Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/2696#discussion_r18863745
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -229,10 +233,26 @@ class SparkContext(config: SparkConf) extends Logging
{
private[spark] val metadataCleaner =
new MetadataCleaner(MetadataCleanerType.SPARK_CONTEXT, this.cleanup,
conf)
- // Initialize the Spark UI, registering all associated listeners
+
+ private[spark] val environmentListener = new EnvironmentListener
--- End diff --
The idea here is to use this listeners to maintain state that's used in
both the web UI and the progress / status APIs. Users can disable the web UI
but might still want to use the progress APIs, so these listeners can't be
created / owned by the web UI.
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