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package spark.scheduler
import spark.scheduler.cluster.TaskInfo
import spark.util.Distribution
import spark.{Utils, Logging}
import spark.executor.TaskMetrics
trait SparkListener {
/**
* called when a stage is completed, with information on the completed stage
*/
def onStageCompleted(stageCompleted: StageCompleted)
}
sealed trait SparkListenerEvents
case class StageCompleted(val stageInfo: StageInfo) extends SparkListenerEvents
/**
* Simple SparkListener that logs a few summary statistics when each stage completes
*/
class StatsReportListener extends SparkListener with Logging {
def onStageCompleted(stageCompleted: StageCompleted) {
import spark.scheduler.StatsReportListener._
implicit val sc = stageCompleted
this.logInfo("Finished stage: " + stageCompleted.stageInfo)
showMillisDistribution("task runtime:", (info, _) => Some(info.duration))
//shuffle write
showBytesDistribution("shuffle bytes written:",(_,metric) => metric.shuffleWriteMetrics.map{_.shuffleBytesWritten})
//fetch & io
showMillisDistribution("fetch wait time:",(_, metric) => metric.shuffleReadMetrics.map{_.fetchWaitTime})
showBytesDistribution("remote bytes read:", (_, metric) => metric.shuffleReadMetrics.map{_.remoteBytesRead})
showBytesDistribution("task result size:", (_, metric) => Some(metric.resultSize))
//runtime breakdown
val runtimePcts = stageCompleted.stageInfo.taskInfos.map{
case (info, metrics) => RuntimePercentage(info.duration, metrics)
}
showDistribution("executor (non-fetch) time pct: ", Distribution(runtimePcts.map{_.executorPct * 100}), "%2.0f %%")
showDistribution("fetch wait time pct: ", Distribution(runtimePcts.flatMap{_.fetchPct.map{_ * 100}}), "%2.0f %%")
showDistribution("other time pct: ", Distribution(runtimePcts.map{_.other * 100}), "%2.0f %%")
}
}
object StatsReportListener extends Logging {
//for profiling, the extremes are more interesting
val percentiles = Array[Int](0,5,10,25,50,75,90,95,100)
val probabilities = percentiles.map{_ / 100.0}
val percentilesHeader = "\t" + percentiles.mkString("%\t") + "%"
def extractDoubleDistribution(stage:StageCompleted, getMetric: (TaskInfo,TaskMetrics) => Option[Double]): Option[Distribution] = {
Distribution(stage.stageInfo.taskInfos.flatMap{
case ((info,metric)) => getMetric(info, metric)})
}
//is there some way to setup the types that I can get rid of this completely?
def extractLongDistribution(stage:StageCompleted, getMetric: (TaskInfo,TaskMetrics) => Option[Long]): Option[Distribution] = {
extractDoubleDistribution(stage, (info, metric) => getMetric(info,metric).map{_.toDouble})
}
def showDistribution(heading: String, d: Distribution, formatNumber: Double => String) {
val stats = d.statCounter
logInfo(heading + stats)
val quantiles = d.getQuantiles(probabilities).map{formatNumber}
logInfo(percentilesHeader)
logInfo("\t" + quantiles.mkString("\t"))
}
def showDistribution(heading: String, dOpt: Option[Distribution], formatNumber: Double => String) {
dOpt.foreach { d => showDistribution(heading, d, formatNumber)}
}
def showDistribution(heading: String, dOpt: Option[Distribution], format:String) {
def f(d:Double) = format.format(d)
showDistribution(heading, dOpt, f _)
}
def showDistribution(heading:String, format: String, getMetric: (TaskInfo,TaskMetrics) => Option[Double])
(implicit stage: StageCompleted) {
showDistribution(heading, extractDoubleDistribution(stage, getMetric), format)
}
def showBytesDistribution(heading:String, getMetric: (TaskInfo,TaskMetrics) => Option[Long])
(implicit stage: StageCompleted) {
showBytesDistribution(heading, extractLongDistribution(stage, getMetric))
}
def showBytesDistribution(heading: String, dOpt: Option[Distribution]) {
dOpt.foreach{dist => showBytesDistribution(heading, dist)}
}
def showBytesDistribution(heading: String, dist: Distribution) {
showDistribution(heading, dist, (d => Utils.memoryBytesToString(d.toLong)): Double => String)
}
def showMillisDistribution(heading: String, dOpt: Option[Distribution]) {
showDistribution(heading, dOpt, (d => StatsReportListener.millisToString(d.toLong)): Double => String)
}
def showMillisDistribution(heading: String, getMetric: (TaskInfo, TaskMetrics) => Option[Long])
(implicit stage: StageCompleted) {
showMillisDistribution(heading, extractLongDistribution(stage, getMetric))
}
val seconds = 1000L
val minutes = seconds * 60
val hours = minutes * 60
/**
* reformat a time interval in milliseconds to a prettier format for output
*/
def millisToString(ms: Long) = {
val (size, units) =
if (ms > hours) {
(ms.toDouble / hours, "hours")
} else if (ms > minutes) {
(ms.toDouble / minutes, "min")
} else if (ms > seconds) {
(ms.toDouble / seconds, "s")
} else {
(ms.toDouble, "ms")
}
"%.1f %s".format(size, units)
}
}
case class RuntimePercentage(executorPct: Double, fetchPct: Option[Double], other: Double)
object RuntimePercentage {
def apply(totalTime: Long, metrics: TaskMetrics): RuntimePercentage = {
val denom = totalTime.toDouble
val fetchTime = metrics.shuffleReadMetrics.map{_.fetchWaitTime}
val fetch = fetchTime.map{_ / denom}
val exec = (metrics.executorRunTime - fetchTime.getOrElse(0l)) / denom
val other = 1.0 - (exec + fetch.getOrElse(0d))
RuntimePercentage(exec, fetch, other)
}
}
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