Hi,
For anyone still wondering about this warning, it can be solved by updating Metron Client version in ambari db running on your Ambari server host. Assuming postgres is used, you can find the DB port by running following one-liner:
PID=`ps -eaf | grep "postgres: ambari" | grep -v grep | awk '{print $3}' | uniq`; netstat -anp | grep $PID | grep PGSQL | tail -1 | awk '{print $NF}' | rev | cut -d'.' -f 1 | rev
Default is: 5432
Connect to DB on given port (default password for ambari user is 'bigdata'):
psql ambari -U ambari -W -p 5432
Find out what version does your Ambari expect (it should be your HDP version):
select version from hostcomponentstate where current_state='STARTED' and version NOT LIKE 'UNKNOWN' limit 1;
Check if the current Metro Client version is indeed 'unknown':
select * from hostcomponentstate where component_name='METRON_CLIENT';
Update Metron Client version with the version returned by the first query:
update hostcomponentstate set version = '2.6.5.1100-53' where component_name = 'METRON_CLIENT';
Restart Ambari server so it can pick up on changes
ambari-server restart
After the server is up and next check passes (default is every 5 minutes) the warning should clear out
