Fixed - an error shouldn't appear if Redisson successfully got the information at least from one sentinel/cluster server. #1366

redisson/src/main/java/org/redisson/cluster/ClusterConnectionManager.java

@@ -347,7 +347,9 @@ public class ClusterConnectionManager extends MasterSlaveConnectionManager {
 
     private void checkClusterState(final ClusterServersConfig cfg, final Iterator<URI> iterator, final AtomicReference<Throwable> lastException) {
         if (!iterator.hasNext()) {
-            log.error("Can't update cluster state", lastException.get());
+            if (lastException.get() != null) {
+                log.error("Can't update cluster state", lastException.get());
+            }
             scheduleClusterChangeCheck(cfg, null);
             return;
         }

redisson/src/main/java/org/redisson/connection/SentinelConnectionManager.java

@@ -248,7 +248,9 @@ public class SentinelConnectionManager extends MasterSlaveConnectionManager {
 
     private void checkState(final SentinelServersConfig cfg, final Iterator<RedisClient> iterator, final AtomicReference<Throwable> lastException) {
         if (!iterator.hasNext()) {
-            log.error("Can't update cluster state", lastException.get());
+            if (lastException.get() != null) {
+                log.error("Can't update cluster state", lastException.get());
+            }
             scheduleChangeCheck(cfg, null);
             return;
         }