RKeys.deleteAsync wasn't worked in cluster mode. Fixed.

src/main/java/org/redisson/RedissonKeys.java

@@ -18,20 +18,28 @@ package org.redisson;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
 import java.util.NoSuchElementException;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
 
+import org.redisson.client.RedisException;
 import org.redisson.client.codec.StringCodec;
 import org.redisson.client.protocol.RedisCommands;
 import org.redisson.client.protocol.decoder.ListScanResult;
 import org.redisson.cluster.ClusterSlotRange;
 import org.redisson.command.CommandAsyncExecutor;
+import org.redisson.command.CommandBatchService;
 import org.redisson.core.RKeys;
 import org.redisson.misc.CompositeIterable;
 
 import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.FutureListener;
+import io.netty.util.concurrent.Promise;
 
 public class RedissonKeys implements RKeys {
 
@@ -228,7 +236,7 @@ public class RedissonKeys implements RKeys {
      * Delete multiple objects by name
      *
      * @param keys - object names
-     * @return
+     * @return number of removed keys
      */
     @Override
     public long delete(String ... keys) {
@@ -239,22 +247,68 @@ public class RedissonKeys implements RKeys {
      * Delete multiple objects by name in async mode
      *
      * @param keys - object names
-     * @return
+     * @return number of removed keys
      */
     @Override
     public Future<Long> deleteAsync(String ... keys) {
-        return commandExecutor.writeAllAsync(RedisCommands.DEL, new SlotCallback<Long, Long>() {
-            AtomicLong results = new AtomicLong();
-            @Override
-            public void onSlotResult(Long result) {
-                results.addAndGet(result);
+        Map<ClusterSlotRange, List<String>> range2key = new HashMap<ClusterSlotRange, List<String>>();
+        for (String key : keys) {
+            int slot = commandExecutor.getConnectionManager().calcSlot(key);
+            for (ClusterSlotRange range : commandExecutor.getConnectionManager().getEntries().keySet()) {
+                if (range.isOwn(slot)) {
+                    List<String> list = range2key.get(range);
+                    if (list == null) {
+                        list = new ArrayList<String>();
+                        range2key.put(range, list);
+                    }
+                    list.add(key);
+                }
             }
+        }
 
+        final Promise<Long> result = commandExecutor.getConnectionManager().newPromise();
+        final AtomicReference<Throwable> failed = new AtomicReference<Throwable>();
+        final AtomicLong count = new AtomicLong();
+        final AtomicLong executed = new AtomicLong(range2key.size());
+        FutureListener<List<?>> listener = new FutureListener<List<?>>() {
             @Override
-            public Long onFinish() {
-                return results.get();
+            public void operationComplete(Future<List<?>> future) throws Exception {
+                if (future.isSuccess()) {
+                    List<Long> result = (List<Long>) future.get();
+                    for (Long res : result) {
+                        count.addAndGet(res);
+                    }
+                } else {
+                    failed.set(future.cause());
+                }
+
+                if (executed.decrementAndGet() == 0) {
+                    if (failed.get() != null) {
+                        if (count.get() > 0) {
+                            RedisException ex = new RedisException("" + count.get() + " keys deleted. But one or more nodes has an error", failed.get());
+                            result.setFailure(ex);
+                        } else {
+                            result.setFailure(failed.get());
+                        }
+                    } else {
+                        result.setSuccess(count.get());
+                    }
+                }
             }
-        }, (Object[])keys);
+        };
+
+        for (Entry<ClusterSlotRange, List<String>> entry : range2key.entrySet()) {
+            // executes in batch due to CROSSLOT error
+            CommandBatchService executorService = new CommandBatchService(commandExecutor.getConnectionManager());
+            for (String key : entry.getValue()) {
+                executorService.writeAsync(entry.getKey().getStartSlot(), null, RedisCommands.DEL, key);
+            }
+
+            Future<List<?>> future = executorService.executeAsync();
+            future.addListener(listener);
+        }
+
+        return result;
     }
 
     @Override