HDFS-15799. Make DisallowedDatanodeException terse. Contributed by Richard Ross.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java

@@ -225,6 +225,7 @@ import org.slf4j.Logger;
 
 import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
 import org.apache.hadoop.thirdparty.protobuf.BlockingService;
+import org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException;
 
 import javax.annotation.Nonnull;
 
@@ -530,7 +531,8 @@ public class NameNodeRpcServer implements NamenodeProtocols {
         QuotaByStorageTypeExceededException.class,
         AclException.class,
         FSLimitException.PathComponentTooLongException.class,
-        FSLimitException.MaxDirectoryItemsExceededException.class);
+        FSLimitException.MaxDirectoryItemsExceededException.class,
+        DisallowedDatanodeException.class);
 
     clientRpcServer.addSuppressedLoggingExceptions(StandbyException.class,
         UnresolvedPathException.class);