If you do not remove the specific key of name2entry, it will cause memory leak. Please review.

Signed-off-by: soon85.choi <soon85.choi@samsung.com>

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

@@ -475,8 +475,8 @@ public class PublishSubscribeService {
     }
 
     public CompletableFuture<Void> unsubscribeLocked(PubSubType topicType, ChannelName channelName) {
-        Collection<MasterSlaveEntry> coll = name2entry.getOrDefault(channelName, Collections.emptySet());
-        if (coll.isEmpty()) {
+        Collection<MasterSlaveEntry> coll = name2entry.remove(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<Void> promise = new CompletableFuture<>();
             promise.completeExceptionally(ex);
@@ -544,8 +544,8 @@ public class PublishSubscribeService {
     }
 
     public CompletableFuture<Codec> unsubscribe(ChannelName channelName, PubSubType topicType) {
-        Collection<MasterSlaveEntry> coll = name2entry.getOrDefault(channelName, Collections.emptySet());
-        if (coll.isEmpty()) {
+        Collection<MasterSlaveEntry> coll = name2entry.remove(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<>();
             promise.completeExceptionally(ex);
@@ -762,8 +762,8 @@ public class PublishSubscribeService {
         }, timeout, TimeUnit.MILLISECONDS);
 
         return sf.thenCompose(res -> {
-            Collection<MasterSlaveEntry> entries = name2entry.getOrDefault(channelName, Collections.emptySet());
-            if (entries.isEmpty()) {
+            Collection<MasterSlaveEntry> entries = name2entry.remove(channelName);
+            if (entries == null || entries.isEmpty()) {
                 semaphore.release();
                 return CompletableFuture.completedFuture(null);
             }