Fixed - name2entry.remove() invocation should be guarded by lock

redisson/src/main/java/org/redisson/pubsub/PublishSubscribeService.java

@@ -544,7 +544,7 @@ public class PublishSubscribeService {
     }
 
     public CompletableFuture<Codec> unsubscribe(ChannelName channelName, PubSubType topicType) {
-        Collection<MasterSlaveEntry> coll = name2entry.remove(channelName);
+        Collection<MasterSlaveEntry> coll = name2entry.get(channelName);
         if (coll == null || coll.isEmpty()) {
             RedisNodeNotFoundException ex = new RedisNodeNotFoundException("Node for name: " + channelName + " hasn't been discovered yet. Check cluster slots coverage using CLUSTER NODES command. Increase value of retryAttempts and/or retryInterval settings.");
             CompletableFuture<Codec> promise = new CompletableFuture<>();
@@ -563,6 +563,7 @@ public class PublishSubscribeService {
         AsyncSemaphore lock = getSemaphore(channelName);
         CompletableFuture<Void> f = lock.acquire();
         return f.thenCompose(v -> {
+            name2entry.remove(channelName);
             PubSubConnectionEntry entry = name2PubSubConnection.remove(new PubSubKey(channelName, e));
             if (entry == null) {
                 lock.release();