How can i remove registered host but do not added.

[#1]

My cluster have registered hosts but do not added on cluster.

It means that,

I was installed ambari-agent on some hosts.

This hosts registered to ambari-server by changing server hostname on amber-agent.ini

But, I didn't registered on cluster using ambari web UI.

Some times later, when i was checked ambari-server log, ambari server still check this host's heartbeat.

"WARN [ambari-hearbeat-monitor] HeartbeatMonitor:154 - Heartbeat lost from host hostname"

how can i remove this hosts?

[#2]

You could remove via delete statement in psql..

1) Removing table entries in hoststate : Delete from hoststate where host_id=xx

2) Removing table entries from hosts : Delete from hosts where host_id=xx

And restart ambari-server

thx. It works.

[#3]

You could remove via delete statement in psql..

1) Removing table entries in hoststate : Delete from hoststate where host_id=xx

2) Removing table entries from hosts : Delete from hosts where host_id=xx

And restart ambari-server

[#4]

I restarted the ambari-agent services and was able to reregister we also have an option of ambari-agent reset hdp_server_name this was also required on other 2 hosts