Github user hunglin commented on a diff in the pull request: https://github.com/apache/spark/pull/5124#discussion_r27305215 --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala --- @@ -474,13 +477,13 @@ class SparkContext(config: SparkConf) extends Logging with ExecutorAllocationCli * Spark fair scheduler pool. */ def setLocalProperty(key: String, value: String) { - if (localProperties.get() == null) { - localProperties.set(new Properties()) + if (localProperties.get().isEmpty) { + localProperties.set(Some(new Properties())) --- End diff -- @JoshRosen the idea is to use Option so compiler can help us prevent NullPointerException. And by eagerly setting localProperties to None, localProperties won't be null. As a contributor, when I see the type is Option[Properties], I know I'm safe from NPE, because I might not aware of the eagerly setting to empty Properties somewhere in the codes, and end up putting all ```if (localProperties.get != null)``` code everywhere. If we can change DeveloperApi, I would like to change all ```properties = null``` to Option. That's just my 2 cents, I'm more than happy to discuss and listen to your thoughts.
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