You can customize DC/OS Apache Spark in-place when it is up and running.
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Go to the DC/OS GUI.
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Click the Services tab, then the name of the Spark framework to be updated.
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Within the Spark instance details view, click the menu in the upper right, then choose Edit.
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In the dialog that appears, click the Environment tab and update any field(s) to their desired value(s).
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Click REVIEW & RUN to apply any changes and cleanly reload Spark.