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 | */ |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 16 | package org.onosproject.store.mastership.impl; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 17 | |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 18 | import static org.onosproject.mastership.MastershipEvent.Type.MASTER_CHANGED; |
| 19 | import static org.onosproject.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 | |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 22 | import java.util.ArrayList; |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 23 | import java.util.HashSet; |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 24 | import java.util.List; |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 25 | import java.util.Map; |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 26 | import java.util.Map.Entry; |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 27 | import java.util.Set; |
Yuta HIGUCHI | c8e19d4 | 2014-09-24 17:20:52 -0700 | [diff] [blame] | 28 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 29 | import org.apache.felix.scr.annotations.Activate; |
| 30 | import org.apache.felix.scr.annotations.Component; |
| 31 | import org.apache.felix.scr.annotations.Deactivate; |
| 32 | import org.apache.felix.scr.annotations.Reference; |
| 33 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 34 | import org.apache.felix.scr.annotations.Service; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 35 | import org.onosproject.cluster.ClusterService; |
| 36 | import org.onosproject.cluster.NodeId; |
| 37 | import org.onosproject.cluster.RoleInfo; |
| 38 | import org.onosproject.mastership.MastershipEvent; |
| 39 | import org.onosproject.mastership.MastershipStore; |
| 40 | import org.onosproject.mastership.MastershipStoreDelegate; |
| 41 | import org.onosproject.mastership.MastershipTerm; |
| 42 | import org.onosproject.net.DeviceId; |
| 43 | import org.onosproject.net.MastershipRole; |
| 44 | import org.onosproject.store.hz.AbstractHazelcastStore; |
| 45 | import org.onosproject.store.hz.SMap; |
| 46 | import org.onosproject.store.serializers.KryoNamespaces; |
| 47 | import org.onosproject.store.serializers.KryoSerializer; |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 48 | import org.onlab.util.KryoNamespace; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 49 | |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 50 | import com.google.common.base.Objects; |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 51 | import com.hazelcast.config.Config; |
| 52 | import com.hazelcast.config.MapConfig; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 53 | import com.hazelcast.core.EntryEvent; |
| 54 | import com.hazelcast.core.EntryListener; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 55 | import com.hazelcast.core.MapEvent; |
Yuta HIGUCHI | 41f2ec0 | 2014-10-27 09:54:43 -0700 | [diff] [blame] | 56 | |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 57 | import static org.onosproject.net.MastershipRole.*; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 58 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 59 | /** |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 60 | * Distributed implementation of the mastership store. The store is |
| 61 | * responsible for the master selection process. |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 62 | */ |
| 63 | @Component(immediate = true) |
| 64 | @Service |
tom | 0755a36 | 2014-09-24 11:54:43 -0700 | [diff] [blame] | 65 | public class DistributedMastershipStore |
Yuta HIGUCHI | b0daa15 | 2014-11-10 16:58:57 -0800 | [diff] [blame] | 66 | extends AbstractHazelcastStore<MastershipEvent, MastershipStoreDelegate> |
| 67 | implements MastershipStore { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 68 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 69 | //term number representing that master has never been chosen yet |
| 70 | private static final Integer NOTHING = 0; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 71 | //initial term/TTL value |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 72 | private static final Integer INIT = 1; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 73 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 74 | //device to node roles |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 75 | private static final String NODE_ROLES_MAP_NAME = "nodeRoles"; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 76 | protected SMap<DeviceId, RoleValue> roleMap; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 77 | //devices to terms |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 78 | private static final String TERMS_MAP_NAME = "terms"; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 79 | protected SMap<DeviceId, Integer> terms; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 80 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 81 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 82 | protected ClusterService clusterService; |
| 83 | |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame] | 84 | private String listenerId; |
| 85 | |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 86 | @Override |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 87 | @Activate |
| 88 | public void activate() { |
| 89 | super.activate(); |
| 90 | |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 91 | this.serializer = new KryoSerializer() { |
| 92 | @Override |
| 93 | protected void setupKryoPool() { |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 94 | serializerPool = KryoNamespace.newBuilder() |
| 95 | .register(KryoNamespaces.API) |
Yuta HIGUCHI | 91768e3 | 2014-11-22 05:06:35 -0800 | [diff] [blame] | 96 | .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID) |
| 97 | .register(new RoleValueSerializer(), RoleValue.class) |
| 98 | .build(); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 99 | } |
| 100 | }; |
| 101 | |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 102 | final Config config = theInstance.getConfig(); |
| 103 | |
| 104 | MapConfig nodeRolesCfg = config.getMapConfig(NODE_ROLES_MAP_NAME); |
| 105 | nodeRolesCfg.setAsyncBackupCount(MapConfig.MAX_BACKUP_COUNT - nodeRolesCfg.getBackupCount()); |
| 106 | |
| 107 | MapConfig termsCfg = config.getMapConfig(TERMS_MAP_NAME); |
| 108 | termsCfg.setAsyncBackupCount(MapConfig.MAX_BACKUP_COUNT - termsCfg.getBackupCount()); |
| 109 | |
| 110 | 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] | 111 | listenerId = roleMap.addEntryListener((new RemoteMasterShipEventHandler()), true); |
Yuta HIGUCHI | d36a58e | 2014-12-02 12:46:33 -0800 | [diff] [blame] | 112 | terms = new SMap<>(theInstance.<byte[], byte[]>getMap(TERMS_MAP_NAME), this.serializer); |
Yuta HIGUCHI | c8e19d4 | 2014-09-24 17:20:52 -0700 | [diff] [blame] | 113 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 114 | log.info("Started"); |
| 115 | } |
| 116 | |
| 117 | @Deactivate |
| 118 | public void deactivate() { |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame] | 119 | roleMap.removeEntryListener(listenerId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 120 | log.info("Stopped"); |
| 121 | } |
| 122 | |
| 123 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 124 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 125 | final RoleValue roleInfo = roleMap.get(deviceId); |
| 126 | if (roleInfo != null) { |
| 127 | return roleInfo.getRole(nodeId); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 128 | } |
| 129 | return NONE; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | @Override |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 133 | public MastershipEvent setMaster(NodeId newMaster, DeviceId deviceId) { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 134 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 135 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 136 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 137 | final RoleValue rv = getRoleValue(deviceId); |
| 138 | final MastershipRole currentRole = rv.getRole(newMaster); |
| 139 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 140 | case MASTER: |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 141 | //reinforce mastership |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 142 | // RoleInfo integrity check |
| 143 | boolean modified = rv.reassign(newMaster, STANDBY, NONE); |
| 144 | if (modified) { |
| 145 | roleMap.put(deviceId, rv); |
| 146 | // should never reach here. |
| 147 | log.warn("{} was in both MASTER and STANDBY for {}", newMaster, deviceId); |
| 148 | // trigger BACKUPS_CHANGED? |
| 149 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 150 | return null; |
| 151 | case STANDBY: |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 152 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 153 | final NodeId currentMaster = rv.get(MASTER); |
| 154 | if (currentMaster != null) { |
| 155 | // place current master in STANDBY |
| 156 | rv.reassign(currentMaster, NONE, STANDBY); |
| 157 | rv.replace(currentMaster, newMaster, MASTER); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 158 | } else { |
| 159 | //no master before so just add. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 160 | rv.add(MASTER, newMaster); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 161 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 162 | // remove newMaster from STANDBY |
| 163 | rv.reassign(newMaster, STANDBY, NONE); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 164 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 165 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 166 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 167 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 168 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 169 | return null; |
| 170 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 171 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 172 | roleMap.unlock(deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 173 | } |
| 174 | } |
| 175 | |
| 176 | @Override |
| 177 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 178 | return getNode(MASTER, deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 181 | |
| 182 | @Override |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 183 | public RoleInfo getNodes(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 184 | RoleValue rv = roleMap.get(deviceId); |
| 185 | if (rv != null) { |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 186 | return rv.roleInfo(); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 187 | } else { |
| 188 | return new RoleInfo(); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 189 | } |
| 190 | } |
| 191 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 192 | @Override |
| 193 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 194 | Set<DeviceId> devices = new HashSet<>(); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 195 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 196 | for (Map.Entry<DeviceId, RoleValue> el : roleMap.entrySet()) { |
| 197 | if (nodeId.equals(el.getValue().get(MASTER))) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 198 | devices.add(el.getKey()); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 199 | } |
| 200 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 201 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 202 | return devices; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | @Override |
| 206 | public MastershipRole requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 207 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 208 | // if no master => become master |
| 209 | // if there already exists a master: |
| 210 | // if I was the master return MASTER |
| 211 | // else put myself in STANDBY and return STANDBY |
| 212 | |
| 213 | final NodeId local = clusterService.getLocalNode().id(); |
| 214 | boolean modified = false; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 215 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 216 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 217 | final RoleValue rv = getRoleValue(deviceId); |
| 218 | if (rv.get(MASTER) == null) { |
| 219 | // there's no master become one |
| 220 | // move out from STANDBY |
| 221 | rv.reassign(local, STANDBY, NONE); |
| 222 | rv.add(MASTER, local); |
| 223 | |
| 224 | updateTerm(deviceId); |
| 225 | roleMap.put(deviceId, rv); |
| 226 | return MASTER; |
| 227 | } |
| 228 | final MastershipRole currentRole = rv.getRole(local); |
| 229 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 230 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 231 | // RoleInfo integrity check |
| 232 | modified = rv.reassign(local, STANDBY, NONE); |
| 233 | if (modified) { |
| 234 | log.warn("{} was in both MASTER and STANDBY for {}", local, deviceId); |
| 235 | // should never reach here, |
| 236 | // but heal if we happened to be there |
| 237 | roleMap.put(deviceId, rv); |
| 238 | // trigger BACKUPS_CHANGED? |
| 239 | } |
| 240 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 241 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 242 | // RoleInfo integrity check |
| 243 | modified = rv.reassign(local, NONE, STANDBY); |
| 244 | if (modified) { |
| 245 | log.warn("{} was in both NONE and STANDBY for {}", local, deviceId); |
| 246 | // should never reach here, |
| 247 | // but heal if we happened to be there |
| 248 | roleMap.put(deviceId, rv); |
| 249 | // trigger BACKUPS_CHANGED? |
| 250 | } |
| 251 | return currentRole; |
| 252 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 253 | rv.reassign(local, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 254 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 255 | // TODO: notifyDelegate BACKUPS_CHANGED |
| 256 | return STANDBY; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 257 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 258 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 259 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 260 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 261 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 262 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 263 | } |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | @Override |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 267 | public MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 268 | // term information and role must be read atomically |
| 269 | // acquiring write lock for the device |
| 270 | roleMap.lock(deviceId); |
| 271 | try { |
| 272 | RoleValue rv = getRoleValue(deviceId); |
| 273 | final Integer term = terms.get(deviceId); |
| 274 | final NodeId master = rv.get(MASTER); |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 275 | if (term == null) { |
| 276 | return MastershipTerm.of(null, NOTHING); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 277 | } |
| 278 | return MastershipTerm.of(master, term); |
| 279 | } finally { |
| 280 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 281 | } |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 282 | } |
| 283 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 284 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 285 | public MastershipEvent setStandby(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 286 | // if nodeId was MASTER, rotate STANDBY |
| 287 | // if nodeId was STANDBY no-op |
| 288 | // if nodeId was NONE, add to STANDBY |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 289 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 290 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 291 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 292 | final RoleValue rv = getRoleValue(deviceId); |
| 293 | final MastershipRole currentRole = getRole(nodeId, deviceId); |
| 294 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 295 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 296 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 297 | rv.reassign(nodeId, NONE, STANDBY); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 298 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 299 | if (newMaster != null) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 300 | roleMap.put(deviceId, rv); |
| 301 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 302 | } else { |
| 303 | // no master candidate |
| 304 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | 6593489 | 2014-12-04 17:47:44 -0800 | [diff] [blame] | 305 | // TBD: Should there be new event type for no MASTER? |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 306 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 307 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 308 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 309 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 310 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 311 | rv.reassign(nodeId, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 312 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 313 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 314 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 315 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 316 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 317 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 318 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 319 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 320 | } |
| 321 | } |
| 322 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 323 | @Override |
| 324 | public MastershipEvent relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 325 | // relinquishRole is basically set to None |
| 326 | |
| 327 | // If nodeId was master reelect next and remove nodeId |
| 328 | // else remove from STANDBY |
Ayaka Koshibe | 25fd23a | 2014-10-03 15:50:43 -0700 | [diff] [blame] | 329 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 330 | roleMap.lock(deviceId); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 331 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 332 | final RoleValue rv = getRoleValue(deviceId); |
| 333 | final MastershipRole currentRole = rv.getRole(nodeId); |
| 334 | switch (currentRole) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 335 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 336 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 337 | if (newMaster != null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 338 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 339 | roleMap.put(deviceId, rv); |
| 340 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 341 | } else { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 342 | // No master candidate - no more backups, device is likely |
| 343 | // fully disconnected |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 344 | roleMap.put(deviceId, rv); |
| 345 | // Should there be new event type? |
| 346 | return null; |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 347 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 348 | case STANDBY: |
| 349 | //fall through to reinforce relinquishment |
| 350 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 351 | boolean modified = rv.reassign(nodeId, STANDBY, NONE); |
| 352 | if (modified) { |
| 353 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 354 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 355 | } |
| 356 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 357 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 358 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 359 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 360 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 361 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 362 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 363 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 364 | } |
| 365 | |
HIGUCHI Yuta | 59f0229 | 2015-02-25 19:51:48 -0800 | [diff] [blame] | 366 | @Override |
| 367 | public void relinquishAllRole(NodeId nodeId) { |
| 368 | |
| 369 | List<MastershipEvent> events = new ArrayList<>(); |
| 370 | for (Entry<DeviceId, RoleValue> entry : roleMap.entrySet()) { |
| 371 | final DeviceId deviceId = entry.getKey(); |
| 372 | final RoleValue roleValue = entry.getValue(); |
| 373 | |
| 374 | if (roleValue.contains(MASTER, nodeId) || |
| 375 | roleValue.contains(STANDBY, nodeId)) { |
| 376 | |
| 377 | MastershipEvent event = relinquishRole(nodeId, deviceId); |
| 378 | if (event != null) { |
| 379 | events.add(event); |
| 380 | } |
| 381 | } |
| 382 | } |
| 383 | notifyDelegate(events); |
| 384 | } |
| 385 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 386 | // TODO: Consider moving this to RoleValue method |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 387 | //helper to fetch a new master candidate for a given device. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 388 | private NodeId reelect( |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 389 | NodeId current, DeviceId deviceId, RoleValue rv) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 390 | |
| 391 | //if this is an queue it'd be neater. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 392 | NodeId candidate = null; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 393 | for (NodeId n : rv.nodesOfRole(STANDBY)) { |
| 394 | if (!current.equals(n)) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 395 | candidate = n; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 396 | break; |
| 397 | } |
| 398 | } |
| 399 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 400 | if (candidate == null) { |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 401 | log.info("{} giving up and going to NONE for {}", current, deviceId); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 402 | rv.remove(MASTER, current); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 403 | // master did change, but there is no master candidate. |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 404 | return null; |
| 405 | } else { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 406 | log.info("{} trying to pass mastership for {} to {}", current, deviceId, candidate); |
| 407 | rv.replace(current, candidate, MASTER); |
| 408 | rv.reassign(candidate, STANDBY, NONE); |
| 409 | return candidate; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 410 | } |
| 411 | } |
| 412 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 413 | //return the RoleValue structure for a device, or create one |
| 414 | private RoleValue getRoleValue(DeviceId deviceId) { |
| 415 | RoleValue value = roleMap.get(deviceId); |
| 416 | if (value == null) { |
| 417 | value = new RoleValue(); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 418 | RoleValue concurrentlyAdded = roleMap.putIfAbsent(deviceId, value); |
| 419 | if (concurrentlyAdded != null) { |
| 420 | return concurrentlyAdded; |
| 421 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 422 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 423 | return value; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 426 | //get first applicable node out of store-unique structure. |
| 427 | private NodeId getNode(MastershipRole role, DeviceId deviceId) { |
| 428 | RoleValue value = roleMap.get(deviceId); |
| 429 | if (value != null) { |
| 430 | return value.get(role); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 431 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 432 | return null; |
| 433 | } |
| 434 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 435 | //adds or updates term information. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 436 | // must be guarded by roleMap.lock(deviceId) |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 437 | private void updateTerm(DeviceId deviceId) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 438 | Integer term = terms.get(deviceId); |
| 439 | if (term == null) { |
| 440 | term = terms.putIfAbsent(deviceId, INIT); |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 441 | if (term == null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 442 | // initial term set successfully |
| 443 | return; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 444 | } |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 445 | // concurrent initialization detected, |
| 446 | // fall through to try incrementing |
| 447 | } |
| 448 | Integer nextTerm = term + 1; |
| 449 | boolean success = terms.replace(deviceId, term, nextTerm); |
| 450 | while (!success) { |
| 451 | term = terms.get(deviceId); |
| 452 | if (term == null) { |
| 453 | // something is very wrong, but write something to avoid |
| 454 | // infinite loop. |
| 455 | log.warn("Term info for {} disappeared.", deviceId); |
| 456 | term = putIfAbsent(terms, deviceId, nextTerm); |
| 457 | } |
| 458 | nextTerm = term + 1; |
| 459 | success = terms.replace(deviceId, term, nextTerm); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 460 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 463 | private class RemoteMasterShipEventHandler implements EntryListener<DeviceId, RoleValue> { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 464 | |
| 465 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 466 | public void entryAdded(EntryEvent<DeviceId, RoleValue> event) { |
Yuta HIGUCHI | eb5a0b9 | 2014-10-29 15:45:55 -0700 | [diff] [blame] | 467 | entryUpdated(event); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 468 | } |
| 469 | |
| 470 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 471 | public void entryRemoved(EntryEvent<DeviceId, RoleValue> event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 475 | public void entryUpdated(EntryEvent<DeviceId, RoleValue> event) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 476 | // compare old and current RoleValues. If master is different, |
| 477 | // emit MASTER_CHANGED. else, emit BACKUPS_CHANGED. |
| 478 | RoleValue oldValue = event.getOldValue(); |
| 479 | RoleValue newValue = event.getValue(); |
| 480 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 481 | // There will be no oldValue at the very first instance of an EntryEvent. |
| 482 | // Technically, the progression is: null event -> null master -> some master; |
| 483 | // 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] | 484 | NodeId oldMaster = null; |
| 485 | if (oldValue != null) { |
| 486 | oldMaster = oldValue.get(MASTER); |
| 487 | } |
| 488 | NodeId newMaster = newValue.get(MASTER); |
| 489 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 490 | if (!Objects.equal(oldMaster, newMaster)) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 491 | notifyDelegate(new MastershipEvent( |
| 492 | MASTER_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 493 | } else { |
| 494 | notifyDelegate(new MastershipEvent( |
| 495 | BACKUPS_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 496 | } |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | @Override |
| 500 | public void entryEvicted(EntryEvent<DeviceId, RoleValue> event) { |
| 501 | } |
| 502 | |
| 503 | @Override |
| 504 | public void mapEvicted(MapEvent event) { |
| 505 | } |
| 506 | |
| 507 | @Override |
| 508 | public void mapCleared(MapEvent event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 509 | } |
| 510 | } |
| 511 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 512 | } |