diff --git a/src/main/java/org/redisson/RedissonListMultimap.java b/src/main/java/org/redisson/RedissonListMultimap.java
index d2e9db44e..5fd88ac8e 100644
--- a/src/main/java/org/redisson/RedissonListMultimap.java
+++ b/src/main/java/org/redisson/RedissonListMultimap.java
@@ -65,6 +65,8 @@ public class RedissonListMultimap<K, V> extends RedissonMultimap<K, V> implement
                 "return size; ",
                 Arrays.<Object>asList(getName()));
     }
+    
+    
 
     public Future<Boolean> containsKeyAsync(Object key) {
         try {
diff --git a/src/main/java/org/redisson/RedissonMultimap.java b/src/main/java/org/redisson/RedissonMultimap.java
index 602fa3cec..0d02efcf0 100644
--- a/src/main/java/org/redisson/RedissonMultimap.java
+++ b/src/main/java/org/redisson/RedissonMultimap.java
@@ -66,6 +66,11 @@ public abstract class RedissonMultimap<K, V> extends RedissonExpirable implement
     public int size() {
         return get(sizeAsync());
     }
+    
+    @Override
+    public int keySize() {
+    	return get(keySizeAsync());
+    }
 
     @Override
     public boolean isEmpty() {
@@ -237,8 +242,12 @@ public abstract class RedissonMultimap<K, V> extends RedissonExpirable implement
                 "return redis.call('persist', KEYS[1]); ",
                 Arrays.<Object>asList(getName()));
     }
-
-
+    
+    public Future<Integer> keySizeAsync() {
+    	return commandExecutor.readAsync(getName(), LongCodec.INSTANCE, RedisCommands.HLEN, getName());
+    }
+    
+    
     MapScanResult<ScanObjectEntry, ScanObjectEntry> scanIterator(InetSocketAddress client, long startPos) {
         Future<MapScanResult<ScanObjectEntry, ScanObjectEntry>> f = commandExecutor.readAsync(client, getName(), new ScanCodec(codec, StringCodec.INSTANCE), RedisCommands.HSCAN, getName(), startPos);
         return get(f);
@@ -272,7 +281,7 @@ public abstract class RedissonMultimap<K, V> extends RedissonExpirable implement
 
         @Override
         public int size() {
-            return RedissonMultimap.this.size();
+            return RedissonMultimap.this.keySize();
         }
 
         @Override
diff --git a/src/main/java/org/redisson/RedissonSetMultimap.java b/src/main/java/org/redisson/RedissonSetMultimap.java
index 3989bb762..74ee7a333 100644
--- a/src/main/java/org/redisson/RedissonSetMultimap.java
+++ b/src/main/java/org/redisson/RedissonSetMultimap.java
@@ -69,6 +69,8 @@ public class RedissonSetMultimap<K, V> extends RedissonMultimap<K, V> implements
                 Arrays.<Object>asList(getName()));
     }
 
+    
+    
     public Future<Boolean> containsKeyAsync(Object key) {
         try {
             byte[] keyState = codec.getMapKeyEncoder().encode(key);
diff --git a/src/main/java/org/redisson/connection/MasterSlaveEntry.java b/src/main/java/org/redisson/connection/MasterSlaveEntry.java
index 0fe9871a0..1e3cdefff 100644
--- a/src/main/java/org/redisson/connection/MasterSlaveEntry.java
+++ b/src/main/java/org/redisson/connection/MasterSlaveEntry.java
@@ -291,8 +291,10 @@ public class MasterSlaveEntry {
                 this.config.getSlaveSubscriptionConnectionMinimumIdleSize(),
                 this.config.getSlaveSubscriptionConnectionPoolSize(), connectionManager, mode);
         if (freezed) {
-            entry.setFreezed(freezed);
-            entry.setFreezeReason(FreezeReason.SYSTEM);
+            synchronized (entry) {
+                entry.setFreezed(freezed);
+                entry.setFreezeReason(FreezeReason.SYSTEM);
+            }
         }
         return slaveBalancer.add(entry);
     }
@@ -350,8 +352,10 @@ public class MasterSlaveEntry {
 
     public void unfreeze() {
         masterEntry.resetFailedAttempts();
-        masterEntry.setFreezed(false);
-        masterEntry.setFreezeReason(null);
+        synchronized (masterEntry) {
+            masterEntry.setFreezed(false);
+            masterEntry.setFreezeReason(null);
+        }
     }
 
     public void shutdownMasterAsync() {
diff --git a/src/main/java/org/redisson/core/RMultimap.java b/src/main/java/org/redisson/core/RMultimap.java
index 7f39b53ce..338bcc9c6 100644
--- a/src/main/java/org/redisson/core/RMultimap.java
+++ b/src/main/java/org/redisson/core/RMultimap.java
@@ -162,6 +162,11 @@ public interface RMultimap<K, V> extends RExpirable, RMultimapAsync<K, V> {
      * vice versa. However, <i>adding</i> to the returned set is not possible.
      */
     Set<K> keySet();
+    
+    /**
+     *  Returns the count of distinct keys in this multimap.
+     */
+    int keySize();
 
     /**
      * Returns a view collection containing the <i>value</i> from each key-value
diff --git a/src/main/java/org/redisson/core/RMultimapAsync.java b/src/main/java/org/redisson/core/RMultimapAsync.java
index 5c64da558..b9710df71 100644
--- a/src/main/java/org/redisson/core/RMultimapAsync.java
+++ b/src/main/java/org/redisson/core/RMultimapAsync.java
@@ -123,6 +123,14 @@ public interface RMultimapAsync<K, V> extends RExpirableAsync {
     Future<Collection<V>> removeAllAsync(Object key);
 
     Future<Collection<V>> getAllAsync(K key);
+    
+    
+    /**
+     * Returns the number of key-value pairs in this multimap.
+     *
+     * @return
+     */
+    Future<Integer> keySizeAsync();
 
     /**
      * Removes <code>keys</code> from map by one operation
diff --git a/src/main/java/org/redisson/spring/cache/RedissonCache.java b/src/main/java/org/redisson/spring/cache/RedissonCache.java
index 5c17e466d..31efe95a9 100644
--- a/src/main/java/org/redisson/spring/cache/RedissonCache.java
+++ b/src/main/java/org/redisson/spring/cache/RedissonCache.java
@@ -17,13 +17,8 @@ package org.redisson.spring.cache;
 
 import java.io.IOException;
 import java.lang.reflect.Constructor;
-import java.util.Map;
 import java.util.concurrent.Callable;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
 
 import org.redisson.RedissonClient;
 import org.redisson.core.RLock;
@@ -40,8 +35,6 @@ import org.springframework.cache.support.SimpleValueWrapper;
  */
 public class RedissonCache implements Cache {
 
-    private final ConcurrentMap<Object, Lock> valueLoaderLocks = new ConcurrentHashMap<Object, Lock>();
-    
     private RMapCache<Object, Object> mapCache;
 
     private final RMap<Object, Object> map;
@@ -130,18 +123,6 @@ public class RedissonCache implements Cache {
         return new SimpleValueWrapper(value);
     }
 
-    public Lock getLock(Object key) {
-        Lock lock = valueLoaderLocks.get(key);
-        if (lock == null) {
-            Lock newlock = new ReentrantLock();
-            lock = valueLoaderLocks.putIfAbsent(key, newlock);
-            if (lock == null) {
-                lock = newlock;
-            }
-        }
-        return lock;
-    }
-    
     public <T> T get(Object key, Callable<T> valueLoader) {
         Object value = map.get(key);
         if (value == null) {
diff --git a/src/test/java/org/redisson/RedissonListMultimapTest.java b/src/test/java/org/redisson/RedissonListMultimapTest.java
index e6f6eeec0..b541bd405 100644
--- a/src/test/java/org/redisson/RedissonListMultimapTest.java
+++ b/src/test/java/org/redisson/RedissonListMultimapTest.java
@@ -131,6 +131,23 @@ public class RedissonListMultimapTest extends BaseTest {
         assertThat(s).isEmpty();
         assertThat(map.size()).isEqualTo(1);
     }
+    
+    @Test
+    public void testKeySize() {
+        RListMultimap<SimpleKey, SimpleValue> map = redisson.getListMultimap("test1");
+        map.put(new SimpleKey("0"), new SimpleValue("1"));
+        map.put(new SimpleKey("0"), new SimpleValue("2"));
+        map.put(new SimpleKey("1"), new SimpleValue("4"));
+
+        assertThat(map.keySize()).isEqualTo(2);
+
+        assertThat(map.fastRemove(new SimpleKey("0"))).isEqualTo(1);
+
+        List<SimpleValue> s = map.get(new SimpleKey("0"));
+        assertThat(s).isEmpty();
+        assertThat(map.size()).isEqualTo(1);
+    }
+    
 
     @Test
     public void testPut() {
diff --git a/src/test/java/org/redisson/RedissonSetMultimapTest.java b/src/test/java/org/redisson/RedissonSetMultimapTest.java
index c30256c53..8780503a0 100644
--- a/src/test/java/org/redisson/RedissonSetMultimapTest.java
+++ b/src/test/java/org/redisson/RedissonSetMultimapTest.java
@@ -131,6 +131,22 @@ public class RedissonSetMultimapTest extends BaseTest {
         assertThat(s).isEmpty();
         assertThat(map.size()).isEqualTo(0);
     }
+    
+    @Test
+    public void testKeySize() {
+        RSetMultimap<SimpleKey, SimpleValue> map = redisson.getSetMultimap("test1");
+        map.put(new SimpleKey("0"), new SimpleValue("1"));
+        map.put(new SimpleKey("0"), new SimpleValue("2"));
+        map.put(new SimpleKey("1"), new SimpleValue("3"));
+
+        assertThat(map.size()).isEqualTo(2);
+
+        map.fastRemove(new SimpleKey("0"));
+
+        Set<SimpleValue> s = map.get(new SimpleKey("0"));
+        assertThat(s).isEmpty();
+        assertThat(map.size()).isEqualTo(1);
+    }
 
     @Test
     public void testPut() {