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https://issues.apache.org/jira/browse/SPARK-21023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045472#comment-16045472
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Wenchen Fan commented on SPARK-21023:
-------------------------------------
can't we just introduce something like `--extra-properties-file` for this new
feature?
> Ignore to load default properties file is not a good choice from the
> perspective of system
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-21023
> URL: https://issues.apache.org/jira/browse/SPARK-21023
> Project: Spark
> Issue Type: Improvement
> Components: Spark Submit
> Affects Versions: 2.1.1
> Reporter: Lantao Jin
> Priority: Minor
>
> The default properties file {{spark-defaults.conf}} shouldn't be ignore to
> load even though the submit arg {{--properties-file}} is set. The reasons are
> very easy to see:
> * Infrastructure team need continually update the {{spark-defaults.conf}}
> when they want set something as default for entire cluster as a tuning
> purpose.
> * Application developer only want to override the parameters they really want
> rather than others they even doesn't know (Set by infrastructure team).
> * The purpose of using {{\-\-properties-file}} from most of application
> developers is to avoid setting dozens of {{--conf k=v}}. But if
> {{spark-defaults.conf}} is ignored, the behaviour becomes unexpected finally.
> For example:
> Current implement
> ||Property name||Value in default||Value in user-special||Finally value||
> |spark.A|"foo"|"bar"|"bar"|
> |spark.B|"foo"|N/A|N/A|
> |spark.C|N/A|"bar"|"bar"|
> |spark.D|"foo"|"foo"|"foo"|
> |spark.E|"foo"|N/A|N/A|
> |spark.F|"foo"|N/A|N/A|
> Expected right implement
> ||Property name||Value in default||Value in user-special||Finally value||
> |spark.A|"foo"|"bar"|"bar"|
> |spark.B|"foo"|N/A|"foo"|
> |spark.C|N/A|"bar"|"bar"|
> |spark.D|"foo"|"foo"|"foo"|
> |spark.E|"foo"|"foo"|"foo"|
> |spark.F|"foo"|"foo"|"foo"|
> I can offer a patch to fix it if you think it make sense.
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