https://community.cloudera.com/t5/Support-Questions/DATA-NODE-was-removed-from-Ambari-Due-to-Rackwareness/m-p/206918#M168879 <P>Check your rack setting for the DataNode. If you don't see the problem you can post the output of the following command and someone may be able to point out the error.</P><PRE>hdfs dfsadmin -report</PRE> Mon, 24 Apr 2017 03:43:17 GMT ArpitAgarwal 2017-04-24T03:43:17Z