diff --git a/lettuce/pom.xml b/lettuce/pom.xml
index 0a51aa8068..591b1f42a7 100644
--- a/lettuce/pom.xml
+++ b/lettuce/pom.xml
@@ -93,6 +93,13 @@
             <version>1.2.17</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisAsyncConnectionImpl.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisAsyncConnectionImpl.java
index c929ae7877..08c4e911a9 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisAsyncConnectionImpl.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisAsyncConnectionImpl.java
@@ -204,6 +204,11 @@ public void debugSegfault() {
         dispatch(commandBuilder.debugSegfault());
     }
 
+    @Override
+    public void debugOom() {
+        dispatch(commandBuilder.debugOom());
+    }
+
     @Override
     public RedisFuture<Long> decr(K key) {
         return dispatch(commandBuilder.decr(key));
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisCommandBuilder.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisCommandBuilder.java
index 9049b3d901..ad641d1d6a 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisCommandBuilder.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisCommandBuilder.java
@@ -167,6 +167,11 @@ public Command<K, V, Void> debugSegfault() {
         return createCommand(DEBUG, null, args);
     }
 
+    public Command<K, V, Void> debugOom() {
+        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("OOM");
+        return createCommand(DEBUG, null, args);
+    }
+
     public Command<K, V, Long> decr(K key) {
         return createCommand(DECR, new IntegerOutput<K, V>(codec), key);
     }
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnection.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnection.java
index 42b94f55f5..e942a47c37 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnection.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnection.java
@@ -2,6 +2,7 @@
 
 import java.io.Closeable;
 import java.net.SocketAddress;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Future;
 
@@ -23,6 +24,13 @@ public interface RedisSentinelAsyncConnection<K, V> extends Closeable {
      */
     Future<SocketAddress> getMasterAddrByName(K key);
 
+    /**
+     * Enumerates all the monitored masters and their states.
+     * 
+     * @return RedisFuture&lt;Map&lt;K, V&gt;&gt;
+     */
+    RedisFuture<List<Map<K, V>>> masters();
+
     /**
      * Show the state and info of the specified master.
      * 
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnectionImpl.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnectionImpl.java
index 91c5fac080..58039b1c77 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnectionImpl.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisSentinelAsyncConnectionImpl.java
@@ -52,6 +52,12 @@ public SocketAddress apply(List<V> input) {
         return result;
     }
 
+    @Override
+    public RedisFuture<List<Map<K, V>>> masters() {
+
+        return dispatch(commandBuilder.masters());
+    }
+
     @Override
     public RedisFuture<Map<K, V>> master(K key) {
 
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisServerAsyncConnection.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisServerAsyncConnection.java
index 42409a45da..d747283889 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisServerAsyncConnection.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisServerAsyncConnection.java
@@ -114,10 +114,15 @@ public interface RedisServerAsyncConnection<K, V> {
     RedisFuture<String> debugObject(K key);
 
     /**
-     * Make the server crash.
+     * Make the server crash: Invalid pointer access.
      */
     void debugSegfault();
 
+    /**
+     * Make the server crash: Out of memory.
+     */
+    void debugOom();
+
     /**
      * Remove all keys from all databases.
      * 
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/RedisServerConnection.java b/lettuce/src/main/java/com/lambdaworks/redis/RedisServerConnection.java
index 9c98309f51..19b1a367fb 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/RedisServerConnection.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/RedisServerConnection.java
@@ -114,10 +114,15 @@ public interface RedisServerConnection<K, V> {
     String debugObject(K key);
 
     /**
-     * Make the server crash.
+     * Make the server crash: Invalid pointer access.
      */
     void debugSegfault();
 
+    /**
+     * Make the server crash: Out of memory.
+     */
+    void debugOom();
+
     /**
      * Remove all keys from all databases.
      * 
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/SentinelCommandBuilder.java b/lettuce/src/main/java/com/lambdaworks/redis/SentinelCommandBuilder.java
index 3c7e3e8f87..846462077e 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/SentinelCommandBuilder.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/SentinelCommandBuilder.java
@@ -1,5 +1,8 @@
 package com.lambdaworks.redis;
 
+import static com.lambdaworks.redis.protocol.CommandKeyword.FAILOVER;
+import static com.lambdaworks.redis.protocol.CommandKeyword.RESET;
+import static com.lambdaworks.redis.protocol.CommandKeyword.SLAVES;
 import static com.lambdaworks.redis.protocol.CommandType.MONITOR;
 import static com.lambdaworks.redis.protocol.CommandType.PING;
 import static com.lambdaworks.redis.protocol.CommandType.SENTINEL;
@@ -10,6 +13,7 @@
 
 import com.lambdaworks.redis.codec.RedisCodec;
 import com.lambdaworks.redis.output.IntegerOutput;
+import com.lambdaworks.redis.output.ListOfMapsOutput;
 import com.lambdaworks.redis.output.MapOutput;
 import com.lambdaworks.redis.output.StatusOutput;
 import com.lambdaworks.redis.output.ValueListOutput;
@@ -31,23 +35,28 @@ public Command<K, V, List<V>> getMasterAddrByKey(K key) {
         return createCommand(SENTINEL, new ValueListOutput<K, V>(codec), args);
     }
 
+    public Command<K, V, List<Map<K, V>>> masters() {
+        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("masters");
+        return createCommand(SENTINEL, new ListOfMapsOutput<K, V>(codec), args);
+    }
+
     public Command<K, V, Map<K, V>> master(K key) {
         CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("master").addKey(key);
         return createCommand(SENTINEL, new MapOutput<K, V>(codec), args);
     }
 
     public Command<K, V, Map<K, V>> slaves(K key) {
-        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("slaves").addKey(key);
+        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add(SLAVES).addKey(key);
         return createCommand(SENTINEL, new MapOutput<K, V>(codec), args);
     }
 
     public Command<K, V, Long> reset(K key) {
-        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("reset").addKey(key);
+        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add(RESET).addKey(key);
         return createCommand(SENTINEL, new IntegerOutput<K, V>(codec), args);
     }
 
     public Command<K, V, String> failover(K key) {
-        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add("failover").addKey(key);
+        CommandArgs<K, V> args = new CommandArgs<K, V>(codec).add(FAILOVER).addKey(key);
         return createCommand(SENTINEL, new StatusOutput<K, V>(codec), args);
     }
 
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/output/ListOfMapsOutput.java b/lettuce/src/main/java/com/lambdaworks/redis/output/ListOfMapsOutput.java
new file mode 100644
index 0000000000..7f855e034d
--- /dev/null
+++ b/lettuce/src/main/java/com/lambdaworks/redis/output/ListOfMapsOutput.java
@@ -0,0 +1,60 @@
+// Copyright (C) 2011 - Will Glozer.  All rights reserved.
+
+package com.lambdaworks.redis.output;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.lambdaworks.redis.codec.RedisCodec;
+import com.lambdaworks.redis.protocol.CommandOutput;
+
+/**
+ * {@link java.util.List} of maps output.
+ * 
+ * @param <K> Key type.
+ * @param <V> Value type.
+ * 
+ * @author Will Glozer
+ */
+public class ListOfMapsOutput<K, V> extends CommandOutput<K, V, List<Map<K, V>>> {
+    private MapOutput<K, V> nested;
+    private int mapCount = -1;
+    private List<Integer> counts = new ArrayList<Integer>();
+
+    public ListOfMapsOutput(RedisCodec<K, V> codec) {
+        super(codec, new ArrayList<Map<K, V>>());
+        nested = new MapOutput<K, V>(codec);
+    }
+
+    @Override
+    public void set(ByteBuffer bytes) {
+        nested.set(bytes);
+    }
+
+    @Override
+    public void complete(int depth) {
+
+        if (counts.size() > 0) {
+            int expectedSize = counts.get(0);
+
+            if (nested.get().size() == expectedSize) {
+                counts.remove(0);
+                output.add(new HashMap<K, V>(nested.get()));
+                nested.get().clear();
+            }
+        }
+    }
+
+    @Override
+    public void multi(int count) {
+        if (mapCount == -1) {
+            mapCount = count;
+        } else {
+            // div 2 because of key value pair counts twice
+            counts.add(count / 2);
+        }
+    }
+}
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/protocol/CommandOutput.java b/lettuce/src/main/java/com/lambdaworks/redis/protocol/CommandOutput.java
index 9744496282..a763d18b00 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/protocol/CommandOutput.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/protocol/CommandOutput.java
@@ -122,4 +122,8 @@ public String toString() {
         sb.append(']');
         return sb.toString();
     }
+
+    public void multi(int count) {
+
+    }
 }
diff --git a/lettuce/src/main/java/com/lambdaworks/redis/protocol/RedisStateMachine.java b/lettuce/src/main/java/com/lambdaworks/redis/protocol/RedisStateMachine.java
index 631aec7942..c9df9664ee 100644
--- a/lettuce/src/main/java/com/lambdaworks/redis/protocol/RedisStateMachine.java
+++ b/lettuce/src/main/java/com/lambdaworks/redis/protocol/RedisStateMachine.java
@@ -142,6 +142,7 @@ public boolean decode(ByteBuf buffer, RedisCommand<K, V, ?> command, CommandOutp
                         length = (int) readLong(buffer, buffer.readerIndex(), end);
                         state.count = length;
                         buffer.markReaderIndex();
+                        output.multi(state.count);
                     }
 
                     if (state.count <= 0) {
@@ -150,6 +151,7 @@ public boolean decode(ByteBuf buffer, RedisCommand<K, V, ?> command, CommandOutp
 
                     state.count--;
                     stack.addFirst(new State());
+
                     continue loop;
                 case BYTES:
                     if ((bytes = readBytes(buffer, state.count)) == null) {
diff --git a/lettuce/src/test/java/com/lambdaworks/redis/SentinelCommandTest.java b/lettuce/src/test/java/com/lambdaworks/redis/SentinelCommandTest.java
index 08bb08e21f..ec1f166a9d 100644
--- a/lettuce/src/test/java/com/lambdaworks/redis/SentinelCommandTest.java
+++ b/lettuce/src/test/java/com/lambdaworks/redis/SentinelCommandTest.java
@@ -3,11 +3,14 @@
 package com.lambdaworks.redis;
 
 import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.Matchers.greaterThan;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Future;
 
@@ -63,6 +66,21 @@ public void getSlaveAddr() throws Exception {
 
     }
 
+    @Test
+    public void masters() throws Exception {
+
+        Future<List<Map<String, String>>> result = sentinel.masters();
+        List<Map<String, String>> list = result.get();
+
+        assertThat(list.size(), greaterThan(0));
+
+        Map<String, String> map = list.get(0);
+        assertNotNull(map.get("flags"));
+        assertNotNull(map.get("config-epoch"));
+        assertNotNull(map.get("port"));
+
+    }
+
     @Test
     public void getSlaveDownstate() throws Exception {