ts_ambari8

Author: dagiro

articles/hdinsight/hdinsight-scaling-best-practices.md

@@ -6,7 +6,7 @@ ms.author: ashish
 ms.reviewer: jasonh
 ms.service: hdinsight
 ms.topic: conceptual
-ms.date: 11/22/2019
+ms.date: 02/05/2020
 ---
 
 # Scale Azure HDInsight clusters
@@ -212,6 +212,10 @@ If your clusters get stuck in safe mode frequently when scaling down to fewer th
 
 Retaining three worker nodes is more costly than scaling down to only one worker node, but it will prevent your cluster from getting stuck in safe mode.
 
+### Scale HDInsight down to one worker node
+
+Even when the cluster is scaled down to 1 node, worker node 0 will still survive. Worker node 0 can never be decommissioned.
+
 #### Run the command to leave safe mode
 
 The final option is to execute the leave safe mode command. If you know that the reason for HDFS entering safe mode is because of Hive file under-replication, you can execute the following command to leave safe mode: