Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/42#discussion_r10238309
--- Diff: core/src/main/scala/org/apache/spark/ui/SparkUI.scala ---
@@ -17,38 +17,80 @@
package org.apache.spark.ui
+import java.io.{FileInputStream, File}
+
+import scala.io.Source
+
+import it.unimi.dsi.fastutil.io.FastBufferedInputStream
import org.eclipse.jetty.server.{Handler, Server}
+import org.json4s.jackson.JsonMethods._
import org.apache.spark.{Logging, SparkContext, SparkEnv}
+import org.apache.spark.scheduler._
import org.apache.spark.ui.JettyUtils._
import org.apache.spark.ui.env.EnvironmentUI
import org.apache.spark.ui.exec.ExecutorsUI
import org.apache.spark.ui.jobs.JobProgressUI
import org.apache.spark.ui.storage.BlockManagerUI
import org.apache.spark.util.Utils
+import org.apache.spark.util.JsonProtocol
-/** Top level user interface for Spark */
-private[spark] class SparkUI(sc: SparkContext) extends Logging {
+/** Top level user interface for Spark. */
+private[spark] class SparkUI(val sc: SparkContext) extends Logging {
--- End diff --
It might make more sense for this to be an `Option[SparkContext]` rather
than potentially null
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