Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 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.mastership.impl; |
| 17 | |
| 18 | import static org.onlab.util.Tools.groupedThreads; |
Ayaka Koshibe | 941f860 | 2015-04-15 14:17:08 -0700 | [diff] [blame] | 19 | import static org.onlab.util.Tools.futureGetOrElse; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 20 | import static org.onosproject.mastership.MastershipEvent.Type.MASTER_CHANGED; |
| 21 | import static org.slf4j.LoggerFactory.getLogger; |
| 22 | import static com.google.common.base.Preconditions.checkArgument; |
| 23 | |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 24 | import java.util.List; |
| 25 | import java.util.Map; |
| 26 | import java.util.Set; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 27 | import java.util.concurrent.CompletableFuture; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 28 | import java.util.concurrent.ExecutorService; |
| 29 | import java.util.concurrent.Executors; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 30 | import java.util.concurrent.ScheduledExecutorService; |
| 31 | import java.util.concurrent.TimeUnit; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 32 | import java.util.regex.Matcher; |
| 33 | import java.util.regex.Pattern; |
| 34 | import java.util.stream.Collectors; |
| 35 | |
| 36 | import org.apache.felix.scr.annotations.Activate; |
| 37 | import org.apache.felix.scr.annotations.Component; |
| 38 | import org.apache.felix.scr.annotations.Deactivate; |
| 39 | import org.apache.felix.scr.annotations.Reference; |
| 40 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 41 | import org.apache.felix.scr.annotations.Service; |
| 42 | import org.onlab.util.KryoNamespace; |
| 43 | import org.onosproject.cluster.ClusterService; |
| 44 | import org.onosproject.cluster.Leadership; |
| 45 | import org.onosproject.cluster.LeadershipEvent; |
| 46 | import org.onosproject.cluster.LeadershipEventListener; |
| 47 | import org.onosproject.cluster.LeadershipService; |
| 48 | import org.onosproject.cluster.NodeId; |
| 49 | import org.onosproject.cluster.RoleInfo; |
| 50 | import org.onosproject.mastership.MastershipEvent; |
| 51 | import org.onosproject.mastership.MastershipStore; |
| 52 | import org.onosproject.mastership.MastershipStoreDelegate; |
| 53 | import org.onosproject.mastership.MastershipTerm; |
| 54 | import org.onosproject.net.DeviceId; |
| 55 | import org.onosproject.net.MastershipRole; |
| 56 | import org.onosproject.store.AbstractStore; |
| 57 | import org.onosproject.store.cluster.messaging.ClusterCommunicationService; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 58 | import org.onosproject.store.cluster.messaging.MessageSubject; |
| 59 | import org.onosproject.store.serializers.KryoNamespaces; |
| 60 | import org.onosproject.store.serializers.KryoSerializer; |
| 61 | import org.onosproject.store.serializers.StoreSerializer; |
| 62 | import org.slf4j.Logger; |
| 63 | |
| 64 | import com.google.common.base.Objects; |
| 65 | import com.google.common.collect.Lists; |
| 66 | import com.google.common.collect.Maps; |
| 67 | import com.google.common.collect.Sets; |
| 68 | |
| 69 | /** |
| 70 | * Implementation of the MastershipStore on top of Leadership Service. |
| 71 | */ |
Madan Jampani | 5756c35 | 2015-04-29 00:23:58 -0700 | [diff] [blame] | 72 | @Component(immediate = true, enabled = true) |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 73 | @Service |
| 74 | public class ConsistentDeviceMastershipStore |
| 75 | extends AbstractStore<MastershipEvent, MastershipStoreDelegate> |
| 76 | implements MastershipStore { |
| 77 | |
| 78 | private final Logger log = getLogger(getClass()); |
| 79 | |
| 80 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 81 | protected LeadershipService leadershipService; |
| 82 | |
| 83 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 84 | protected ClusterService clusterService; |
| 85 | |
| 86 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 87 | protected ClusterCommunicationService clusterCommunicator; |
| 88 | |
| 89 | private NodeId localNodeId; |
| 90 | private final Set<DeviceId> connectedDevices = Sets.newHashSet(); |
| 91 | |
| 92 | private static final MessageSubject ROLE_QUERY_SUBJECT = |
| 93 | new MessageSubject("mastership-store-device-role-query"); |
| 94 | private static final MessageSubject ROLE_RELINQUISH_SUBJECT = |
| 95 | new MessageSubject("mastership-store-device-role-relinquish"); |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 96 | private static final MessageSubject TRANSITION_FROM_MASTER_TO_STANDBY_SUBJECT = |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 97 | new MessageSubject("mastership-store-device-mastership-relinquish"); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 98 | |
| 99 | private static final Pattern DEVICE_MASTERSHIP_TOPIC_PATTERN = |
Madan Jampani | 5756c35 | 2015-04-29 00:23:58 -0700 | [diff] [blame] | 100 | Pattern.compile("device:(.*)"); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 101 | |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 102 | private ExecutorService messageHandlingExecutor; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 103 | private ScheduledExecutorService transferExecutor; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 104 | private final LeadershipEventListener leadershipEventListener = |
| 105 | new InternalDeviceMastershipEventListener(); |
| 106 | |
| 107 | private static final String NODE_ID_NULL = "Node ID cannot be null"; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 108 | private static final String DEVICE_ID_NULL = "Device ID cannot be null"; |
| 109 | private static final int WAIT_BEFORE_MASTERSHIP_HANDOFF_MILLIS = 3000; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 110 | |
| 111 | public static final StoreSerializer SERIALIZER = new KryoSerializer() { |
| 112 | @Override |
| 113 | protected void setupKryoPool() { |
| 114 | serializerPool = KryoNamespace.newBuilder() |
| 115 | .register(KryoNamespaces.API) |
| 116 | .register(MastershipRole.class) |
| 117 | .register(MastershipEvent.class) |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 118 | .register(MastershipEvent.Type.class) |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 119 | .build(); |
| 120 | } |
| 121 | }; |
| 122 | |
| 123 | @Activate |
| 124 | public void activate() { |
| 125 | messageHandlingExecutor = |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 126 | Executors.newSingleThreadExecutor( |
| 127 | groupedThreads("onos/store/device/mastership", "message-handler")); |
| 128 | transferExecutor = |
| 129 | Executors.newSingleThreadScheduledExecutor( |
| 130 | groupedThreads("onos/store/device/mastership", "mastership-transfer-executor")); |
Madan Jampani | d46e18f | 2015-05-04 23:19:33 -0700 | [diff] [blame] | 131 | clusterCommunicator.<DeviceId, MastershipRole>addSubscriber(ROLE_QUERY_SUBJECT, |
| 132 | SERIALIZER::decode, |
| 133 | deviceId -> getRole(localNodeId, deviceId), |
| 134 | SERIALIZER::encode, |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 135 | messageHandlingExecutor); |
Madan Jampani | d46e18f | 2015-05-04 23:19:33 -0700 | [diff] [blame] | 136 | clusterCommunicator.<DeviceId, MastershipEvent>addSubscriber(ROLE_RELINQUISH_SUBJECT, |
| 137 | SERIALIZER::decode, |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 138 | this::relinquishLocalRole, |
Madan Jampani | d46e18f | 2015-05-04 23:19:33 -0700 | [diff] [blame] | 139 | SERIALIZER::encode, |
| 140 | messageHandlingExecutor); |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 141 | clusterCommunicator.addSubscriber(TRANSITION_FROM_MASTER_TO_STANDBY_SUBJECT, |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 142 | SERIALIZER::decode, |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 143 | this::transitionFromMasterToStandby, |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 144 | SERIALIZER::encode, |
| 145 | messageHandlingExecutor); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 146 | localNodeId = clusterService.getLocalNode().id(); |
| 147 | leadershipService.addListener(leadershipEventListener); |
| 148 | |
| 149 | log.info("Started."); |
| 150 | } |
| 151 | |
| 152 | @Deactivate |
| 153 | public void deactivate() { |
| 154 | clusterCommunicator.removeSubscriber(ROLE_QUERY_SUBJECT); |
| 155 | clusterCommunicator.removeSubscriber(ROLE_RELINQUISH_SUBJECT); |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 156 | clusterCommunicator.removeSubscriber(TRANSITION_FROM_MASTER_TO_STANDBY_SUBJECT); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 157 | messageHandlingExecutor.shutdown(); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 158 | transferExecutor.shutdown(); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 159 | leadershipService.removeListener(leadershipEventListener); |
| 160 | |
| 161 | log.info("Stoppped."); |
| 162 | } |
| 163 | |
| 164 | @Override |
| 165 | public MastershipRole requestRole(DeviceId deviceId) { |
| 166 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 167 | |
| 168 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 169 | if (connectedDevices.add(deviceId)) { |
| 170 | leadershipService.runForLeadership(leadershipTopic); |
| 171 | return MastershipRole.STANDBY; |
| 172 | } else { |
| 173 | Leadership leadership = leadershipService.getLeadership(leadershipTopic); |
| 174 | if (leadership != null && leadership.leader().equals(localNodeId)) { |
| 175 | return MastershipRole.MASTER; |
| 176 | } else { |
| 177 | return MastershipRole.STANDBY; |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
| 184 | checkArgument(nodeId != null, NODE_ID_NULL); |
| 185 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 186 | |
| 187 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 188 | Leadership leadership = leadershipService.getLeadership(leadershipTopic); |
| 189 | if (leadership != null && nodeId.equals(leadership.leader())) { |
| 190 | return MastershipRole.MASTER; |
| 191 | } |
| 192 | |
| 193 | if (localNodeId.equals(nodeId)) { |
| 194 | if (connectedDevices.contains(deviceId)) { |
| 195 | return MastershipRole.STANDBY; |
| 196 | } else { |
| 197 | return MastershipRole.NONE; |
| 198 | } |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 199 | } |
Ayaka Koshibe | 941f860 | 2015-04-15 14:17:08 -0700 | [diff] [blame] | 200 | MastershipRole role = futureGetOrElse(clusterCommunicator.sendAndReceive( |
Madan Jampani | 2bfa94c | 2015-04-11 05:03:49 -0700 | [diff] [blame] | 201 | deviceId, |
| 202 | ROLE_QUERY_SUBJECT, |
| 203 | SERIALIZER::encode, |
| 204 | SERIALIZER::decode, |
Ayaka Koshibe | 941f860 | 2015-04-15 14:17:08 -0700 | [diff] [blame] | 205 | nodeId), null); |
Madan Jampani | 2bfa94c | 2015-04-11 05:03:49 -0700 | [diff] [blame] | 206 | return role == null ? MastershipRole.NONE : role; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | @Override |
| 210 | public NodeId getMaster(DeviceId deviceId) { |
| 211 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 212 | |
| 213 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 214 | Leadership leadership = leadershipService.getLeadership(leadershipTopic); |
| 215 | return leadership != null ? leadership.leader() : null; |
| 216 | } |
| 217 | |
| 218 | @Override |
| 219 | public RoleInfo getNodes(DeviceId deviceId) { |
| 220 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 221 | |
| 222 | Map<NodeId, MastershipRole> roles = Maps.newHashMap(); |
| 223 | clusterService |
| 224 | .getNodes() |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 225 | .forEach((node) -> roles.put(node.id(), getRole(node.id(), deviceId))); |
| 226 | |
| 227 | NodeId master = null; |
| 228 | final List<NodeId> standbys = Lists.newLinkedList(); |
| 229 | |
Madan Jampani | 86940d9 | 2015-05-06 11:47:57 -0700 | [diff] [blame] | 230 | List<NodeId> candidates = leadershipService.getCandidates(createDeviceMastershipTopic(deviceId)); |
| 231 | |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 232 | for (Map.Entry<NodeId, MastershipRole> entry : roles.entrySet()) { |
| 233 | if (entry.getValue() == MastershipRole.MASTER) { |
| 234 | master = entry.getKey(); |
| 235 | } else if (entry.getValue() == MastershipRole.STANDBY) { |
| 236 | standbys.add(entry.getKey()); |
| 237 | } |
| 238 | } |
| 239 | |
Madan Jampani | 86940d9 | 2015-05-06 11:47:57 -0700 | [diff] [blame] | 240 | List<NodeId> sortedStandbyList = candidates.stream().filter(standbys::contains).collect(Collectors.toList()); |
| 241 | |
| 242 | return new RoleInfo(master, sortedStandbyList); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | @Override |
| 246 | public Set<DeviceId> getDevices(NodeId nodeId) { |
| 247 | checkArgument(nodeId != null, NODE_ID_NULL); |
| 248 | |
| 249 | return leadershipService |
| 250 | .ownedTopics(nodeId) |
| 251 | .stream() |
| 252 | .filter(this::isDeviceMastershipTopic) |
| 253 | .map(this::extractDeviceIdFromTopic) |
| 254 | .collect(Collectors.toSet()); |
| 255 | } |
| 256 | |
| 257 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 258 | public CompletableFuture<MastershipEvent> setMaster(NodeId nodeId, DeviceId deviceId) { |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 259 | checkArgument(nodeId != null, NODE_ID_NULL); |
| 260 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 261 | |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 262 | NodeId currentMaster = getMaster(deviceId); |
| 263 | if (nodeId.equals(currentMaster)) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 264 | return CompletableFuture.completedFuture(null); |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 265 | } else { |
| 266 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 267 | List<NodeId> candidates = leadershipService.getCandidates(leadershipTopic); |
| 268 | if (candidates.isEmpty()) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 269 | return CompletableFuture.completedFuture(null); |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 270 | } |
| 271 | if (leadershipService.makeTopCandidate(leadershipTopic, nodeId)) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 272 | CompletableFuture<MastershipEvent> result = new CompletableFuture<>(); |
| 273 | // There is brief wait before we step down from mastership. |
| 274 | // This is to ensure any work that happens when standby preference |
| 275 | // order changes can complete. For example: flow entries need to be backed |
| 276 | // to the new top standby (ONOS-1883) |
| 277 | // FIXME: This potentially introduces a race-condition. |
| 278 | // Right now role changes are only forced via CLI. |
| 279 | transferExecutor.schedule(() -> { |
| 280 | result.complete(transitionFromMasterToStandby(deviceId)); |
| 281 | }, WAIT_BEFORE_MASTERSHIP_HANDOFF_MILLIS, TimeUnit.MILLISECONDS); |
| 282 | return result; |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 283 | } else { |
| 284 | log.warn("Failed to promote {} to mastership for {}", nodeId, deviceId); |
| 285 | } |
| 286 | } |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 287 | return CompletableFuture.completedFuture(null); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | @Override |
| 291 | public MastershipTerm getTermFor(DeviceId deviceId) { |
| 292 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 293 | |
| 294 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 295 | Leadership leadership = leadershipService.getLeadership(leadershipTopic); |
| 296 | return leadership != null ? MastershipTerm.of(leadership.leader(), leadership.epoch()) : null; |
| 297 | } |
| 298 | |
| 299 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 300 | public CompletableFuture<MastershipEvent> setStandby(NodeId nodeId, DeviceId deviceId) { |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 301 | checkArgument(nodeId != null, NODE_ID_NULL); |
| 302 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 303 | |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 304 | NodeId currentMaster = getMaster(deviceId); |
| 305 | if (!nodeId.equals(currentMaster)) { |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 306 | return CompletableFuture.completedFuture(null); |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 307 | } |
Madan Jampani | d46e18f | 2015-05-04 23:19:33 -0700 | [diff] [blame] | 308 | |
| 309 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
| 310 | List<NodeId> candidates = leadershipService.getCandidates(leadershipTopic); |
| 311 | |
| 312 | NodeId newMaster = candidates.stream() |
| 313 | .filter(candidate -> !Objects.equal(nodeId, candidate)) |
| 314 | .findFirst() |
| 315 | .orElse(null); |
| 316 | log.info("Transitioning to role {} for {}. Next master: {}", |
| 317 | newMaster != null ? MastershipRole.STANDBY : MastershipRole.NONE, deviceId, newMaster); |
| 318 | |
| 319 | if (newMaster != null) { |
| 320 | return setMaster(newMaster, deviceId); |
| 321 | } |
| 322 | return relinquishRole(nodeId, deviceId); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | @Override |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 326 | public CompletableFuture<MastershipEvent> relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 327 | checkArgument(nodeId != null, NODE_ID_NULL); |
| 328 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 329 | |
| 330 | if (!nodeId.equals(localNodeId)) { |
| 331 | log.debug("Forwarding request to relinquish " |
| 332 | + "role for device {} to {}", deviceId, nodeId); |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 333 | return clusterCommunicator.sendAndReceive( |
Madan Jampani | 2bfa94c | 2015-04-11 05:03:49 -0700 | [diff] [blame] | 334 | deviceId, |
| 335 | ROLE_RELINQUISH_SUBJECT, |
| 336 | SERIALIZER::encode, |
| 337 | SERIALIZER::decode, |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 338 | nodeId); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 339 | } |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 340 | return CompletableFuture.completedFuture(relinquishLocalRole(deviceId)); |
| 341 | } |
| 342 | |
| 343 | private MastershipEvent relinquishLocalRole(DeviceId deviceId) { |
| 344 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 345 | |
| 346 | // Check if this node is can be managed by this node. |
| 347 | if (!connectedDevices.contains(deviceId)) { |
| 348 | return null; |
| 349 | } |
| 350 | |
| 351 | String leadershipTopic = createDeviceMastershipTopic(deviceId); |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 352 | NodeId currentLeader = leadershipService.getLeader(leadershipTopic); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 353 | |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 354 | MastershipEvent.Type eventType = Objects.equal(currentLeader, localNodeId) |
| 355 | ? MastershipEvent.Type.MASTER_CHANGED |
| 356 | : MastershipEvent.Type.BACKUPS_CHANGED; |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 357 | |
| 358 | connectedDevices.remove(deviceId); |
| 359 | leadershipService.withdraw(leadershipTopic); |
| 360 | |
| 361 | return new MastershipEvent(eventType, deviceId, getNodes(deviceId)); |
| 362 | } |
| 363 | |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 364 | private MastershipEvent transitionFromMasterToStandby(DeviceId deviceId) { |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 365 | checkArgument(deviceId != null, DEVICE_ID_NULL); |
| 366 | |
| 367 | NodeId currentMaster = getMaster(deviceId); |
| 368 | if (currentMaster == null) { |
| 369 | return null; |
| 370 | } |
| 371 | |
| 372 | if (!currentMaster.equals(localNodeId)) { |
| 373 | log.info("Forwarding request to relinquish " |
| 374 | + "mastership for device {} to {}", deviceId, currentMaster); |
| 375 | return futureGetOrElse(clusterCommunicator.sendAndReceive( |
| 376 | deviceId, |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 377 | TRANSITION_FROM_MASTER_TO_STANDBY_SUBJECT, |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 378 | SERIALIZER::encode, |
| 379 | SERIALIZER::decode, |
| 380 | currentMaster), null); |
| 381 | } |
| 382 | |
Madan Jampani | 9bd1f15 | 2015-04-30 23:33:35 -0700 | [diff] [blame] | 383 | return leadershipService.stepdown(createDeviceMastershipTopic(deviceId)) |
| 384 | ? new MastershipEvent(MastershipEvent.Type.MASTER_CHANGED, deviceId, getNodes(deviceId)) : null; |
Madan Jampani | 1af8e13 | 2015-04-30 16:41:18 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 387 | @Override |
| 388 | public void relinquishAllRole(NodeId nodeId) { |
| 389 | // Noop. LeadershipService already takes care of detecting and purging deadlocks. |
| 390 | } |
| 391 | |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 392 | private class InternalDeviceMastershipEventListener implements LeadershipEventListener { |
| 393 | @Override |
| 394 | public void event(LeadershipEvent event) { |
| 395 | Leadership leadership = event.subject(); |
| 396 | if (!isDeviceMastershipTopic(leadership.topic())) { |
| 397 | return; |
| 398 | } |
| 399 | NodeId nodeId = leadership.leader(); |
| 400 | DeviceId deviceId = extractDeviceIdFromTopic(leadership.topic()); |
| 401 | if (Objects.equal(nodeId, localNodeId) && connectedDevices.contains(deviceId)) { |
| 402 | switch (event.type()) { |
| 403 | case LEADER_ELECTED: |
| 404 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
| 405 | break; |
| 406 | case LEADER_REELECTED: |
| 407 | // There is no concept of leader re-election in the new distributed leadership manager. |
| 408 | throw new IllegalStateException("Unexpected event type"); |
| 409 | case LEADER_BOOTED: |
Madan Jampani | a2a229c | 2015-05-11 17:16:30 -0700 | [diff] [blame^] | 410 | notifyDelegate(new MastershipEvent(MASTER_CHANGED, deviceId, getNodes(deviceId))); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 411 | break; |
| 412 | default: |
| 413 | return; |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | private String createDeviceMastershipTopic(DeviceId deviceId) { |
Madan Jampani | 5756c35 | 2015-04-29 00:23:58 -0700 | [diff] [blame] | 420 | return String.format("device:%s", deviceId.toString()); |
Madan Jampani | 84b6b40 | 2015-02-25 17:49:54 -0800 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | private DeviceId extractDeviceIdFromTopic(String topic) { |
| 424 | Matcher m = DEVICE_MASTERSHIP_TOPIC_PATTERN.matcher(topic); |
| 425 | if (m.matches()) { |
| 426 | return DeviceId.deviceId(m.group(1)); |
| 427 | } else { |
| 428 | throw new IllegalArgumentException("Invalid device mastership topic: " + topic); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | private boolean isDeviceMastershipTopic(String topic) { |
| 433 | Matcher m = DEVICE_MASTERSHIP_TOPIC_PATTERN.matcher(topic); |
| 434 | return m.matches(); |
| 435 | } |
| 436 | |
Madan Jampani | c26eede | 2015-04-16 11:42:16 -0700 | [diff] [blame] | 437 | } |