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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 org.apache.zookeeper.ZKTestCase;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.server.TraceFormatter;
import org.apache.zookeeper.server.ZKDatabase;
import org.apache.zookeeper.server.quorum.Leader.Proposal;
import org.apache.zookeeper.server.quorum.QuorumPeer;
import org.apache.zookeeper.test.ClientBase.CountdownWatcher;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Validate that open/close session request of a local session to not propagate
* to other machines in the quorum. We verify this by checking that
* these request doesn't show up in committedLog on other machines.
*/
public class LocalSessionRequestTest extends ZKTestCase {
protected static final Logger LOG = LoggerFactory
.getLogger(LocalSessionRequestTest.class);
// Need to be short since we need to wait for session to expire
public static final int CONNECTION_TIMEOUT = 4000;
private final QuorumBase qb = new QuorumBase();
@Before
public void setUp() throws Exception {
LOG.info("STARTING quorum " + getClass().getName());
qb.localSessionsEnabled = true;
qb.localSessionsUpgradingEnabled = true;
qb.setUp();
ClientBase.waitForServerUp(qb.hostPort, 10000);
}
@After
public void tearDown() throws Exception {
LOG.info("STOPPING quorum " + getClass().getName());
qb.tearDown();
}
@Test
public void testLocalSessionsOnFollower() throws Exception {
testOpenCloseSession(false);
}
@Test
public void testLocalSessionsOnLeader() throws Exception {
testOpenCloseSession(true);
}
/**
* Walk through the target peer commmittedLog.
* @param sessionId
* @param peerId
*/
private void validateRequestLog(long sessionId, int peerId) {
String session = Long.toHexString(sessionId);
LOG.info("Searching for txn of session 0x " + session +
" on peer " + peerId);
String peerType = peerId == qb.getLeaderIndex() ? "leader" : "follower";
QuorumPeer peer = qb.getPeerList().get(peerId);
ZKDatabase db = peer.getActiveServer().getZKDatabase();
for (Proposal p : db.getCommittedLog()) {
Assert.assertFalse("Should not see " +
TraceFormatter.op2String(p.request.type) +
" request from local session 0x" + session +
" on the " + peerType,
p.request.sessionId == sessionId);
}
}
/**
* Test that a CloseSession request generated by both the server (client
* disconnect) or by the client (client explicitly issue close()) doesn't
* get committed by the ensemble
*/
public void testOpenCloseSession(boolean onLeader) throws Exception {
int leaderIdx = qb.getLeaderIndex();
Assert.assertFalse("No leader in quorum?", leaderIdx == -1);
int followerIdx = (leaderIdx + 1) % 5;
int testPeerIdx = onLeader ? leaderIdx : followerIdx;
int verifyPeerIdx = onLeader ? followerIdx : leaderIdx;
String hostPorts[] = qb.hostPort.split(",");
CountdownWatcher watcher = new CountdownWatcher();
DisconnectableZooKeeper client = new DisconnectableZooKeeper(
hostPorts[testPeerIdx], CONNECTION_TIMEOUT, watcher);
watcher.waitForConnected(CONNECTION_TIMEOUT);
long localSessionId1 = client.getSessionId();
// Cut the connection, so the server will create closeSession as part
// of expiring the session.
client.dontReconnect();
client.disconnect();
watcher.reset();
// We don't validate right away, will do another session create first
ZooKeeper zk = qb.createClient(watcher, hostPorts[testPeerIdx],
CONNECTION_TIMEOUT);
watcher.waitForConnected(CONNECTION_TIMEOUT);
long localSessionId2 = zk.getSessionId();
// Send closeSession request.
zk.close();
watcher.reset();
// This should be enough time for the first session to expire and for
// the closeSession request to propagate to other machines (if there is a bug)
// Since it is time sensitive, we have false negative when test
// machine is under load
Thread.sleep(CONNECTION_TIMEOUT * 2);
// Validate that we don't see any txn from the first session
validateRequestLog(localSessionId1, verifyPeerIdx);
// Validate that we don't see any txn from the second session
validateRequestLog(localSessionId2, verifyPeerIdx);
qb.shutdownServers();
}
}
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