Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 1 | /* |
Ray Milkey | 34c9590 | 2015-04-15 09:47:53 -0700 | [diff] [blame] | 2 | * Copyright 2014-2015 Open Networking Laboratory |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 16 | package org.onosproject.cluster.impl; |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 17 | |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 18 | import com.codahale.metrics.Timer; |
| 19 | import com.codahale.metrics.Timer.Context; |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 20 | import com.google.common.collect.Lists; |
| 21 | import com.google.common.util.concurrent.Futures; |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 22 | import org.apache.felix.scr.annotations.Activate; |
tom | 4a5d171 | 2014-09-23 17:49:39 -0700 | [diff] [blame] | 23 | import org.apache.felix.scr.annotations.Component; |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 24 | import org.apache.felix.scr.annotations.Deactivate; |
| 25 | import org.apache.felix.scr.annotations.Reference; |
| 26 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
tom | 4a5d171 | 2014-09-23 17:49:39 -0700 | [diff] [blame] | 27 | import org.apache.felix.scr.annotations.Service; |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 28 | import org.onlab.metrics.MetricsService; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 29 | import org.onosproject.cluster.ClusterService; |
| 30 | import org.onosproject.cluster.ControllerNode; |
| 31 | import org.onosproject.cluster.NodeId; |
| 32 | import org.onosproject.cluster.RoleInfo; |
Thomas Vachuska | 42e8cce | 2015-07-29 19:25:18 -0700 | [diff] [blame] | 33 | import org.onosproject.event.AbstractListenerManager; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 34 | import org.onosproject.core.MetricsHelper; |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 35 | import org.onosproject.core.Permission; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 36 | import org.onosproject.mastership.MastershipAdminService; |
| 37 | import org.onosproject.mastership.MastershipEvent; |
| 38 | import org.onosproject.mastership.MastershipListener; |
| 39 | import org.onosproject.mastership.MastershipService; |
| 40 | import org.onosproject.mastership.MastershipStore; |
| 41 | import org.onosproject.mastership.MastershipStoreDelegate; |
| 42 | import org.onosproject.mastership.MastershipTerm; |
| 43 | import org.onosproject.mastership.MastershipTermService; |
| 44 | import org.onosproject.net.DeviceId; |
| 45 | import org.onosproject.net.MastershipRole; |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 46 | import org.slf4j.Logger; |
| 47 | |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 48 | import java.util.Collection; |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 49 | import java.util.HashMap; |
| 50 | import java.util.HashSet; |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 51 | import java.util.Iterator; |
| 52 | import java.util.List; |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 53 | import java.util.Map; |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 54 | import java.util.Set; |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 55 | import java.util.concurrent.CompletableFuture; |
| 56 | |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 57 | import static com.google.common.base.Preconditions.checkNotNull; |
| 58 | import static com.google.common.collect.Lists.newArrayList; |
| 59 | import static org.onlab.metrics.MetricsUtil.startTimer; |
| 60 | import static org.onlab.metrics.MetricsUtil.stopTimer; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 61 | import static org.onosproject.cluster.ControllerNode.State.ACTIVE; |
| 62 | import static org.onosproject.net.MastershipRole.MASTER; |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 63 | import static org.onosproject.security.AppGuard.checkPermission; |
Thomas Vachuska | 42e8cce | 2015-07-29 19:25:18 -0700 | [diff] [blame] | 64 | import static org.slf4j.LoggerFactory.getLogger; |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 65 | |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 66 | |
tom | 4a5d171 | 2014-09-23 17:49:39 -0700 | [diff] [blame] | 67 | @Component(immediate = true) |
| 68 | @Service |
Ayaka Koshibe | 3eed2b0 | 2014-09-23 13:28:05 -0700 | [diff] [blame] | 69 | public class MastershipManager |
Thomas Vachuska | 42e8cce | 2015-07-29 19:25:18 -0700 | [diff] [blame] | 70 | extends AbstractListenerManager<MastershipEvent, MastershipListener> |
Yuta HIGUCHI | a22f69f | 2014-11-24 22:25:17 -0800 | [diff] [blame] | 71 | implements MastershipService, MastershipAdminService, MastershipTermService, |
| 72 | MetricsHelper { |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 73 | |
| 74 | private static final String NODE_ID_NULL = "Node ID cannot be null"; |
| 75 | private static final String DEVICE_ID_NULL = "Device ID cannot be null"; |
| 76 | private static final String ROLE_NULL = "Mastership role cannot be null"; |
| 77 | |
| 78 | private final Logger log = getLogger(getClass()); |
| 79 | |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 80 | private final MastershipStoreDelegate delegate = new InternalDelegate(); |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 81 | |
| 82 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 83 | protected MastershipStore store; |
| 84 | |
| 85 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
tom | 4a5d171 | 2014-09-23 17:49:39 -0700 | [diff] [blame] | 86 | protected ClusterService clusterService; |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 87 | |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 88 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 89 | protected MetricsService metricsService; |
| 90 | |
Madan Jampani | c6e574f | 2015-05-29 13:41:52 -0700 | [diff] [blame] | 91 | private NodeId localNodeId; |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 92 | private Timer requestRoleTimer; |
Ayaka Koshibe | 3de43ca | 2014-09-26 16:40:23 -0700 | [diff] [blame] | 93 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 94 | @Activate |
| 95 | public void activate() { |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 96 | requestRoleTimer = createTimer("Mastership", "requestRole", "responseTime"); |
Madan Jampani | c6e574f | 2015-05-29 13:41:52 -0700 | [diff] [blame] | 97 | localNodeId = clusterService.getLocalNode().id(); |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 98 | eventDispatcher.addSink(MastershipEvent.class, listenerRegistry); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 99 | store.setDelegate(delegate); |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 100 | log.info("Started"); |
| 101 | } |
| 102 | |
| 103 | @Deactivate |
| 104 | public void deactivate() { |
| 105 | eventDispatcher.removeSink(MastershipEvent.class); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 106 | store.unsetDelegate(delegate); |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 107 | log.info("Stopped"); |
| 108 | } |
| 109 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 110 | @Override |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 111 | public CompletableFuture<Void> setRole(NodeId nodeId, DeviceId deviceId, MastershipRole role) { |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 112 | checkNotNull(nodeId, NODE_ID_NULL); |
| 113 | checkNotNull(deviceId, DEVICE_ID_NULL); |
| 114 | checkNotNull(role, ROLE_NULL); |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 115 | |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 116 | CompletableFuture<MastershipEvent> eventFuture = null; |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 117 | |
| 118 | switch (role) { |
| 119 | case MASTER: |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 120 | eventFuture = store.setMaster(nodeId, deviceId); |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 121 | break; |
| 122 | case STANDBY: |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 123 | eventFuture = store.setStandby(nodeId, deviceId); |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 124 | break; |
| 125 | case NONE: |
Madan Jampani | f7536ab | 2015-05-07 23:23:23 -0700 | [diff] [blame] | 126 | eventFuture = store.relinquishRole(nodeId, deviceId); |
Ayaka Koshibe | e60d452 | 2014-10-28 15:07:00 -0700 | [diff] [blame] | 127 | break; |
| 128 | default: |
| 129 | log.info("Unknown role; ignoring"); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 130 | return CompletableFuture.completedFuture(null); |
Ayaka Koshibe | 971a38a | 2014-09-30 11:56:23 -0700 | [diff] [blame] | 131 | } |
Ayaka Koshibe | d9f693e | 2014-09-29 18:04:54 -0700 | [diff] [blame] | 132 | |
Madan Jampani | c6e574f | 2015-05-29 13:41:52 -0700 | [diff] [blame] | 133 | return eventFuture.thenAccept(this::post) |
| 134 | .thenApply(v -> null); |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | @Override |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 138 | public MastershipRole getLocalRole(DeviceId deviceId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 139 | checkPermission(Permission.CLUSTER_READ); |
| 140 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 141 | checkNotNull(deviceId, DEVICE_ID_NULL); |
| 142 | return store.getRole(clusterService.getLocalNode().id(), deviceId); |
| 143 | } |
| 144 | |
| 145 | @Override |
Madan Jampani | c6e574f | 2015-05-29 13:41:52 -0700 | [diff] [blame] | 146 | public CompletableFuture<Void> relinquishMastership(DeviceId deviceId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 147 | checkPermission(Permission.CLUSTER_WRITE); |
Madan Jampani | c6e574f | 2015-05-29 13:41:52 -0700 | [diff] [blame] | 148 | return store.relinquishRole(localNodeId, deviceId) |
| 149 | .thenAccept(this::post) |
| 150 | .thenApply(v -> null); |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | @Override |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 154 | public CompletableFuture<MastershipRole> requestRoleFor(DeviceId deviceId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 155 | checkPermission(Permission.CLUSTER_WRITE); |
| 156 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 157 | checkNotNull(deviceId, DEVICE_ID_NULL); |
Yuta HIGUCHI | 6a46283 | 2014-11-23 23:56:03 -0800 | [diff] [blame] | 158 | final Context timer = startTimer(requestRoleTimer); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 159 | return store.requestRole(deviceId).whenComplete((result, error) -> stopTimer(timer)); |
| 160 | |
tom | b41d1ac | 2014-09-24 01:51:24 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | @Override |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 164 | public NodeId getMasterFor(DeviceId deviceId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 165 | checkPermission(Permission.CLUSTER_READ); |
| 166 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 167 | checkNotNull(deviceId, DEVICE_ID_NULL); |
| 168 | return store.getMaster(deviceId); |
| 169 | } |
| 170 | |
| 171 | @Override |
| 172 | public Set<DeviceId> getDevicesOf(NodeId nodeId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 173 | checkPermission(Permission.CLUSTER_READ); |
| 174 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 175 | checkNotNull(nodeId, NODE_ID_NULL); |
| 176 | return store.getDevices(nodeId); |
| 177 | } |
| 178 | |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 179 | @Override |
Ayaka Koshibe | abedb09 | 2014-10-20 17:01:31 -0700 | [diff] [blame] | 180 | public RoleInfo getNodesFor(DeviceId deviceId) { |
Changhoon Yoon | 541ef71 | 2015-05-23 17:18:34 +0900 | [diff] [blame] | 181 | checkPermission(Permission.CLUSTER_READ); |
| 182 | |
Ayaka Koshibe | 45503ce | 2014-10-14 11:26:45 -0700 | [diff] [blame] | 183 | checkNotNull(deviceId, DEVICE_ID_NULL); |
| 184 | return store.getNodes(deviceId); |
| 185 | } |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 186 | |
| 187 | @Override |
Yuta HIGUCHI | bcac499 | 2014-11-22 19:27:57 -0800 | [diff] [blame] | 188 | public MastershipTerm getMastershipTerm(DeviceId deviceId) { |
| 189 | return store.getTermFor(deviceId); |
Ayaka Koshibe | b70d34b | 2014-09-25 15:43:01 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 192 | @Override |
Yuta HIGUCHI | a22f69f | 2014-11-24 22:25:17 -0800 | [diff] [blame] | 193 | public MetricsService metricsService() { |
| 194 | return metricsService; |
| 195 | } |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 196 | |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 197 | @Override |
| 198 | public void balanceRoles() { |
| 199 | List<ControllerNode> nodes = newArrayList(clusterService.getNodes()); |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 200 | Map<ControllerNode, Set<DeviceId>> controllerDevices = new HashMap<>(); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 201 | int deviceCount = 0; |
| 202 | |
| 203 | // Create buckets reflecting current ownership. |
| 204 | for (ControllerNode node : nodes) { |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 205 | if (clusterService.getState(node.id()) == ACTIVE) { |
| 206 | Set<DeviceId> devicesOf = new HashSet<>(getDevicesOf(node.id())); |
| 207 | deviceCount += devicesOf.size(); |
| 208 | controllerDevices.put(node, devicesOf); |
| 209 | log.info("Node {} has {} devices.", node.id(), devicesOf.size()); |
| 210 | } |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 211 | } |
| 212 | |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 213 | // Now re-balance the buckets until they are roughly even. |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 214 | List<CompletableFuture<Void>> balanceBucketsFutures = Lists.newLinkedList(); |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 215 | int rounds = controllerDevices.keySet().size(); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 216 | for (int i = 0; i < rounds; i++) { |
| 217 | // Iterate over the buckets and find the smallest and the largest. |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 218 | ControllerNode smallest = findBucket(true, controllerDevices); |
| 219 | ControllerNode largest = findBucket(false, controllerDevices); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 220 | balanceBucketsFutures.add(balanceBuckets(smallest, largest, controllerDevices, deviceCount)); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 221 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 222 | CompletableFuture<Void> balanceRolesFuture = CompletableFuture.allOf( |
| 223 | balanceBucketsFutures.toArray(new CompletableFuture[balanceBucketsFutures.size()])); |
| 224 | |
| 225 | Futures.getUnchecked(balanceRolesFuture); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 226 | } |
| 227 | |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 228 | private ControllerNode findBucket(boolean min, |
| 229 | Map<ControllerNode, Set<DeviceId>> controllerDevices) { |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 230 | int xSize = min ? Integer.MAX_VALUE : -1; |
| 231 | ControllerNode xNode = null; |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 232 | for (ControllerNode node : controllerDevices.keySet()) { |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 233 | int size = controllerDevices.get(node).size(); |
| 234 | if ((min && size < xSize) || (!min && size > xSize)) { |
| 235 | xSize = size; |
| 236 | xNode = node; |
| 237 | } |
| 238 | } |
| 239 | return xNode; |
| 240 | } |
| 241 | |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 242 | private CompletableFuture<Void> balanceBuckets(ControllerNode smallest, ControllerNode largest, |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 243 | Map<ControllerNode, Set<DeviceId>> controllerDevices, |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 244 | int deviceCount) { |
| 245 | Collection<DeviceId> minBucket = controllerDevices.get(smallest); |
| 246 | Collection<DeviceId> maxBucket = controllerDevices.get(largest); |
| 247 | int bucketCount = controllerDevices.keySet().size(); |
| 248 | |
| 249 | int delta = (maxBucket.size() - minBucket.size()) / 2; |
| 250 | delta = Math.min(deviceCount / bucketCount, delta); |
| 251 | |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 252 | List<CompletableFuture<Void>> setRoleFutures = Lists.newLinkedList(); |
| 253 | |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 254 | if (delta > 0) { |
| 255 | log.info("Attempting to move {} nodes from {} to {}...", delta, |
| 256 | largest.id(), smallest.id()); |
| 257 | |
| 258 | int i = 0; |
| 259 | Iterator<DeviceId> it = maxBucket.iterator(); |
| 260 | while (it.hasNext() && i < delta) { |
| 261 | DeviceId deviceId = it.next(); |
| 262 | log.info("Setting {} as the master for {}", smallest.id(), deviceId); |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 263 | setRoleFutures.add(setRole(smallest.id(), deviceId, MASTER)); |
Thomas Vachuska | 12dfdc3 | 2014-11-29 16:03:12 -0800 | [diff] [blame] | 264 | controllerDevices.get(smallest).add(deviceId); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 265 | it.remove(); |
| 266 | i++; |
| 267 | } |
| 268 | } |
Madan Jampani | de003d9 | 2015-05-11 17:14:20 -0700 | [diff] [blame] | 269 | |
| 270 | return CompletableFuture.allOf(setRoleFutures.toArray(new CompletableFuture[setRoleFutures.size()])); |
Thomas Vachuska | 1e68bdd | 2014-11-29 13:53:10 -0800 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 274 | public class InternalDelegate implements MastershipStoreDelegate { |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 275 | @Override |
| 276 | public void notify(MastershipEvent event) { |
Thomas Vachuska | 42e8cce | 2015-07-29 19:25:18 -0700 | [diff] [blame] | 277 | post(event); |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 278 | } |
alshabib | 339a3d9 | 2014-09-26 17:54:32 -0700 | [diff] [blame] | 279 | } |
| 280 | |
Ayaka Koshibe | 1660969 | 2014-09-23 12:46:15 -0700 | [diff] [blame] | 281 | } |