notBuffer);
buffer.putLong( Long.MAX_VALUE );
buffer.flip();
fle.manager.recvQueue.add(new Message(buffer, 2));
Notification n = fle.recvqueue.take();
Assert.assertTrue("Wrong state", n.state == ServerState.LOOKING);
Assert.assertTrue("Wrong leader", n.leader == 2);
Assert.assertTrue("Wrong zxid", n.zxid == 0x1);
Assert.assertTrue("Wrong epoch", n.electionEpoch == 1);
Assert.assertTrue("Wrong epoch", n.peerEpoch == 1);
Assert.assertTrue("Wrong version", n.version == FastLeaderElection.Notification.CURRENTVERSION);
}
}
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