jfrazee commented on pull request #4753:
URL: https://github.com/apache/nifi/pull/4753#issuecomment-761122050


   @thenatog I've been able to verify that this is functional, both for the 
cluster and state management, but there's some behavioral stuff I want to 
sanity check. I don't think the intent of the code is to require doing either 
of these, but right now:
   
   * TLS is required for the embedded ZK when cluster TLS is enabled but NiFi 
won't try to connect securely unless `nifi.zookeeper.client.secure` is set to 
true in nifi.properties.
   * Similarly, the embedded ZK won't actually run with TLS enabled unless 
`secureClientPort` is set in zookeeper.properties. It appears that `clientPort` 
is successfully removed but `secureClientPort` doesn't get added.
   
   Am I doing something wrong or is this the intended behavior? There are pros 
to not ignoring or overriding configuring but I think the upgrade is going to 
be frustrating and we might need to be warning more loudly.
   
   Just to re-up the discussion in one of the JIRAs, these were suggested for 
the embedded server. You have most of this but I'm having trouble validating 
the first and last bullet points.
   
   * NiFi restricts embedded ZK to only allow TLS connections if TLS configs 
are provided, avoiding the surprise to the user even if both options are 
supported simultaneously given the provided server configuration 
secureClientPort and clientPort (this property is exposed by default in our 
zookeeper.properties template)
   * Add comments in zookeeper.properties template explaining the ports are 
mutually exclusive for embedded NiFi ZK
   * Add docs in Admin Guide explaining changes from normal ZK operation
   * Clarify that an external ZK is preferred but embedded ZK is provided as 
accelerator only (similar to TLS TK)
   * Detect conflicting config & warn loudly but continue with TLS only
   
   


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