We have Ambari HDP cluster ( HDP version - 2.6.4 ) , with 420 workers linux machines ( when each worker include data node and node manager service )
Unfortunately Ambari DB is damaged , and we not have Ambari DB dump , so we cant recover Ambari DB , so actually we not have Ambari and Ambari GUI
But HDFS disks on workers machines include HDFS data , and name node is still working with all data as ( journal/hdfsha/current/ ) and ( namenode/current )
So HDFS works without Ambari
So regarding what I said until now - it is possible install new Ambari cluster and then add existing working HDFS to the cluster ?
Dose hortonworks / cloudera have procedure for this process ?
An "Ambari cluster" is not something. You install Ambari agents and point the server at them.
If you wipe the database, then the agents may attempt to reconfigure your services, however, so you better take a backup of at least core-site.xml, hdfs-site.xml, yarn-site.xml, etc.