[jira] [Created] (AMBARI-24919) Allow Namenode HA setup with external namenodes in BlueprintConfigurationProcessor

["Balázs Bence Sári (JIRA)" <ji...@apache.org>]

Balázs Bence Sári created AMBARI-24919:
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             Summary: Allow Namenode HA setup with external namenodes in BlueprintConfigurationProcessor
                 Key: AMBARI-24919
                 URL: https://issues.apache.org/jira/browse/AMBARI-24919
             Project: Ambari
          Issue Type: Task
    Affects Versions: 2.7.2
            Reporter: Balázs Bence Sári
            Assignee: Balázs Bence Sári
             Fix For: trunk


There is an increasing demand for clusters with some of the components being managed externally to Ambari.

This ticket addresses the problem where the cluster contains a HDFS_CLIENT but server HDFS server components are external and NAMENODE is HA.

In this cases, cluster template validation failed as there were 0 name nodes which is less than the expected minimum of two.

Going forward the following setup should pass validation:
- Namenode HA is enabled
- There are 0 namenodes
- all namenode dfs rpc addresses point to an external fqdn.

This will give sufficent protection against accidentally omitted namenodes, however will enable clusters with external namenodes.



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