Hi@Manoj690 ,   Seems your AMS hbase master is not able to start -     Please try below steps -   In the Ambari Dashboard, go to the 'Ambari Metrics' section and under the 'Service Actions' dropdown click 'Stop'.  Check and confirm from backend that ams process is stopped. If the process is still running use below command to stop - # ambari-metrics-collector stop Delete all AMS Hbase data - In the Ambari Dashboard, under the Ambari Metrics section do a search for the following configuration values  "hbase.rootdir" Remove entire files from “hbase.rootdir” Eg.  #hdfs dfs -cp  /user/ams/hbase/* /tmp/         #hdfs dfs -rm -r -skipTrash  /user/ams/hbase/* In the Ambari Dashboard, under the Ambari Metrics section do a search for the following configuration values  “hbase.tmp.dir”. Backup the directory and remove the data. Eg. #cp /var/lib/ambari-metrics-collector/hbase-tmp/*  /tmp/        #rm –fr /var/lib/ambari-metrics-collector/hbase-tmp/* Remove the znode for hbase in zookeeper cli Login to ambari UI -> Ambari Metrics -> Configs -> Advance ams-hbase-site and search for property  “zookeeper.znode.parent” #/usr/hdp/current/zookeeper-client/bin/zkCli.sh #rmr /ams-hbase-secure   Start AMS   Let know if you still have issue   ... View more

Hi@Manoj690    1.  First check which is the directory configured for dfs data storage. Login to Ambari UI -> Services-> HDFS -> Configs -> [search for dfs.datanode.data.dir] Capture this list of directories defined here. EG. i have list as below - /data01/hadoop/hdfs/data,/data02/hadoop/hdfs/data 2. Login to the datanodes and go to the mount. In my case- $cd /data01/hadoop/hdfs/ 3. Check if there is any directory/data inside "/data01/hadoop/hdfs/" or "/data01/" 4. Other data than "**data" is consider as nondfs and which will show you in dfsadmin -report. 5. You need to get rid of those data which will lesser your NON DFS used.   You can share your output if you have any confusion/need help.   ... View more

@mike_bronson7  you just need to backup /hadoop/hdfs/namenode/current from active namenode   Also if you backup one week earlier the activity and lets say your first cluster is going serve more request to clients then you will loose that data which was written after backup. So best is to do savenamespace and backup when you are going to do activity and freeze clients not accessing the cluster.   ... View more