[AMBARI-25492] Ambari Sends Empty metrics_collector_hosts parameters after AMS service is deleted

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.7.5
• Component/s: ambari-server
• Labels: pull-request-available
• Assignee: Akhil Naik
• Reporter: Akhil Naik
• Created: 05/Mar/20 08:06
• Updated: 29/Sep/22 06:29

Description

I am having an cluster where Ambari metrics collector was installed and removed later as they dont use it . Now there Nifi fails to start due to script error :

----
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 304, in <module>
    Master().execute()
  File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 352, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/nifi.py", line 139, in start
    import params
  File "/var/lib/ambari-agent/cache/common-services/NIFI/1.0.0/package/scripts/params.py", line 302, in <module>
    metrics_collector_host = str(config['clusterHostInfo']['metrics_collector_hosts'][0])
IndexError: list index out of range
----

Issue is easy to reproduce

1) Deploy a fresh cluster with HDF
2) Remove AMS service
3) try to start/stop or restart nifi service. it will fail with abouve error.

Issue Links

• links to: GitHub PR#3189
• links to: GitHub Pull Request #3189