Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/3009#discussion_r20673960 --- Diff: core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala --- @@ -144,11 +146,30 @@ class JobProgressListener(conf: SparkConf) extends SparkListener with Logging { } override def onJobStart(jobStart: SparkListenerJobStart) = synchronized { - val jobGroup = Option(jobStart.properties).map(_.getProperty(SparkContext.SPARK_JOB_GROUP_ID)) + val jobGroup = for ( + props <- Option(jobStart.properties); + group <- Option(props.getProperty(SparkContext.SPARK_JOB_GROUP_ID)) + ) yield group val jobData: JobUIData = - new JobUIData(jobStart.jobId, jobStart.stageIds, jobGroup, JobExecutionStatus.RUNNING) + new JobUIData(jobStart.jobId, Some(System.currentTimeMillis), None, jobStart.stageIds, + jobGroup, JobExecutionStatus.RUNNING) + // Compute (a potential underestimate of) the number of tasks that will be run by this job: --- End diff -- How's this for an explanation? ``` // Compute (a potential underestimate of) the number of tasks that will be run by this job. // This may be an underestimate because the job start event references all of the result // stages's transitive stage dependencies, but some of these stages might be skipped if their // output is available from earlier runs. ```
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