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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