Paul Rogers created DRILL-4564:
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             Summary: Add documentation detail regarding start-up properties 
hierarchy
                 Key: DRILL-4564
                 URL: https://issues.apache.org/jira/browse/DRILL-4564
             Project: Apache Drill
          Issue Type: Improvement
          Components: Documentation
            Reporter: Paul Rogers
            Priority: Minor


We’ve been having a lively discussion about config options. We might want to 
summarize the discussion in DRILL-4543. Current text:

At the core of the file hierarchy is drill-default.conf. This file is 
overridden by one or more drill-module.conf files, which are overridden by the 
drill-override.conf file that you define.

Possible revision:

At the bottom of the hierarchy are the default files that Drill itself 
provides. The first is drill-default.conf. This file is overridden by one or 
more drill-module.conf files provided by Drill’s internal modules. These are 
overridden by the drill-override.conf file that you define. Finally, you can 
provide overrides on each Drill-bit using system properties of the form 
-Dname=value passed on the command line:

./drillbit.sh start -Dname=value



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