diff --git a/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
index d817cf9..b9ca46f 100644
--- a/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
@@ -4,13 +4,15 @@
 import com.google.common.collect.Sets;
 import com.hazelcast.config.Config;
 import com.hazelcast.core.Hazelcast;
-import com.hazelcast.core.HazelcastInstance;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.onlab.onos.cluster.DefaultControllerNode;
 import org.onlab.onos.cluster.MastershipServiceAdapter;
 import org.onlab.onos.cluster.NodeId;
 import org.onlab.onos.event.Event;
+import org.onlab.onos.event.EventDeliveryService;
 import org.onlab.onos.event.impl.TestEventDispatcher;
 import org.onlab.onos.net.Device;
 import org.onlab.onos.net.DeviceId;
@@ -30,15 +32,20 @@
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
-import org.onlab.onos.store.common.StoreService;
 import org.onlab.onos.store.device.impl.DistributedDeviceStore;
 import org.onlab.onos.store.impl.StoreManager;
 import org.onlab.onos.store.impl.TestStoreManager;
+import org.onlab.packet.IpPrefix;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Map.Entry;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
 import static org.junit.Assert.*;
 import static org.onlab.onos.net.Device.Type.SWITCH;
 import static org.onlab.onos.net.DeviceId.deviceId;
@@ -65,6 +72,11 @@
     private static final PortNumber P2 = PortNumber.portNumber(2);
     private static final PortNumber P3 = PortNumber.portNumber(3);
 
+    private static final DefaultControllerNode SELF
+        = new DefaultControllerNode(new NodeId("foobar"),
+                        IpPrefix.valueOf("127.0.0.1"));
+
+
     private DeviceManager mgr;
 
     protected StoreManager storeManager;
@@ -75,6 +87,8 @@
     protected TestProvider provider;
     protected TestListener listener = new TestListener();
     private DistributedDeviceStore dstore;
+    private TestMastershipManager masterManager;
+    private EventDeliveryService eventService;
 
     @Before
     public void setUp() {
@@ -85,14 +99,18 @@
         // TODO should find a way to clean Hazelcast instance without shutdown.
         Config config = TestStoreManager.getTestConfig();
 
+        masterManager = new TestMastershipManager();
+
         storeManager = new TestStoreManager(Hazelcast.newHazelcastInstance(config));
         storeManager.activate();
 
-        dstore = new TestDistributedDeviceStore(storeManager);
+        dstore = new TestDistributedDeviceStore();
         dstore.activate();
+
         mgr.store = dstore;
-        mgr.eventDispatcher = new TestEventDispatcher();
-        mgr.mastershipService = new TestMastershipService();
+        eventService = new TestEventDispatcher();
+        mgr.eventDispatcher = eventService;
+        mgr.mastershipService = masterManager;
         mgr.activate();
 
         service.addListener(listener);
@@ -272,13 +290,21 @@
     }
 
     private class TestDistributedDeviceStore extends DistributedDeviceStore {
-        public TestDistributedDeviceStore(StoreService storeService) {
-            this.storeService = storeService;
+
+        public TestDistributedDeviceStore() {
+            this.storeService = storeManager;
         }
     }
 
-    private static class TestMastershipService extends MastershipServiceAdapter {
+    private static class TestMastershipManager extends MastershipServiceAdapter {
 
+        private ConcurrentMap<DeviceId, NodeId> masters = new ConcurrentHashMap<>();
+
+        public TestMastershipManager() {
+            // SELF master of all initially
+            masters.put(DID1, SELF.id());
+            masters.put(DID1, SELF.id());
+        }
         @Override
         public MastershipRole getLocalRole(DeviceId deviceId) {
             return MastershipRole.MASTER;
@@ -286,12 +312,27 @@
 
         @Override
         public Set<DeviceId> getDevicesOf(NodeId nodeId) {
-            return Sets.newHashSet(DID1, DID2);
+            HashSet<DeviceId> set = Sets.newHashSet();
+            for (Entry<DeviceId, NodeId> e : masters.entrySet()) {
+                if (e.getValue().equals(nodeId)) {
+                    set.add(e.getKey());
+                }
+            }
+            return set;
         }
 
         @Override
         public MastershipRole requestRoleFor(DeviceId deviceId) {
-            return MastershipRole.MASTER;
+            if (SELF.id().equals(masters.get(deviceId))) {
+                return MastershipRole.MASTER;
+            } else {
+                return MastershipRole.STANDBY;
+            }
+        }
+
+        @Override
+        public void relinquishMastership(DeviceId deviceId) {
+            masters.remove(deviceId, SELF.id());
         }
     }
 }
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
index 71cb5b1..ed19199 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
@@ -7,6 +7,7 @@
 import com.google.common.collect.ImmutableSet.Builder;
 import com.hazelcast.core.IMap;
 import com.hazelcast.core.ISet;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -15,7 +16,6 @@
 import org.onlab.onos.net.DefaultPort;
 import org.onlab.onos.net.Device;
 import org.onlab.onos.net.DeviceId;
-import org.onlab.onos.net.MastershipRole;
 import org.onlab.onos.net.Port;
 import org.onlab.onos.net.PortNumber;
 import org.onlab.onos.net.device.DeviceDescription;
@@ -38,7 +38,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
-
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.cache.CacheBuilder.newBuilder;
 import static org.onlab.onos.net.device.DeviceEvent.Type.*;
@@ -61,10 +60,6 @@
     private IMap<byte[], byte[]> rawDevices;
     private LoadingCache<DeviceId, Optional<DefaultDevice>> devices;
 
-    // private IMap<DeviceId, MastershipRole> roles;
-    private IMap<byte[], byte[]> rawRoles;
-    private LoadingCache<DeviceId, Optional<MastershipRole>> roles;
-
     // private ISet<DeviceId> availableDevices;
     private ISet<byte[]> availableDevices;
 
@@ -89,13 +84,6 @@
         // refresh/populate cache based on notification from other instance
         rawDevices.addEntryListener(new RemoteEventHandler<>(devices), includeValue);
 
-        rawRoles = theInstance.getMap("roles");
-        final OptionalCacheLoader<DeviceId, MastershipRole> rolesLoader
-                = new OptionalCacheLoader<>(storeService, rawRoles);
-        roles = new AbsentInvalidatingLoadingCache<>(newBuilder().build(rolesLoader));
-        // refresh/populate cache based on notification from other instance
-        rawRoles.addEntryListener(new RemoteEventHandler<>(roles), includeValue);
-
         // TODO cache availableDevices
         availableDevices = theInstance.getSet("availableDevices");
 
@@ -173,10 +161,6 @@
             devices.put(deviceId, Optional.of(device));
 
             availableDevices.add(deviceIdBytes);
-
-            // For now claim the device as a master automatically.
-            //rawRoles.put(deviceIdBytes, serialize(MastershipRole.MASTER));
-            //roles.put(deviceId, Optional.of(MastershipRole.MASTER));
         }
         return new DeviceEvent(DeviceEvent.Type.DEVICE_ADDED, device, null);
     }
@@ -350,8 +334,6 @@
     public DeviceEvent removeDevice(DeviceId deviceId) {
         synchronized (this) {
             byte[] deviceIdBytes = serialize(deviceId);
-            rawRoles.remove(deviceIdBytes);
-            roles.invalidate(deviceId);
 
             // TODO conditional remove?
             Device device = deserialize(rawDevices.remove(deviceIdBytes));