diff --git a/src/main/java/org/redisson/command/CommandAsyncService.java b/src/main/java/org/redisson/command/CommandAsyncService.java
index d0b2fa106..4a27eb612 100644
--- a/src/main/java/org/redisson/command/CommandAsyncService.java
+++ b/src/main/java/org/redisson/command/CommandAsyncService.java
@@ -21,6 +21,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -181,10 +182,11 @@ public class CommandAsyncService implements CommandAsyncExecutor {
         return allAsync(true, command, callback, params);
     }
 
-    public <T, R> Future<R> allAsync(boolean readOnlyMode, RedisCommand<T> command, final SlotCallback<T, R> callback, Object ... params) {
+    private <T, R> Future<R> allAsync(boolean readOnlyMode, RedisCommand<T> command, final SlotCallback<T, R> callback, Object ... params) {
         final Promise<R> mainPromise = connectionManager.newPromise();
+        final Set<ClusterSlotRange> slots = connectionManager.getEntries().keySet();
         Promise<T> promise = new DefaultPromise<T>() {
-            AtomicInteger counter = new AtomicInteger(connectionManager.getEntries().keySet().size());
+            AtomicInteger counter = new AtomicInteger(slots.size());
             @Override
             public Promise<T> setSuccess(T result) {
                 if (callback != null) {
@@ -206,7 +208,7 @@ public class CommandAsyncService implements CommandAsyncExecutor {
                 return this;
             }
         };
-        for (ClusterSlotRange slot : connectionManager.getEntries().keySet()) {
+        for (ClusterSlotRange slot : slots) {
             async(readOnlyMode, new NodeSource(slot.getStartSlot()), connectionManager.getCodec(), command, params, promise, 0);
         }
         return mainPromise;