Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19419#discussion_r142409684
--- Diff: conf/spark-defaults.conf.template ---
@@ -19,9 +19,16 @@
# This is useful for setting default environmental settings.
# Example:
-# spark.master spark://master:7077
-# spark.eventLog.enabled true
-# spark.eventLog.dir hdfs://namenode:8021/directory
-# spark.serializer
org.apache.spark.serializer.KryoSerializer
-# spark.driver.memory 5g
-# spark.executor.extraJavaOptions -XX:+PrintGCDetails -Dkey=value
-Dnumbers="one two three"
+# spark.master spark://master:7077
+# spark.eventLog.enabled true
+# spark.eventLog.dir hdfs://namenode:8021/directory
+# spark.serializer
org.apache.spark.serializer.KryoSerializer
+# spark.driver.memory 5g
+# spark.executor.extraJavaOptions -XX:+PrintGCDetails -Dkey=value
-Dnumbers="one two three"
+
+#spark.ui.allowFramingFrom https://example.com/
+#spark.ui.xXssProtection.enabled 1; mode=block
--- End diff --
This sounds like a boolean flag but its value isn't boolean; if it has only
one reasonable value then it can be a boolean that sets that value. Otherwise
maybe call the property something else
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