Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2016-present Open Networking Foundation |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.store.primitives.resources.impl; |
| 17 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 18 | import java.util.Arrays; |
| 19 | import java.util.HashMap; |
| 20 | import java.util.LinkedHashMap; |
| 21 | import java.util.LinkedList; |
| 22 | import java.util.List; |
| 23 | import java.util.Map; |
| 24 | import java.util.Optional; |
| 25 | import java.util.Set; |
| 26 | import java.util.concurrent.atomic.AtomicLong; |
| 27 | import java.util.function.Supplier; |
| 28 | import java.util.stream.Collectors; |
| 29 | |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 30 | import com.google.common.base.MoreObjects; |
| 31 | import com.google.common.base.Objects; |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 32 | import com.google.common.collect.ImmutableSet; |
| 33 | import com.google.common.collect.Lists; |
| 34 | import com.google.common.collect.Maps; |
| 35 | import com.google.common.collect.Sets; |
| 36 | import io.atomix.protocols.raft.service.AbstractRaftService; |
| 37 | import io.atomix.protocols.raft.service.Commit; |
| 38 | import io.atomix.protocols.raft.service.RaftServiceExecutor; |
| 39 | import io.atomix.protocols.raft.session.RaftSession; |
| 40 | import io.atomix.protocols.raft.storage.snapshot.SnapshotReader; |
| 41 | import io.atomix.protocols.raft.storage.snapshot.SnapshotWriter; |
| 42 | import org.onlab.util.KryoNamespace; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 43 | import org.onosproject.cluster.Leader; |
| 44 | import org.onosproject.cluster.Leadership; |
| 45 | import org.onosproject.cluster.NodeId; |
| 46 | import org.onosproject.event.Change; |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 47 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Anoint; |
| 48 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Evict; |
| 49 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GetElectedTopics; |
| 50 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GetLeadership; |
| 51 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Promote; |
| 52 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Run; |
| 53 | import org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.Withdraw; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 54 | import org.onosproject.store.service.Serializer; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 55 | |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 56 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorEvents.CHANGE; |
| 57 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.ADD_LISTENER; |
| 58 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.ANOINT; |
| 59 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.EVICT; |
| 60 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_ALL_LEADERSHIPS; |
| 61 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_ELECTED_TOPICS; |
| 62 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.GET_LEADERSHIP; |
| 63 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.PROMOTE; |
| 64 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.REMOVE_LISTENER; |
| 65 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.RUN; |
| 66 | import static org.onosproject.store.primitives.resources.impl.AtomixLeaderElectorOperations.WITHDRAW; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 67 | |
| 68 | /** |
| 69 | * State machine for {@link AtomixLeaderElector} resource. |
| 70 | */ |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 71 | public class AtomixLeaderElectorService extends AbstractRaftService { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 72 | |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 73 | private static final Serializer SERIALIZER = Serializer.using(KryoNamespace.newBuilder() |
| 74 | .register(AtomixLeaderElectorOperations.NAMESPACE) |
| 75 | .register(AtomixLeaderElectorEvents.NAMESPACE) |
| 76 | .register(ElectionState.class) |
| 77 | .register(Registration.class) |
| 78 | .register(new LinkedHashMap<>().keySet().getClass()) |
| 79 | .build()); |
| 80 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 81 | private Map<String, AtomicLong> termCounters = new HashMap<>(); |
| 82 | private Map<String, ElectionState> elections = new HashMap<>(); |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 83 | private Map<Long, RaftSession> listeners = new LinkedHashMap<>(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 84 | |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 85 | @Override |
| 86 | public void snapshot(SnapshotWriter writer) { |
| 87 | writer.writeObject(Sets.newHashSet(listeners.keySet()), SERIALIZER::encode); |
| 88 | writer.writeObject(termCounters, SERIALIZER::encode); |
| 89 | writer.writeObject(elections, SERIALIZER::encode); |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 90 | logger().debug("Took state machine snapshot"); |
Madan Jampani | 86cb243 | 2016-02-17 11:07:56 -0800 | [diff] [blame] | 91 | } |
| 92 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 93 | @Override |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 94 | public void install(SnapshotReader reader) { |
| 95 | listeners = new LinkedHashMap<>(); |
| 96 | for (Long sessionId : reader.<Set<Long>>readObject(SERIALIZER::decode)) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 97 | listeners.put(sessionId, sessions().getSession(sessionId)); |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 98 | } |
| 99 | termCounters = reader.readObject(SERIALIZER::decode); |
| 100 | elections = reader.readObject(SERIALIZER::decode); |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 101 | logger().debug("Reinstated state machine from snapshot"); |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | @Override |
| 105 | protected void configure(RaftServiceExecutor executor) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 106 | // Notification |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 107 | executor.register(ADD_LISTENER, this::listen); |
| 108 | executor.register(REMOVE_LISTENER, this::unlisten); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 109 | // Commands |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 110 | executor.register(RUN, SERIALIZER::decode, this::run, SERIALIZER::encode); |
| 111 | executor.register(WITHDRAW, SERIALIZER::decode, this::withdraw); |
| 112 | executor.register(ANOINT, SERIALIZER::decode, this::anoint, SERIALIZER::encode); |
| 113 | executor.register(PROMOTE, SERIALIZER::decode, this::promote, SERIALIZER::encode); |
| 114 | executor.register(EVICT, SERIALIZER::decode, this::evict); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 115 | // Queries |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 116 | executor.register(GET_LEADERSHIP, SERIALIZER::decode, this::getLeadership, SERIALIZER::encode); |
| 117 | executor.register(GET_ALL_LEADERSHIPS, this::allLeaderships, SERIALIZER::encode); |
| 118 | executor.register(GET_ELECTED_TOPICS, SERIALIZER::decode, this::electedTopics, SERIALIZER::encode); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | private void notifyLeadershipChange(Leadership previousLeadership, Leadership newLeadership) { |
Madan Jampani | db2afd3 | 2016-02-23 16:26:45 -0800 | [diff] [blame] | 122 | notifyLeadershipChanges(Lists.newArrayList(new Change<>(previousLeadership, newLeadership))); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | private void notifyLeadershipChanges(List<Change<Leadership>> changes) { |
| 126 | if (changes.isEmpty()) { |
| 127 | return; |
| 128 | } |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 129 | listeners.values().forEach(session -> session.publish(CHANGE, SERIALIZER::encode, changes)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Applies listen commits. |
| 134 | * |
| 135 | * @param commit listen commit |
| 136 | */ |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 137 | public void listen(Commit<Void> commit) { |
| 138 | listeners.put(commit.session().sessionId().id(), commit.session()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Applies unlisten commits. |
| 143 | * |
| 144 | * @param commit unlisten commit |
| 145 | */ |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 146 | public void unlisten(Commit<Void> commit) { |
| 147 | listeners.remove(commit.session().sessionId().id()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 151 | * Applies an {@link AtomixLeaderElectorOperations.Run} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 152 | * @param commit commit entry |
| 153 | * @return topic leader. If no previous leader existed this is the node that just entered the race. |
| 154 | */ |
Madan Jampani | fc98177 | 2016-02-16 09:46:42 -0800 | [diff] [blame] | 155 | public Leadership run(Commit<? extends Run> commit) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 156 | try { |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 157 | String topic = commit.value().topic(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 158 | Leadership oldLeadership = leadership(topic); |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 159 | Registration registration = new Registration(commit.value().nodeId(), commit.session().sessionId().id()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 160 | elections.compute(topic, (k, v) -> { |
| 161 | if (v == null) { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 162 | return new ElectionState(registration, termCounter(topic)::incrementAndGet); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 163 | } else { |
| 164 | if (!v.isDuplicate(registration)) { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 165 | return new ElectionState(v).addRegistration(registration, termCounter(topic)::incrementAndGet); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 166 | } else { |
| 167 | return v; |
| 168 | } |
| 169 | } |
| 170 | }); |
| 171 | Leadership newLeadership = leadership(topic); |
| 172 | |
| 173 | if (!Objects.equal(oldLeadership, newLeadership)) { |
| 174 | notifyLeadershipChange(oldLeadership, newLeadership); |
| 175 | } |
| 176 | return newLeadership; |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 177 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 178 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 179 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 180 | } |
| 181 | } |
| 182 | |
| 183 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 184 | * Applies an {@link AtomixLeaderElectorOperations.Withdraw} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 185 | * @param commit withdraw commit |
| 186 | */ |
Madan Jampani | fc98177 | 2016-02-16 09:46:42 -0800 | [diff] [blame] | 187 | public void withdraw(Commit<? extends Withdraw> commit) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 188 | try { |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 189 | String topic = commit.value().topic(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 190 | Leadership oldLeadership = leadership(topic); |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 191 | elections.computeIfPresent(topic, (k, v) -> v.cleanup(commit.session(), |
| 192 | termCounter(topic)::incrementAndGet)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 193 | Leadership newLeadership = leadership(topic); |
| 194 | if (!Objects.equal(oldLeadership, newLeadership)) { |
| 195 | notifyLeadershipChange(oldLeadership, newLeadership); |
| 196 | } |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 197 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 198 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 199 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 200 | } |
| 201 | } |
| 202 | |
| 203 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 204 | * Applies an {@link AtomixLeaderElectorOperations.Anoint} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 205 | * @param commit anoint commit |
| 206 | * @return {@code true} if changes were made and the transfer occurred; {@code false} if it did not. |
| 207 | */ |
Madan Jampani | fc98177 | 2016-02-16 09:46:42 -0800 | [diff] [blame] | 208 | public boolean anoint(Commit<? extends Anoint> commit) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 209 | try { |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 210 | String topic = commit.value().topic(); |
| 211 | NodeId nodeId = commit.value().nodeId(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 212 | Leadership oldLeadership = leadership(topic); |
| 213 | ElectionState electionState = elections.computeIfPresent(topic, |
Madan Jampani | c94b485 | 2016-02-23 18:18:37 -0800 | [diff] [blame] | 214 | (k, v) -> v.transferLeadership(nodeId, termCounter(topic))); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 215 | Leadership newLeadership = leadership(topic); |
| 216 | if (!Objects.equal(oldLeadership, newLeadership)) { |
| 217 | notifyLeadershipChange(oldLeadership, newLeadership); |
| 218 | } |
| 219 | return (electionState != null && |
| 220 | electionState.leader() != null && |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 221 | commit.value().nodeId().equals(electionState.leader().nodeId())); |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 222 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 223 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 224 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 225 | } |
| 226 | } |
| 227 | |
| 228 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 229 | * Applies an {@link AtomixLeaderElectorOperations.Promote} commit. |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 230 | * @param commit promote commit |
| 231 | * @return {@code true} if changes desired end state is achieved. |
| 232 | */ |
| 233 | public boolean promote(Commit<? extends Promote> commit) { |
| 234 | try { |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 235 | String topic = commit.value().topic(); |
| 236 | NodeId nodeId = commit.value().nodeId(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 237 | Leadership oldLeadership = leadership(topic); |
| 238 | if (oldLeadership == null || !oldLeadership.candidates().contains(nodeId)) { |
| 239 | return false; |
| 240 | } |
Madan Jampani | c94b485 | 2016-02-23 18:18:37 -0800 | [diff] [blame] | 241 | elections.computeIfPresent(topic, (k, v) -> v.promote(nodeId)); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 242 | Leadership newLeadership = leadership(topic); |
| 243 | if (!Objects.equal(oldLeadership, newLeadership)) { |
| 244 | notifyLeadershipChange(oldLeadership, newLeadership); |
| 245 | } |
| 246 | return true; |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 247 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 248 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 249 | throw new IllegalStateException(e); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 250 | } |
| 251 | } |
| 252 | |
| 253 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 254 | * Applies an {@link AtomixLeaderElectorOperations.Evict} commit. |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 255 | * @param commit evict commit |
| 256 | */ |
| 257 | public void evict(Commit<? extends Evict> commit) { |
| 258 | try { |
Madan Jampani | db2afd3 | 2016-02-23 16:26:45 -0800 | [diff] [blame] | 259 | List<Change<Leadership>> changes = Lists.newArrayList(); |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 260 | NodeId nodeId = commit.value().nodeId(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 261 | Set<String> topics = Maps.filterValues(elections, e -> e.candidates().contains(nodeId)).keySet(); |
| 262 | topics.forEach(topic -> { |
| 263 | Leadership oldLeadership = leadership(topic); |
| 264 | elections.compute(topic, (k, v) -> v.evict(nodeId, termCounter(topic)::incrementAndGet)); |
| 265 | Leadership newLeadership = leadership(topic); |
| 266 | if (!Objects.equal(oldLeadership, newLeadership)) { |
| 267 | changes.add(new Change<>(oldLeadership, newLeadership)); |
| 268 | } |
| 269 | }); |
| 270 | notifyLeadershipChanges(changes); |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 271 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 272 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 273 | throw new IllegalStateException(e); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 274 | } |
| 275 | } |
| 276 | |
| 277 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 278 | * Applies an {@link AtomixLeaderElectorOperations.GetLeadership} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 279 | * @param commit GetLeadership commit |
| 280 | * @return leader |
| 281 | */ |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 282 | public Leadership getLeadership(Commit<? extends GetLeadership> commit) { |
| 283 | String topic = commit.value().topic(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 284 | try { |
| 285 | return leadership(topic); |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 286 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 287 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 288 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 289 | } |
| 290 | } |
| 291 | |
| 292 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 293 | * Applies an {@link AtomixLeaderElectorOperations.GetElectedTopics} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 294 | * @param commit commit entry |
| 295 | * @return set of topics for which the node is the leader |
| 296 | */ |
Madan Jampani | fc98177 | 2016-02-16 09:46:42 -0800 | [diff] [blame] | 297 | public Set<String> electedTopics(Commit<? extends GetElectedTopics> commit) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 298 | try { |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 299 | NodeId nodeId = commit.value().nodeId(); |
Aaron Kruglikov | c0c27c0 | 2016-06-07 16:05:00 -0700 | [diff] [blame] | 300 | return ImmutableSet.copyOf(Maps.filterEntries(elections, e -> { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 301 | Leader leader = leadership(e.getKey()).leader(); |
| 302 | return leader != null && leader.nodeId().equals(nodeId); |
Aaron Kruglikov | c0c27c0 | 2016-06-07 16:05:00 -0700 | [diff] [blame] | 303 | }).keySet()); |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 304 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 305 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 306 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 307 | } |
| 308 | } |
| 309 | |
| 310 | /** |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 311 | * Applies an {@link AtomixLeaderElectorOperations#GET_ALL_LEADERSHIPS} commit. |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 312 | * @param commit GetAllLeaderships commit |
| 313 | * @return topic to leader mapping |
| 314 | */ |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 315 | public Map<String, Leadership> allLeaderships(Commit<Void> commit) { |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 316 | Map<String, Leadership> result = new HashMap<>(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 317 | try { |
Madan Jampani | 630e7ac | 2016-05-31 11:34:05 -0700 | [diff] [blame] | 318 | result.putAll(Maps.transformEntries(elections, (k, v) -> leadership(k))); |
| 319 | return result; |
Madan Jampani | ea98f41 | 2016-06-22 09:05:40 -0700 | [diff] [blame] | 320 | } catch (Exception e) { |
Jordan Halterman | 6807c8f | 2017-08-28 20:58:24 -0700 | [diff] [blame] | 321 | logger().error("State machine operation failed", e); |
Ray Milkey | 6a51cb9 | 2018-03-06 09:03:03 -0800 | [diff] [blame] | 322 | throw new IllegalStateException(e); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 323 | } |
| 324 | } |
| 325 | |
| 326 | private Leadership leadership(String topic) { |
| 327 | return new Leadership(topic, |
| 328 | leader(topic), |
| 329 | candidates(topic)); |
| 330 | } |
| 331 | |
| 332 | private Leader leader(String topic) { |
| 333 | ElectionState electionState = elections.get(topic); |
| 334 | return electionState == null ? null : electionState.leader(); |
| 335 | } |
| 336 | |
| 337 | private List<NodeId> candidates(String topic) { |
| 338 | ElectionState electionState = elections.get(topic); |
| 339 | return electionState == null ? new LinkedList<>() : electionState.candidates(); |
| 340 | } |
| 341 | |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 342 | private void onSessionEnd(RaftSession session) { |
| 343 | listeners.remove(session.sessionId().id()); |
jaegonkim | 2074d13 | 2018-04-04 23:00:52 +0900 | [diff] [blame] | 344 | Set<String> topics = ImmutableSet.copyOf(elections.keySet()); |
Madan Jampani | db2afd3 | 2016-02-23 16:26:45 -0800 | [diff] [blame] | 345 | List<Change<Leadership>> changes = Lists.newArrayList(); |
jaegonkim | 2074d13 | 2018-04-04 23:00:52 +0900 | [diff] [blame] | 346 | for (String topic: topics) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 347 | Leadership oldLeadership = leadership(topic); |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 348 | elections.compute(topic, (k, v) -> v.cleanup(session, termCounter(topic)::incrementAndGet)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 349 | Leadership newLeadership = leadership(topic); |
| 350 | if (!Objects.equal(oldLeadership, newLeadership)) { |
Madan Jampani | db2afd3 | 2016-02-23 16:26:45 -0800 | [diff] [blame] | 351 | changes.add(new Change<>(oldLeadership, newLeadership)); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 352 | } |
jaegonkim | 2074d13 | 2018-04-04 23:00:52 +0900 | [diff] [blame] | 353 | } |
Madan Jampani | db2afd3 | 2016-02-23 16:26:45 -0800 | [diff] [blame] | 354 | notifyLeadershipChanges(changes); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | private static class Registration { |
| 358 | private final NodeId nodeId; |
| 359 | private final long sessionId; |
| 360 | |
| 361 | public Registration(NodeId nodeId, long sessionId) { |
| 362 | this.nodeId = nodeId; |
| 363 | this.sessionId = sessionId; |
| 364 | } |
| 365 | |
| 366 | public NodeId nodeId() { |
| 367 | return nodeId; |
| 368 | } |
| 369 | |
| 370 | public long sessionId() { |
| 371 | return sessionId; |
| 372 | } |
| 373 | |
| 374 | @Override |
| 375 | public String toString() { |
| 376 | return MoreObjects.toStringHelper(getClass()) |
| 377 | .add("nodeId", nodeId) |
| 378 | .add("sessionId", sessionId) |
| 379 | .toString(); |
| 380 | } |
| 381 | } |
| 382 | |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 383 | private static class ElectionState { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 384 | final Registration leader; |
| 385 | final long term; |
| 386 | final long termStartTime; |
| 387 | final List<Registration> registrations; |
| 388 | |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 389 | public ElectionState(Registration registration, Supplier<Long> termCounter) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 390 | registrations = Arrays.asList(registration); |
| 391 | term = termCounter.get(); |
| 392 | termStartTime = System.currentTimeMillis(); |
| 393 | leader = registration; |
| 394 | } |
| 395 | |
| 396 | public ElectionState(ElectionState other) { |
| 397 | registrations = Lists.newArrayList(other.registrations); |
| 398 | leader = other.leader; |
| 399 | term = other.term; |
| 400 | termStartTime = other.termStartTime; |
| 401 | } |
| 402 | |
| 403 | public ElectionState(List<Registration> registrations, |
| 404 | Registration leader, |
| 405 | long term, |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 406 | long termStartTime) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 407 | this.registrations = Lists.newArrayList(registrations); |
| 408 | this.leader = leader; |
| 409 | this.term = term; |
| 410 | this.termStartTime = termStartTime; |
| 411 | } |
| 412 | |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 413 | public ElectionState cleanup(RaftSession session, Supplier<Long> termCounter) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 414 | Optional<Registration> registration = |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 415 | registrations.stream().filter(r -> r.sessionId() == session.sessionId().id()).findFirst(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 416 | if (registration.isPresent()) { |
| 417 | List<Registration> updatedRegistrations = |
| 418 | registrations.stream() |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 419 | .filter(r -> r.sessionId() != session.sessionId().id()) |
| 420 | .collect(Collectors.toList()); |
| 421 | if (leader.sessionId() == session.sessionId().id()) { |
Jon Hall | cbd1b39 | 2017-01-18 20:15:44 -0800 | [diff] [blame] | 422 | if (!updatedRegistrations.isEmpty()) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 423 | return new ElectionState(updatedRegistrations, |
| 424 | updatedRegistrations.get(0), |
| 425 | termCounter.get(), |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 426 | System.currentTimeMillis()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 427 | } else { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 428 | return new ElectionState(updatedRegistrations, null, term, termStartTime); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 429 | } |
| 430 | } else { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 431 | return new ElectionState(updatedRegistrations, leader, term, termStartTime); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 432 | } |
| 433 | } else { |
| 434 | return this; |
| 435 | } |
| 436 | } |
| 437 | |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 438 | public ElectionState evict(NodeId nodeId, Supplier<Long> termCounter) { |
| 439 | Optional<Registration> registration = |
| 440 | registrations.stream().filter(r -> r.nodeId.equals(nodeId)).findFirst(); |
| 441 | if (registration.isPresent()) { |
| 442 | List<Registration> updatedRegistrations = |
| 443 | registrations.stream() |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 444 | .filter(r -> !r.nodeId().equals(nodeId)) |
| 445 | .collect(Collectors.toList()); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 446 | if (leader.nodeId().equals(nodeId)) { |
Jon Hall | cbd1b39 | 2017-01-18 20:15:44 -0800 | [diff] [blame] | 447 | if (!updatedRegistrations.isEmpty()) { |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 448 | return new ElectionState(updatedRegistrations, |
| 449 | updatedRegistrations.get(0), |
| 450 | termCounter.get(), |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 451 | System.currentTimeMillis()); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 452 | } else { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 453 | return new ElectionState(updatedRegistrations, null, term, termStartTime); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 454 | } |
| 455 | } else { |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 456 | return new ElectionState(updatedRegistrations, leader, term, termStartTime); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 457 | } |
| 458 | } else { |
| 459 | return this; |
| 460 | } |
| 461 | } |
| 462 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 463 | public boolean isDuplicate(Registration registration) { |
| 464 | return registrations.stream().anyMatch(r -> r.sessionId() == registration.sessionId()); |
| 465 | } |
| 466 | |
| 467 | public Leader leader() { |
| 468 | if (leader == null) { |
| 469 | return null; |
| 470 | } else { |
| 471 | NodeId leaderNodeId = leader.nodeId(); |
| 472 | return new Leader(leaderNodeId, term, termStartTime); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | public List<NodeId> candidates() { |
| 477 | return registrations.stream().map(registration -> registration.nodeId()).collect(Collectors.toList()); |
| 478 | } |
| 479 | |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 480 | public ElectionState addRegistration(Registration registration, Supplier<Long> termCounter) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 481 | if (!registrations.stream().anyMatch(r -> r.sessionId() == registration.sessionId())) { |
| 482 | List<Registration> updatedRegistrations = new LinkedList<>(registrations); |
| 483 | updatedRegistrations.add(registration); |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 484 | boolean newLeader = leader == null; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 485 | return new ElectionState(updatedRegistrations, |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 486 | newLeader ? registration : leader, |
| 487 | newLeader ? termCounter.get() : term, |
| 488 | newLeader ? System.currentTimeMillis() : termStartTime); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 489 | } |
| 490 | return this; |
| 491 | } |
| 492 | |
| 493 | public ElectionState transferLeadership(NodeId nodeId, AtomicLong termCounter) { |
| 494 | Registration newLeader = registrations.stream() |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 495 | .filter(r -> r.nodeId().equals(nodeId)) |
| 496 | .findFirst() |
| 497 | .orElse(null); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 498 | if (newLeader != null) { |
| 499 | return new ElectionState(registrations, |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 500 | newLeader, |
| 501 | termCounter.incrementAndGet(), |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 502 | System.currentTimeMillis()); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 503 | } else { |
| 504 | return this; |
| 505 | } |
| 506 | } |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 507 | |
| 508 | public ElectionState promote(NodeId nodeId) { |
| 509 | Registration registration = registrations.stream() |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 510 | .filter(r -> r.nodeId().equals(nodeId)) |
| 511 | .findFirst() |
| 512 | .orElse(null); |
Madan Jampani | c94b485 | 2016-02-23 18:18:37 -0800 | [diff] [blame] | 513 | List<Registration> updatedRegistrations = Lists.newArrayList(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 514 | updatedRegistrations.add(registration); |
| 515 | registrations.stream() |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 516 | .filter(r -> !r.nodeId().equals(nodeId)) |
| 517 | .forEach(updatedRegistrations::add); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 518 | return new ElectionState(updatedRegistrations, |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 519 | leader, |
| 520 | term, |
Jordan Halterman | 48d75d6 | 2018-02-15 22:24:57 -0800 | [diff] [blame] | 521 | termStartTime); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 522 | |
| 523 | } |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | @Override |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 527 | public void onExpire(RaftSession session) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 528 | onSessionEnd(session); |
| 529 | } |
| 530 | |
| 531 | @Override |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 532 | public void onClose(RaftSession session) { |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 533 | onSessionEnd(session); |
| 534 | } |
| 535 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 536 | private AtomicLong termCounter(String topic) { |
| 537 | return termCounters.computeIfAbsent(topic, k -> new AtomicLong(0)); |
| 538 | } |
Jordan Halterman | 2bf177c | 2017-06-29 01:49:08 -0700 | [diff] [blame] | 539 | } |