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https://issues.apache.org/jira/browse/SPARK-2499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062912#comment-14062912
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Mark Wagner commented on SPARK-2499:
------------------------------------
Travis, spark-default.conf is loaded as a Properties object in
SparkSubmitArguments.scala so this is just behavior inherited from that. Would
you be okay with just having comments before settings (which I think is the
standard for .properties files)?
> spark-default.conf parser doesn't ignore inline comments
> --------------------------------------------------------
>
> Key: SPARK-2499
> URL: https://issues.apache.org/jira/browse/SPARK-2499
> Project: Spark
> Issue Type: Bug
> Affects Versions: 1.0.1
> Reporter: Travis Thompson
>
> If you add a comment to spark-default.conf at the end of a line, spark will
> try to parse it, example:
> spark-default.conf
> {noformat}
> spark.ui.port=0 # This forces the webui to always start on a random port
> {noformat}
> Error:
> {noformat}
> java.lang.NumberFormatException: For input string: "0 # This forces the webui
> to always start on a random port"
> {noformat}
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