Ishan Chattopadhyaya commented on SOLR-9541:

AFAIK, with the kerberos plugin enabled, all internode communication is done 
via Kerberos. Every solr node has a server principal and a client principal. To 
have it use PKI, we might need to add the support.

> Support configurable authentication mechanism for internode communication
> -------------------------------------------------------------------------
>                 Key: SOLR-9541
>                 URL: https://issues.apache.org/jira/browse/SOLR-9541
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 5.3, 6.0
>            Reporter: Hrishikesh Gadre
> SOLR-7849 introduced PKI based authentication mechanism for internode 
> communication. The main reason for introducing SOLR-7849 was,
> >> Relying on every Authentication plugin to secure the internode 
> >> communication is error prone. 
> At Cloudera we are using Kerberos protocol for all communication without any 
> issues (i.e. between client/server as well as server/server). We should make 
> this internode authentication mechanism configurable (with default as PKI 
> based mechanism). This will allow users to decide the appropriate 
> authentication mechanism based on their security requirements.

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