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From hanm <...@git.apache.org>
Subject [GitHub] zookeeper pull request #292: ZOOKEEPER-2819:Changing membership configuratio...
Date Fri, 30 Jun 2017 21:18:32 GMT
Github user hanm commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/292#discussion_r125132175
  
    --- Diff: src/java/test/org/apache/zookeeper/server/quorum/ReconfigRollingRestartCompatibilityTest.java
---
    @@ -0,0 +1,275 @@
    +/**
    + * 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.IOException;
    +import java.nio.charset.StandardCharsets;
    +import java.nio.file.Files;
    +import java.util.Arrays;
    +import java.util.Map;
    +import java.util.Set;
    +import java.util.List;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.ArrayList;
    +
    +import org.apache.zookeeper.WatchedEvent;
    +import org.apache.zookeeper.ZooKeeper;
    +import org.apache.zookeeper.CreateMode;
    +import org.apache.zookeeper.ZooDefs;
    +import org.apache.zookeeper.PortAssignment;
    +import org.apache.zookeeper.KeeperException;
    +import org.apache.zookeeper.Watcher;
    +import org.apache.zookeeper.test.ClientBase;
    +import org.junit.Assert;
    +import org.junit.Test;
    +
    +import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
    +
    +/**
    + * ReconfigRollingRestartCompatibilityTest - we want to make sure that users
    + * can continue using the rolling restart approach when reconfig feature is disabled.
    + * It is important to stay compatible with rolling restart because dynamic reconfig
    + * has its limitation: it requires a quorum of server to work. When no quorum can be
formed,
    + * rolling restart is the only approach to reconfigure the ensemble (e.g. removing bad
nodes
    + * such that a new quorum with smaller number of nodes can be formed.).
    + *
    + * See ZOOKEEPER-2819 for more details.
    + */
    +public class ReconfigRollingRestartCompatibilityTest extends QuorumPeerTestBase {
    +    private static final String backupFileName = "zoo.cfg.bak";
    +
    +    Map<Integer, Integer> clientPorts = new HashMap<>(5);
    +    Map<Integer, String> serverAddress = new HashMap<>(5);
    +
    +    private String generateNewQuorumConfig(int serverCount) {
    +        StringBuilder sb = new StringBuilder();
    +        String server;
    +        for (int i = 0; i < serverCount; i++) {
    +            clientPorts.put(i, PortAssignment.unique());
    +            server = "server." + i + "=localhost:" + PortAssignment.unique()
    +                    + ":" + PortAssignment.unique() + ":participant;localhost:"
    +                    + clientPorts.get(i);
    +            serverAddress.put(i, server);
    +            sb.append(server + "\n");
    +        }
    +        return sb.toString();
    +    }
    +
    +    private String updateExistingQuorumConfig(List<Integer> sidsToAdd, List<Integer>
sidsToRemove) {
    +        StringBuilder sb = new StringBuilder();
    +        for (Integer sid : sidsToAdd) {
    +            clientPorts.put(sid, PortAssignment.unique());
    +            serverAddress.put(sid, "server." + sid + "=localhost:" + PortAssignment.unique()
    +                    + ":" + PortAssignment.unique() + ":participant;localhost:"
    +                    + clientPorts.get(sid));
    +        }
    +
    +        for (Integer sid : sidsToRemove) {
    +            clientPorts.remove(sid);
    +            serverAddress.remove(sid);
    +        }
    +
    +        for (String server : serverAddress.values()) {
    +            sb.append(server + "\n");
    +        }
    +
    +        return sb.toString();
    +    }
    +
    +    @Test(timeout = 60000)
    +    // Verify no zoo.cfg.dynamic and zoo.cfg.bak files existing locally
    +    // when reconfig feature flag is off by default.
    +    public void testNoLocalDynamicConfigAndBackupFiles()
    +            throws InterruptedException, IOException {
    +        int serverCount = 3;
    +        String config = generateNewQuorumConfig(serverCount);
    +        QuorumPeerTestBase.MainThread mt[] = new QuorumPeerTestBase.MainThread[serverCount];
    +        String[] staticFileContent = new String[serverCount];
    +
    +        for (int i = 0; i < serverCount; i++) {
    +            mt[i] = new QuorumPeerTestBase.MainThread(i, clientPorts.get(i),
    +                    config, false);
    +            mt[i].start();
    +        }
    +
    +        for (int i = 0; i < serverCount; i++) {
    +            Assert.assertTrue("waiting for server " + i + " being up",
    +                    ClientBase.waitForServerUp("127.0.0.1:" + clientPorts.get(i),
    +                            CONNECTION_TIMEOUT));
    +            Assert.assertNull("static file backup (zoo.cfg.bak) shouldn't exist!",
    +                    mt[i].getFileByName(backupFileName));
    +            Assert.assertNull("dynamic configuration file (zoo.cfg.dynamic.*) shouldn't
exist!",
    +                    mt[i].getFileByName(mt[i].getQuorumPeer().getNextDynamicConfigFilename()));
    +            staticFileContent[i] = Files.readAllLines(mt[i].confFile.toPath(), StandardCharsets.UTF_8).toString();
    +            Assert.assertTrue("static config file should contain server entry " + serverAddress.get(i),
    +                    staticFileContent[i].contains(serverAddress.get(i)));
    +        }
    +
    +        for (int i = 0; i < serverCount; i++) {
    +            mt[i].shutdown();
    +        }
    +    }
    +
    +    @Test(timeout = 60000)
    +    // This test simulate the usual rolling restart with no membership change:
    +    // 1. A node is shutdown first (e.g. to upgrade software, or hardware, or cleanup
local data.).
    +    // 2. After upgrade, start the node.
    +    // 3. Do this for every node, one at a time.
    +    public void testRollingRestartWithoutMembershipChange()
    +            throws IOException, InterruptedException, KeeperException {
    +        int serverCount = 3;
    +        String config = generateNewQuorumConfig(serverCount);
    +        QuorumPeerTestBase.MainThread mt[] = new QuorumPeerTestBase.MainThread[serverCount];
    +        for (int i = 0; i < serverCount; ++i) {
    +            mt[i] = new QuorumPeerTestBase.MainThread(i, clientPorts.get(i),
    +                    config, false);
    +            mt[i].start();
    +        }
    +
    +        for (int i = 0; i < serverCount; ++i) {
    +            Assert.assertTrue("waiting for server " + i + " being up",
    +                    ClientBase.waitForServerUp("127.0.0.1:" + clientPorts.get(i),
    +                            CONNECTION_TIMEOUT));
    +        }
    +
    +        for (int i = 0; i < serverCount; ++i) {
    +            mt[i].shutdown();
    +            mt[i].start();
    +            verifyQuorum(i);
    +            verifyConfig(mt[i]);
    +        }
    +
    +        for (int i = 0; i < serverCount; i++) {
    +            mt[i].shutdown();
    +        }
    +    }
    +
    +    @Test(timeout = 90000)
    +    // This test simulate the use case of change of membership through rolling
    +    // restart. For a 3 node ensemble we expand it to a 5 node ensemble, verify
    +    // during the process each node has the expected configuration setting pushed
    +    // via updating local zoo.cfg file.
    +    public void testRollingRestartWithMembershipChange()
    +            throws IOException, InterruptedException, KeeperException {
    +        int serverCount = 3;
    +        String config = generateNewQuorumConfig(serverCount);
    +        QuorumPeerTestBase.MainThread mt[] = new QuorumPeerTestBase.MainThread[serverCount];
    +        for (int i = 0; i < serverCount; ++i) {
    +            mt[i] = new QuorumPeerTestBase.MainThread(i, clientPorts.get(i),
    +                    config, false);
    +            mt[i].start();
    +        }
    +
    +        for (int i = 0; i < serverCount; ++i) {
    +            Assert.assertTrue("waiting for server " + i + " being up",
    +                    ClientBase.waitForServerUp("127.0.0.1:" + clientPorts.get(i),
    +                            CONNECTION_TIMEOUT));
    +        }
    +
    +        for (int i = 0; i < serverCount; ++i) {
    +            verifyQuorum(i);
    +            verifyConfig(mt[i]);
    +        }
    +
    +        Map<Integer, String> oldServerAddress = new HashMap<>(serverAddress);
    +        config = updateExistingQuorumConfig(Arrays.asList(3, 4), new ArrayList<Integer>());
    +        serverCount = serverAddress.size();
    +        Assert.assertEquals("Server count should be 5 after config update.", serverCount,
5);
    +
    +        mt = Arrays.copyOf(mt, mt.length + 2);
    +        for (int i = 3; i < 5; ++i) {
    +            mt[i] = new QuorumPeerTestBase.MainThread(i, clientPorts.get(i),
    +                    config, false);
    +            mt[i].start();
    +            Assert.assertTrue("waiting for server " + i + " being up",
    +                    ClientBase.waitForServerUp("127.0.0.1:" + clientPorts.get(i),
    +                            CONNECTION_TIMEOUT));
    +            verifyConfig(mt[i]);
    +            verifyQuorum(i);
    +        }
    +
    +        Set<String> expectedConfigs = new HashSet<>();
    +        for (String conf : oldServerAddress.values()) {
    +            // Remove "server.x=" prefix.
    +            expectedConfigs.add(conf.substring(9));
    +        }
    +
    +        for (int i = 0; i < 3; ++i) {
    +            verifyConfig(mt[i], expectedConfigs);
    +        }
    +
    +        for (int i = 0; i < serverCount; ++i) {
    +            mt[i].shutdown();
    +        }
    +    }
    +
    +    // A successful write operation indicates a quorum is up.
    +    private void verifyQuorum(int sid)
    +            throws IOException, InterruptedException, KeeperException {
    +        ZooKeeper zk = new ZooKeeper("127.0.0.1:" + clientPorts.get(sid),
    +                ClientBase.CONNECTION_TIMEOUT, new Watcher() {
    +            public void process(WatchedEvent event) {
    +            }});
    +
    +        for (int j = 0; j < 30; j++) {
    +            try {
    +                zk.create("/" + Integer.toString(sid) + "." + Math.random(),
    +                        "foobar".getBytes(),
    +                        ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    +                break;
    +            } catch (KeeperException.ConnectionLossException e) {
    +                if (j < 29) {
    +                    Thread.sleep(1000);
    +                } else {
    +                    Assert.fail("client could not connect to reestablished quorum: "
+
    +                            "giving up after 30+ seconds.");
    +                }
    +            }
    +        }
    +    }
    +
    +    private void verifyConfig(QuorumPeerTestBase.MainThread mt) {
    +        Set<String> expectedConfigs = new HashSet<>();
    +        for (String config : serverAddress.values()) {
    +            // Remove "server.x=" prefix.
    +            expectedConfigs.add(config.substring(9));
    --- End diff --
    
    With the ReconfigTest helpers I can remove these code, hopefully.


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