Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 | */ |
Yuta HIGUCHI | 80912e6 | 2014-10-12 00:15:47 -0700 | [diff] [blame] | 16 | package org.onlab.onos.store.mastership.impl; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 17 | |
Yuta HIGUCHI | 80912e6 | 2014-10-12 00:15:47 -0700 | [diff] [blame] | 18 | import static org.onlab.onos.mastership.MastershipEvent.Type.MASTER_CHANGED; |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 19 | import static org.onlab.onos.mastership.MastershipEvent.Type.BACKUPS_CHANGED; |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 20 | import static org.apache.commons.lang3.concurrent.ConcurrentUtils.putIfAbsent; |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 21 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 22 | import java.util.HashSet; |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 23 | import java.util.Map; |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 24 | import java.util.Set; |
Yuta HIGUCHI | c8e19d4 | 2014-09-24 17:20:52 -0700 | [diff] [blame] | 25 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 26 | import org.apache.felix.scr.annotations.Activate; |
| 27 | import org.apache.felix.scr.annotations.Component; |
| 28 | import org.apache.felix.scr.annotations.Deactivate; |
| 29 | import org.apache.felix.scr.annotations.Reference; |
| 30 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 31 | import org.apache.felix.scr.annotations.Service; |
| 32 | import org.onlab.onos.cluster.ClusterService; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 33 | import org.onlab.onos.cluster.NodeId; |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 34 | import org.onlab.onos.cluster.RoleInfo; |
Yuta HIGUCHI | 80912e6 | 2014-10-12 00:15:47 -0700 | [diff] [blame] | 35 | import org.onlab.onos.mastership.MastershipEvent; |
| 36 | import org.onlab.onos.mastership.MastershipStore; |
| 37 | import org.onlab.onos.mastership.MastershipStoreDelegate; |
| 38 | import org.onlab.onos.mastership.MastershipTerm; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 39 | import org.onlab.onos.net.DeviceId; |
| 40 | import org.onlab.onos.net.MastershipRole; |
Yuta HIGUCHI | 41f2ec0 | 2014-10-27 09:54:43 -0700 | [diff] [blame] | 41 | import org.onlab.onos.store.hz.AbstractHazelcastStore; |
| 42 | import org.onlab.onos.store.hz.SMap; |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 43 | import org.onlab.onos.store.serializers.KryoNamespaces; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 44 | import org.onlab.onos.store.serializers.KryoSerializer; |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 45 | import org.onlab.util.KryoNamespace; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 46 | |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 47 | import com.google.common.base.Objects; |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 48 | import com.hazelcast.config.Config; |
| 49 | import com.hazelcast.config.MapConfig; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 50 | import com.hazelcast.core.EntryEvent; |
| 51 | import com.hazelcast.core.EntryListener; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 52 | import com.hazelcast.core.MapEvent; |
Yuta HIGUCHI | 41f2ec0 | 2014-10-27 09:54:43 -0700 | [diff] [blame] | 53 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 54 | import static org.onlab.onos.net.MastershipRole.*; |
| 55 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 56 | /** |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 57 | * Distributed implementation of the mastership store. The store is |
| 58 | * responsible for the master selection process. |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 59 | */ |
| 60 | @Component(immediate = true) |
| 61 | @Service |
tom | 0755a36 | 2014-09-24 11:54:43 -0700 | [diff] [blame] | 62 | public class DistributedMastershipStore |
Yuta HIGUCHI | b0daa15 | 2014-11-10 16:58:57 -0800 | [diff] [blame] | 63 | extends AbstractHazelcastStore<MastershipEvent, MastershipStoreDelegate> |
| 64 | implements MastershipStore { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 65 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 66 | //term number representing that master has never been chosen yet |
| 67 | private static final Integer NOTHING = 0; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 68 | //initial term/TTL value |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 69 | private static final Integer INIT = 1; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 70 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 71 | //device to node roles |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 72 | private static final String NODE_ROLES_MAP_NAME = "nodeRoles"; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 73 | protected SMap<DeviceId, RoleValue> roleMap; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 74 | //devices to terms |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 75 | private static final String TERMS_MAP_NAME = "terms"; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 76 | protected SMap<DeviceId, Integer> terms; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 77 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 78 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 79 | protected ClusterService clusterService; |
| 80 | |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame] | 81 | private String listenerId; |
| 82 | |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 83 | @Override |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 84 | @Activate |
| 85 | public void activate() { |
| 86 | super.activate(); |
| 87 | |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 88 | this.serializer = new KryoSerializer() { |
| 89 | @Override |
| 90 | protected void setupKryoPool() { |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 91 | serializerPool = KryoNamespace.newBuilder() |
| 92 | .register(KryoNamespaces.API) |
Yuta HIGUCHI | 91768e3 | 2014-11-22 05:06:35 -0800 | [diff] [blame] | 93 | .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID) |
| 94 | .register(new RoleValueSerializer(), RoleValue.class) |
| 95 | .build(); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 96 | } |
| 97 | }; |
| 98 | |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 99 | final Config config = theInstance.getConfig(); |
| 100 | |
| 101 | MapConfig nodeRolesCfg = config.getMapConfig(NODE_ROLES_MAP_NAME); |
| 102 | nodeRolesCfg.setAsyncBackupCount(MapConfig.MAX_BACKUP_COUNT - nodeRolesCfg.getBackupCount()); |
| 103 | |
| 104 | MapConfig termsCfg = config.getMapConfig(TERMS_MAP_NAME); |
| 105 | termsCfg.setAsyncBackupCount(MapConfig.MAX_BACKUP_COUNT - termsCfg.getBackupCount()); |
| 106 | |
| 107 | roleMap = new SMap<>(theInstance.<byte[], byte[]>getMap(NODE_ROLES_MAP_NAME), this.serializer); |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame] | 108 | listenerId = roleMap.addEntryListener((new RemoteMasterShipEventHandler()), true); |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 109 | terms = new SMap<>(theInstance.<byte[], byte[]>getMap(TERMS_MAP_NAME), this.serializer); |
Yuta HIGUCHI | c8e19d4 | 2014-09-24 17:20:52 -0700 | [diff] [blame] | 110 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 111 | log.info("Started"); |
| 112 | } |
| 113 | |
| 114 | @Deactivate |
| 115 | public void deactivate() { |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame] | 116 | roleMap.removeEntryListener(listenerId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 117 | log.info("Stopped"); |
| 118 | } |
| 119 | |
| 120 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 121 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 122 | final RoleValue roleInfo = roleMap.get(deviceId); |
| 123 | if (roleInfo != null) { |
| 124 | return roleInfo.getRole(nodeId); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 125 | } |
| 126 | return NONE; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | @Override |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 130 | public MastershipEvent setMaster(NodeId newMaster, DeviceId deviceId) { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 131 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 132 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 133 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 134 | final RoleValue rv = getRoleValue(deviceId); |
| 135 | final MastershipRole currentRole = rv.getRole(newMaster); |
| 136 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 137 | case MASTER: |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 138 | //reinforce mastership |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 139 | // RoleInfo integrity check |
| 140 | boolean modified = rv.reassign(newMaster, STANDBY, NONE); |
| 141 | if (modified) { |
| 142 | roleMap.put(deviceId, rv); |
| 143 | // should never reach here. |
| 144 | log.warn("{} was in both MASTER and STANDBY for {}", newMaster, deviceId); |
| 145 | // trigger BACKUPS_CHANGED? |
| 146 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 147 | return null; |
| 148 | case STANDBY: |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 149 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 150 | final NodeId currentMaster = rv.get(MASTER); |
| 151 | if (currentMaster != null) { |
| 152 | // place current master in STANDBY |
| 153 | rv.reassign(currentMaster, NONE, STANDBY); |
| 154 | rv.replace(currentMaster, newMaster, MASTER); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 155 | } else { |
| 156 | //no master before so just add. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 157 | rv.add(MASTER, newMaster); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 158 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 159 | // remove newMaster from STANDBY |
| 160 | rv.reassign(newMaster, STANDBY, NONE); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 161 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 162 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 163 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 164 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 165 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 166 | return null; |
| 167 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 168 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 169 | roleMap.unlock(deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 170 | } |
| 171 | } |
| 172 | |
| 173 | @Override |
| 174 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 175 | return getNode(MASTER, deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 178 | |
| 179 | @Override |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 180 | public RoleInfo getNodes(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 181 | RoleValue rv = roleMap.get(deviceId); |
| 182 | if (rv != null) { |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 183 | return rv.roleInfo(); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 184 | } else { |
| 185 | return new RoleInfo(); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 186 | } |
| 187 | } |
| 188 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 189 | @Override |
| 190 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 191 | Set<DeviceId> devices = new HashSet<>(); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 192 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 193 | for (Map.Entry<DeviceId, RoleValue> el : roleMap.entrySet()) { |
| 194 | if (nodeId.equals(el.getValue().get(MASTER))) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 195 | devices.add(el.getKey()); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 196 | } |
| 197 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 198 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 199 | return devices; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | @Override |
| 203 | public MastershipRole requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 204 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 205 | // if no master => become master |
| 206 | // if there already exists a master: |
| 207 | // if I was the master return MASTER |
| 208 | // else put myself in STANDBY and return STANDBY |
| 209 | |
| 210 | final NodeId local = clusterService.getLocalNode().id(); |
| 211 | boolean modified = false; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 212 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 213 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 214 | final RoleValue rv = getRoleValue(deviceId); |
| 215 | if (rv.get(MASTER) == null) { |
| 216 | // there's no master become one |
| 217 | // move out from STANDBY |
| 218 | rv.reassign(local, STANDBY, NONE); |
| 219 | rv.add(MASTER, local); |
| 220 | |
| 221 | updateTerm(deviceId); |
| 222 | roleMap.put(deviceId, rv); |
| 223 | return MASTER; |
| 224 | } |
| 225 | final MastershipRole currentRole = rv.getRole(local); |
| 226 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 227 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 228 | // RoleInfo integrity check |
| 229 | modified = rv.reassign(local, STANDBY, NONE); |
| 230 | if (modified) { |
| 231 | log.warn("{} was in both MASTER and STANDBY for {}", local, deviceId); |
| 232 | // should never reach here, |
| 233 | // but heal if we happened to be there |
| 234 | roleMap.put(deviceId, rv); |
| 235 | // trigger BACKUPS_CHANGED? |
| 236 | } |
| 237 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 238 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 239 | // RoleInfo integrity check |
| 240 | modified = rv.reassign(local, NONE, STANDBY); |
| 241 | if (modified) { |
| 242 | log.warn("{} was in both NONE and STANDBY for {}", local, deviceId); |
| 243 | // should never reach here, |
| 244 | // but heal if we happened to be there |
| 245 | roleMap.put(deviceId, rv); |
| 246 | // trigger BACKUPS_CHANGED? |
| 247 | } |
| 248 | return currentRole; |
| 249 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 250 | rv.reassign(local, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 251 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 252 | // TODO: notifyDelegate BACKUPS_CHANGED |
| 253 | return STANDBY; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 254 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 255 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 256 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 257 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 258 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 259 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 260 | } |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | @Override |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 264 | public MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 265 | // term information and role must be read atomically |
| 266 | // acquiring write lock for the device |
| 267 | roleMap.lock(deviceId); |
| 268 | try { |
| 269 | RoleValue rv = getRoleValue(deviceId); |
| 270 | final Integer term = terms.get(deviceId); |
| 271 | final NodeId master = rv.get(MASTER); |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 272 | if (term == null) { |
| 273 | return MastershipTerm.of(null, NOTHING); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 274 | } |
| 275 | return MastershipTerm.of(master, term); |
| 276 | } finally { |
| 277 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 278 | } |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 279 | } |
| 280 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 281 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 282 | public MastershipEvent setStandby(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 283 | // if nodeId was MASTER, rotate STANDBY |
| 284 | // if nodeId was STANDBY no-op |
| 285 | // if nodeId was NONE, add to STANDBY |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 286 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 287 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 288 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 289 | final RoleValue rv = getRoleValue(deviceId); |
| 290 | final MastershipRole currentRole = getRole(nodeId, deviceId); |
| 291 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 292 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 293 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 294 | rv.reassign(nodeId, NONE, STANDBY); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 295 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 296 | if (newMaster != null) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 297 | roleMap.put(deviceId, rv); |
| 298 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 299 | } else { |
| 300 | // no master candidate |
| 301 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 302 | // TODO: Should there be new event type for no MASTER? |
| 303 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 304 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 305 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 306 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 307 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 308 | rv.reassign(nodeId, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 309 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 310 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 311 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 312 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 313 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 314 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 315 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 316 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 317 | } |
| 318 | } |
| 319 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 320 | @Override |
| 321 | public MastershipEvent relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 322 | // relinquishRole is basically set to None |
| 323 | |
| 324 | // If nodeId was master reelect next and remove nodeId |
| 325 | // else remove from STANDBY |
Ayaka Koshibe | 25fd23a | 2014-10-03 15:50:43 -0700 | [diff] [blame] | 326 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 327 | roleMap.lock(deviceId); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 328 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 329 | final RoleValue rv = getRoleValue(deviceId); |
| 330 | final MastershipRole currentRole = rv.getRole(nodeId); |
| 331 | switch (currentRole) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 332 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 333 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 334 | if (newMaster != null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 335 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 336 | roleMap.put(deviceId, rv); |
| 337 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 338 | } else { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 339 | // No master candidate - no more backups, device is likely |
| 340 | // fully disconnected |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 341 | roleMap.put(deviceId, rv); |
| 342 | // Should there be new event type? |
| 343 | return null; |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 344 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 345 | case STANDBY: |
| 346 | //fall through to reinforce relinquishment |
| 347 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 348 | boolean modified = rv.reassign(nodeId, STANDBY, NONE); |
| 349 | if (modified) { |
| 350 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 351 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 352 | } |
| 353 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 354 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 355 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 356 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 357 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 358 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 359 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 360 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 363 | // TODO: Consider moving this to RoleValue method |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 364 | //helper to fetch a new master candidate for a given device. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 365 | private NodeId reelect( |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 366 | NodeId current, DeviceId deviceId, RoleValue rv) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 367 | |
| 368 | //if this is an queue it'd be neater. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 369 | NodeId candidate = null; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 370 | for (NodeId n : rv.nodesOfRole(STANDBY)) { |
| 371 | if (!current.equals(n)) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 372 | candidate = n; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 373 | break; |
| 374 | } |
| 375 | } |
| 376 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 377 | if (candidate == null) { |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 378 | log.info("{} giving up and going to NONE for {}", current, deviceId); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 379 | rv.remove(MASTER, current); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 380 | // master did change, but there is no master candidate. |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 381 | return null; |
| 382 | } else { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 383 | log.info("{} trying to pass mastership for {} to {}", current, deviceId, candidate); |
| 384 | rv.replace(current, candidate, MASTER); |
| 385 | rv.reassign(candidate, STANDBY, NONE); |
| 386 | return candidate; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 387 | } |
| 388 | } |
| 389 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 390 | //return the RoleValue structure for a device, or create one |
| 391 | private RoleValue getRoleValue(DeviceId deviceId) { |
| 392 | RoleValue value = roleMap.get(deviceId); |
| 393 | if (value == null) { |
| 394 | value = new RoleValue(); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 395 | RoleValue concurrentlyAdded = roleMap.putIfAbsent(deviceId, value); |
| 396 | if (concurrentlyAdded != null) { |
| 397 | return concurrentlyAdded; |
| 398 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 399 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 400 | return value; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 403 | //get first applicable node out of store-unique structure. |
| 404 | private NodeId getNode(MastershipRole role, DeviceId deviceId) { |
| 405 | RoleValue value = roleMap.get(deviceId); |
| 406 | if (value != null) { |
| 407 | return value.get(role); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 408 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 409 | return null; |
| 410 | } |
| 411 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 412 | //adds or updates term information. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 413 | // must be guarded by roleMap.lock(deviceId) |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 414 | private void updateTerm(DeviceId deviceId) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 415 | Integer term = terms.get(deviceId); |
| 416 | if (term == null) { |
| 417 | term = terms.putIfAbsent(deviceId, INIT); |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 418 | if (term == null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 419 | // initial term set successfully |
| 420 | return; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 421 | } |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 422 | // concurrent initialization detected, |
| 423 | // fall through to try incrementing |
| 424 | } |
| 425 | Integer nextTerm = term + 1; |
| 426 | boolean success = terms.replace(deviceId, term, nextTerm); |
| 427 | while (!success) { |
| 428 | term = terms.get(deviceId); |
| 429 | if (term == null) { |
| 430 | // something is very wrong, but write something to avoid |
| 431 | // infinite loop. |
| 432 | log.warn("Term info for {} disappeared.", deviceId); |
| 433 | term = putIfAbsent(terms, deviceId, nextTerm); |
| 434 | } |
| 435 | nextTerm = term + 1; |
| 436 | success = terms.replace(deviceId, term, nextTerm); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 437 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 438 | } |
| 439 | |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 440 | private class RemoteMasterShipEventHandler implements EntryListener<DeviceId, RoleValue> { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 441 | |
| 442 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 443 | public void entryAdded(EntryEvent<DeviceId, RoleValue> event) { |
Yuta HIGUCHI | eb5a0b9 | 2014-10-29 15:45:55 -0700 | [diff] [blame] | 444 | entryUpdated(event); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 448 | public void entryRemoved(EntryEvent<DeviceId, RoleValue> event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 452 | public void entryUpdated(EntryEvent<DeviceId, RoleValue> event) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 453 | // compare old and current RoleValues. If master is different, |
| 454 | // emit MASTER_CHANGED. else, emit BACKUPS_CHANGED. |
| 455 | RoleValue oldValue = event.getOldValue(); |
| 456 | RoleValue newValue = event.getValue(); |
| 457 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 458 | // There will be no oldValue at the very first instance of an EntryEvent. |
| 459 | // Technically, the progression is: null event -> null master -> some master; |
| 460 | // We say a null master and a null oldValue are the same condition. |
Yuta HIGUCHI | 780b138 | 2014-11-03 14:36:39 -0800 | [diff] [blame] | 461 | NodeId oldMaster = null; |
| 462 | if (oldValue != null) { |
| 463 | oldMaster = oldValue.get(MASTER); |
| 464 | } |
| 465 | NodeId newMaster = newValue.get(MASTER); |
| 466 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 467 | if (!Objects.equal(oldMaster, newMaster)) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 468 | notifyDelegate(new MastershipEvent( |
| 469 | MASTER_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 470 | } else { |
| 471 | notifyDelegate(new MastershipEvent( |
| 472 | BACKUPS_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 473 | } |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | @Override |
| 477 | public void entryEvicted(EntryEvent<DeviceId, RoleValue> event) { |
| 478 | } |
| 479 | |
| 480 | @Override |
| 481 | public void mapEvicted(MapEvent event) { |
| 482 | } |
| 483 | |
| 484 | @Override |
| 485 | public void mapCleared(MapEvent event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 486 | } |
| 487 | } |
| 488 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 489 | } |