Docs - Add note about adding *-conf.xml files to Spark conf directory to help with Kerberos configuration

Docs - Add note about adding *-conf.xml files to Spark conf directory to help with Kerberos configuration

Original JIRA Issue: https://geomesa.atlassian.net/browse/GEOMESA-2901

Key: GEOMESA-2901
Type: Improvement
Priority: Major
Status: To Do
Resolution: Unresolved
Reporter: James Hughes
Created: Thu, 27 Aug 2020 09:01:08 -0400
Updated: Wed, 28 Dec 2022 16:30:47 -0500
Affects Version(s): 3.0.0

Comments:

557058:da7f6dfa-f0a1-468b-aec5-2cb61273feb5 (Thu, 27 Aug 2020 09:08:06 -0400):

related, we should add a check for missing geomesa principal keys in the conf so that the error message isn't an NPE:
java.lang.NullPointerException
at org.locationtech.geomesa.hbase.data.HBaseConnectionPool$.sameName(HBaseConnectionPool.scala:189)
at org.locationtech.geomesa.hbase.data.HBaseConnectionPool$.configureSecurity(HBaseConnectionPool.scala:159)

557058:48912df4-0004-4f90-9915-db26684ec006 (Mon, 8 Mar 2021 16:23:10 -0500):

Emilio Lahr-Vivaz did your recent Kerberos work address this by chance?

557058:da7f6dfa-f0a1-468b-aec5-2cb61273feb5 (Mon, 8 Mar 2021 16:24:40 -0500):

not the docs work, it resolved the comment on the NPE.

The issue names no documentation file or test. Start by locating the Spark configuration documentation and its guidance for the conf directory, then add the note about *-conf.xml files and Kerberos configuration. Done means the relevant documentation clearly explains where these files belong and how they support Kerberos setup.