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; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 48 | import com.hazelcast.core.EntryEvent; |
| 49 | import com.hazelcast.core.EntryListener; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 50 | import com.hazelcast.core.MapEvent; |
Yuta HIGUCHI | 41f2ec0 | 2014-10-27 09:54:43 -0700 | [diff] [blame] | 51 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 52 | import static org.onlab.onos.net.MastershipRole.*; |
| 53 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 54 | /** |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 55 | * Distributed implementation of the mastership store. The store is |
| 56 | * responsible for the master selection process. |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 57 | */ |
| 58 | @Component(immediate = true) |
| 59 | @Service |
tom | 0755a36 | 2014-09-24 11:54:43 -0700 | [diff] [blame] | 60 | public class DistributedMastershipStore |
Yuta HIGUCHI | b0daa15 | 2014-11-10 16:58:57 -0800 | [diff] [blame] | 61 | extends AbstractHazelcastStore<MastershipEvent, MastershipStoreDelegate> |
| 62 | implements MastershipStore { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 63 | |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 64 | //term number representing that master has never been chosen yet |
| 65 | private static final Integer NOTHING = 0; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 66 | //initial term/TTL value |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 67 | private static final Integer INIT = 1; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 68 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 69 | //device to node roles |
| 70 | protected SMap<DeviceId, RoleValue> roleMap; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 71 | //devices to terms |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 72 | protected SMap<DeviceId, Integer> terms; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 73 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 74 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 75 | protected ClusterService clusterService; |
| 76 | |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame^] | 77 | private String listenerId; |
| 78 | |
Ayaka Koshibe | 406d010 | 2014-09-24 16:08:12 -0700 | [diff] [blame] | 79 | @Override |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 80 | @Activate |
| 81 | public void activate() { |
| 82 | super.activate(); |
| 83 | |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 84 | this.serializer = new KryoSerializer() { |
| 85 | @Override |
| 86 | protected void setupKryoPool() { |
Yuta HIGUCHI | 8d143d2 | 2014-10-19 23:15:09 -0700 | [diff] [blame] | 87 | serializerPool = KryoNamespace.newBuilder() |
| 88 | .register(KryoNamespaces.API) |
Yuta HIGUCHI | 91768e3 | 2014-11-22 05:06:35 -0800 | [diff] [blame] | 89 | .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID) |
| 90 | .register(new RoleValueSerializer(), RoleValue.class) |
| 91 | .build(); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 92 | } |
| 93 | }; |
| 94 | |
Yuta HIGUCHI | 9def047 | 2014-10-23 15:51:10 -0700 | [diff] [blame] | 95 | roleMap = new SMap<>(theInstance.<byte[], byte[]>getMap("nodeRoles"), this.serializer); |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame^] | 96 | listenerId = roleMap.addEntryListener((new RemoteMasterShipEventHandler()), true); |
Yuta HIGUCHI | 9def047 | 2014-10-23 15:51:10 -0700 | [diff] [blame] | 97 | terms = new SMap<>(theInstance.<byte[], byte[]>getMap("terms"), this.serializer); |
Yuta HIGUCHI | c8e19d4 | 2014-09-24 17:20:52 -0700 | [diff] [blame] | 98 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 99 | log.info("Started"); |
| 100 | } |
| 101 | |
| 102 | @Deactivate |
| 103 | public void deactivate() { |
Yuta HIGUCHI | d1a63e9 | 2014-12-02 13:14:28 -0800 | [diff] [blame^] | 104 | roleMap.removeEntryListener(listenerId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 105 | log.info("Stopped"); |
| 106 | } |
| 107 | |
| 108 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 109 | public MastershipRole getRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 110 | final RoleValue roleInfo = roleMap.get(deviceId); |
| 111 | if (roleInfo != null) { |
| 112 | return roleInfo.getRole(nodeId); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 113 | } |
| 114 | return NONE; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | @Override |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 118 | public MastershipEvent setMaster(NodeId newMaster, DeviceId deviceId) { |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 119 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 120 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 121 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 122 | final RoleValue rv = getRoleValue(deviceId); |
| 123 | final MastershipRole currentRole = rv.getRole(newMaster); |
| 124 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 125 | case MASTER: |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 126 | //reinforce mastership |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 127 | // RoleInfo integrity check |
| 128 | boolean modified = rv.reassign(newMaster, STANDBY, NONE); |
| 129 | if (modified) { |
| 130 | roleMap.put(deviceId, rv); |
| 131 | // should never reach here. |
| 132 | log.warn("{} was in both MASTER and STANDBY for {}", newMaster, deviceId); |
| 133 | // trigger BACKUPS_CHANGED? |
| 134 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 135 | return null; |
| 136 | case STANDBY: |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 137 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 138 | final NodeId currentMaster = rv.get(MASTER); |
| 139 | if (currentMaster != null) { |
| 140 | // place current master in STANDBY |
| 141 | rv.reassign(currentMaster, NONE, STANDBY); |
| 142 | rv.replace(currentMaster, newMaster, MASTER); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 143 | } else { |
| 144 | //no master before so just add. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 145 | rv.add(MASTER, newMaster); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 146 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 147 | // remove newMaster from STANDBY |
| 148 | rv.reassign(newMaster, STANDBY, NONE); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 149 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 150 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | fc981cf | 2014-10-21 12:44:17 -0700 | [diff] [blame] | 151 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 152 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 153 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 154 | return null; |
| 155 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 156 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 157 | roleMap.unlock(deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 158 | } |
| 159 | } |
| 160 | |
| 161 | @Override |
| 162 | public NodeId getMaster(DeviceId deviceId) { |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 163 | return getNode(MASTER, deviceId); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 166 | |
| 167 | @Override |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 168 | public RoleInfo getNodes(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 169 | RoleValue rv = roleMap.get(deviceId); |
| 170 | if (rv != null) { |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 171 | return rv.roleInfo(); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 172 | } else { |
| 173 | return new RoleInfo(); |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 174 | } |
| 175 | } |
| 176 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 177 | @Override |
| 178 | public Set<DeviceId> getDevices(NodeId nodeId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 179 | Set<DeviceId> devices = new HashSet<>(); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 180 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 181 | for (Map.Entry<DeviceId, RoleValue> el : roleMap.entrySet()) { |
| 182 | if (nodeId.equals(el.getValue().get(MASTER))) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 183 | devices.add(el.getKey()); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 184 | } |
| 185 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 186 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 187 | return devices; |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | @Override |
| 191 | public MastershipRole requestRole(DeviceId deviceId) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 192 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 193 | // if no master => become master |
| 194 | // if there already exists a master: |
| 195 | // if I was the master return MASTER |
| 196 | // else put myself in STANDBY and return STANDBY |
| 197 | |
| 198 | final NodeId local = clusterService.getLocalNode().id(); |
| 199 | boolean modified = false; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 200 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 201 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 202 | final RoleValue rv = getRoleValue(deviceId); |
| 203 | if (rv.get(MASTER) == null) { |
| 204 | // there's no master become one |
| 205 | // move out from STANDBY |
| 206 | rv.reassign(local, STANDBY, NONE); |
| 207 | rv.add(MASTER, local); |
| 208 | |
| 209 | updateTerm(deviceId); |
| 210 | roleMap.put(deviceId, rv); |
| 211 | return MASTER; |
| 212 | } |
| 213 | final MastershipRole currentRole = rv.getRole(local); |
| 214 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 215 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 216 | // RoleInfo integrity check |
| 217 | modified = rv.reassign(local, STANDBY, NONE); |
| 218 | if (modified) { |
| 219 | log.warn("{} was in both MASTER and STANDBY for {}", local, deviceId); |
| 220 | // should never reach here, |
| 221 | // but heal if we happened to be there |
| 222 | roleMap.put(deviceId, rv); |
| 223 | // trigger BACKUPS_CHANGED? |
| 224 | } |
| 225 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 226 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 227 | // RoleInfo integrity check |
| 228 | modified = rv.reassign(local, NONE, STANDBY); |
| 229 | if (modified) { |
| 230 | log.warn("{} was in both NONE and STANDBY for {}", local, deviceId); |
| 231 | // should never reach here, |
| 232 | // but heal if we happened to be there |
| 233 | roleMap.put(deviceId, rv); |
| 234 | // trigger BACKUPS_CHANGED? |
| 235 | } |
| 236 | return currentRole; |
| 237 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 238 | rv.reassign(local, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 239 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 240 | // TODO: notifyDelegate BACKUPS_CHANGED |
| 241 | return STANDBY; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 242 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 243 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 244 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 245 | return currentRole; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 246 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 247 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 248 | } |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | @Override |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 252 | public MastershipTerm getTermFor(DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 253 | // term information and role must be read atomically |
| 254 | // acquiring write lock for the device |
| 255 | roleMap.lock(deviceId); |
| 256 | try { |
| 257 | RoleValue rv = getRoleValue(deviceId); |
| 258 | final Integer term = terms.get(deviceId); |
| 259 | final NodeId master = rv.get(MASTER); |
Yuta HIGUCHI | dfe6e3b | 2014-10-30 11:31:51 -0700 | [diff] [blame] | 260 | if (term == null) { |
| 261 | return MastershipTerm.of(null, NOTHING); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 262 | } |
| 263 | return MastershipTerm.of(master, term); |
| 264 | } finally { |
| 265 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 266 | } |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 269 | @Override |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 270 | public MastershipEvent setStandby(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 271 | // if nodeId was MASTER, rotate STANDBY |
| 272 | // if nodeId was STANDBY no-op |
| 273 | // if nodeId was NONE, add to STANDBY |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 274 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 275 | roleMap.lock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 276 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 277 | final RoleValue rv = getRoleValue(deviceId); |
| 278 | final MastershipRole currentRole = getRole(nodeId, deviceId); |
| 279 | switch (currentRole) { |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 280 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 281 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 282 | rv.reassign(nodeId, NONE, STANDBY); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 283 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 284 | if (newMaster != null) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 285 | roleMap.put(deviceId, rv); |
| 286 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 287 | } else { |
| 288 | // no master candidate |
| 289 | roleMap.put(deviceId, rv); |
Yuta HIGUCHI | 0c6e184 | 2014-11-05 22:34:23 -0800 | [diff] [blame] | 290 | // TODO: Should there be new event type for no MASTER? |
| 291 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 292 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 293 | case STANDBY: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 294 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 295 | case NONE: |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 296 | rv.reassign(nodeId, NONE, STANDBY); |
Ayaka Koshibe | e8e4535 | 2014-10-16 00:37:19 -0700 | [diff] [blame] | 297 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 298 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 299 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 300 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 301 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 302 | return null; |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 303 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 304 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 308 | @Override |
| 309 | public MastershipEvent relinquishRole(NodeId nodeId, DeviceId deviceId) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 310 | // relinquishRole is basically set to None |
| 311 | |
| 312 | // If nodeId was master reelect next and remove nodeId |
| 313 | // else remove from STANDBY |
Ayaka Koshibe | 25fd23a | 2014-10-03 15:50:43 -0700 | [diff] [blame] | 314 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 315 | roleMap.lock(deviceId); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 316 | try { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 317 | final RoleValue rv = getRoleValue(deviceId); |
| 318 | final MastershipRole currentRole = rv.getRole(nodeId); |
| 319 | switch (currentRole) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 320 | case MASTER: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 321 | NodeId newMaster = reelect(nodeId, deviceId, rv); |
| 322 | if (newMaster != null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 323 | updateTerm(deviceId); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 324 | roleMap.put(deviceId, rv); |
| 325 | return new MastershipEvent(MASTER_CHANGED, deviceId, rv.roleInfo()); |
| 326 | } else { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 327 | // No master candidate - no more backups, device is likely |
| 328 | // fully disconnected |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 329 | roleMap.put(deviceId, rv); |
| 330 | // Should there be new event type? |
| 331 | return null; |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 332 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 333 | case STANDBY: |
| 334 | //fall through to reinforce relinquishment |
| 335 | case NONE: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 336 | boolean modified = rv.reassign(nodeId, STANDBY, NONE); |
| 337 | if (modified) { |
| 338 | roleMap.put(deviceId, rv); |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 339 | return new MastershipEvent(BACKUPS_CHANGED, deviceId, rv.roleInfo()); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 340 | } |
| 341 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 342 | default: |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 343 | log.warn("unknown Mastership Role {}", currentRole); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 344 | } |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 345 | return null; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 346 | } finally { |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 347 | roleMap.unlock(deviceId); |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 348 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 351 | // TODO: Consider moving this to RoleValue method |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 352 | //helper to fetch a new master candidate for a given device. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 353 | private NodeId reelect( |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 354 | NodeId current, DeviceId deviceId, RoleValue rv) { |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 355 | |
| 356 | //if this is an queue it'd be neater. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 357 | NodeId candidate = null; |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 358 | for (NodeId n : rv.nodesOfRole(STANDBY)) { |
| 359 | if (!current.equals(n)) { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 360 | candidate = n; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 361 | break; |
| 362 | } |
| 363 | } |
| 364 | |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 365 | if (candidate == null) { |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 366 | log.info("{} giving up and going to NONE for {}", current, deviceId); |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 367 | rv.remove(MASTER, current); |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 368 | // master did change, but there is no master candidate. |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 369 | return null; |
| 370 | } else { |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 371 | log.info("{} trying to pass mastership for {} to {}", current, deviceId, candidate); |
| 372 | rv.replace(current, candidate, MASTER); |
| 373 | rv.reassign(candidate, STANDBY, NONE); |
| 374 | return candidate; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 375 | } |
| 376 | } |
| 377 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 378 | //return the RoleValue structure for a device, or create one |
| 379 | private RoleValue getRoleValue(DeviceId deviceId) { |
| 380 | RoleValue value = roleMap.get(deviceId); |
| 381 | if (value == null) { |
| 382 | value = new RoleValue(); |
Ayaka Koshibe | a7384a8 | 2014-10-22 18:59:06 -0700 | [diff] [blame] | 383 | RoleValue concurrentlyAdded = roleMap.putIfAbsent(deviceId, value); |
| 384 | if (concurrentlyAdded != null) { |
| 385 | return concurrentlyAdded; |
| 386 | } |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 387 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 388 | return value; |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 391 | //get first applicable node out of store-unique structure. |
| 392 | private NodeId getNode(MastershipRole role, DeviceId deviceId) { |
| 393 | RoleValue value = roleMap.get(deviceId); |
| 394 | if (value != null) { |
| 395 | return value.get(role); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 396 | } |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 397 | return null; |
| 398 | } |
| 399 | |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 400 | //adds or updates term information. |
Yuta HIGUCHI | b5b71b3 | 2014-10-30 02:41:25 -0700 | [diff] [blame] | 401 | // must be guarded by roleMap.lock(deviceId) |
Ayaka Koshibe | f9b02fc | 2014-10-15 17:07:05 -0700 | [diff] [blame] | 402 | private void updateTerm(DeviceId deviceId) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 403 | Integer term = terms.get(deviceId); |
| 404 | if (term == null) { |
| 405 | term = terms.putIfAbsent(deviceId, INIT); |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 406 | if (term == null) { |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 407 | // initial term set successfully |
| 408 | return; |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 409 | } |
Yuta HIGUCHI | f1d159a | 2014-10-29 23:31:40 -0700 | [diff] [blame] | 410 | // concurrent initialization detected, |
| 411 | // fall through to try incrementing |
| 412 | } |
| 413 | Integer nextTerm = term + 1; |
| 414 | boolean success = terms.replace(deviceId, term, nextTerm); |
| 415 | while (!success) { |
| 416 | term = terms.get(deviceId); |
| 417 | if (term == null) { |
| 418 | // something is very wrong, but write something to avoid |
| 419 | // infinite loop. |
| 420 | log.warn("Term info for {} disappeared.", deviceId); |
| 421 | term = putIfAbsent(terms, deviceId, nextTerm); |
| 422 | } |
| 423 | nextTerm = term + 1; |
| 424 | success = terms.replace(deviceId, term, nextTerm); |
Ayaka Koshibe | c404770 | 2014-10-07 14:43:52 -0700 | [diff] [blame] | 425 | } |
Ayaka Koshibe | 8583ff3 | 2014-10-02 16:25:30 -0700 | [diff] [blame] | 426 | } |
| 427 | |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 428 | private class RemoteMasterShipEventHandler implements EntryListener<DeviceId, RoleValue> { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 429 | |
| 430 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 431 | public void entryAdded(EntryEvent<DeviceId, RoleValue> event) { |
Yuta HIGUCHI | eb5a0b9 | 2014-10-29 15:45:55 -0700 | [diff] [blame] | 432 | entryUpdated(event); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 436 | public void entryRemoved(EntryEvent<DeviceId, RoleValue> event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 437 | } |
| 438 | |
| 439 | @Override |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 440 | public void entryUpdated(EntryEvent<DeviceId, RoleValue> event) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 441 | // compare old and current RoleValues. If master is different, |
| 442 | // emit MASTER_CHANGED. else, emit BACKUPS_CHANGED. |
| 443 | RoleValue oldValue = event.getOldValue(); |
| 444 | RoleValue newValue = event.getValue(); |
| 445 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 446 | // There will be no oldValue at the very first instance of an EntryEvent. |
| 447 | // Technically, the progression is: null event -> null master -> some master; |
| 448 | // 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] | 449 | NodeId oldMaster = null; |
| 450 | if (oldValue != null) { |
| 451 | oldMaster = oldValue.get(MASTER); |
| 452 | } |
| 453 | NodeId newMaster = newValue.get(MASTER); |
| 454 | |
Ayaka Koshibe | 15f4d60 | 2014-11-03 16:26:27 -0800 | [diff] [blame] | 455 | if (!Objects.equal(oldMaster, newMaster)) { |
Ayaka Koshibe | 98bd12f | 2014-11-01 20:13:37 -0700 | [diff] [blame] | 456 | notifyDelegate(new MastershipEvent( |
| 457 | MASTER_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 458 | } else { |
| 459 | notifyDelegate(new MastershipEvent( |
| 460 | BACKUPS_CHANGED, event.getKey(), event.getValue().roleInfo())); |
| 461 | } |
Ayaka Koshibe | b5c63a0 | 2014-10-18 18:42:27 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | @Override |
| 465 | public void entryEvicted(EntryEvent<DeviceId, RoleValue> event) { |
| 466 | } |
| 467 | |
| 468 | @Override |
| 469 | public void mapEvicted(MapEvent event) { |
| 470 | } |
| 471 | |
| 472 | @Override |
| 473 | public void mapCleared(MapEvent event) { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 474 | } |
| 475 | } |
| 476 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 477 | } |