Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4111#discussion_r23337589
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -379,6 +379,41 @@ class SparkContext(config: SparkConf) extends Logging
with ExecutorAllocationCli
}
executorAllocationManager.foreach(_.start())
+ // Use reflection to instantiate listeners specified via the
`spark.extraListeners` configuration
+ // or the SPARK_EXTRA_LISTENERS environment variable
+ try {
+ val listenerClassNames: Seq[String] = {
+ val fromSparkConf = conf.get("spark.extraListeners", "").split(',')
+ val fromEnvVar =
Option(conf.getenv("SPARK_EXTRA_LISTENERS")).getOrElse("").split(',')
--- End diff --
This functions slightly differently than the rest of our env-based
configurations: the settings from this configuration are merged with the
SparkConf configuration, rather than overriding/being-overriden by it. My
motivation for this configuration was to provide a mechanism for the execution
environment to inject custom listeners without having to worry about them being
overriden by settings in the user's SparkConf (this is necessary because we
don't have a mechanism for automatic merging of Spark configurations).
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