HeartSaVioR commented on a change in pull request #23576: [SPARK-26655] [SS]
Support multiple aggregates in append mode
URL: https://github.com/apache/spark/pull/23576#discussion_r249322190
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/WatermarkTracker.scala
##########
@@ -80,34 +80,84 @@ case object MaxWatermark extends MultipleWatermarkPolicy {
/** Tracks the watermark value of a streaming query based on a given `policy`
*/
case class WatermarkTracker(policy: MultipleWatermarkPolicy) extends Logging {
private val operatorToWatermarkMap = mutable.HashMap[Int, Long]()
+ private val statefulOperatorToWatermark = mutable.HashMap[Long, Long]()
+ private val statefulOperatorToEventTimeMap = mutable.HashMap[Long,
mutable.HashMap[Int, Long]]()
+
private var globalWatermarkMs: Long = 0
+ private def updateWaterMarkMap(eventTimeExecs: Seq[EventTimeWatermarkExec],
+ map: mutable.HashMap[Int, Long]): Unit = {
+ eventTimeExecs.zipWithIndex.foreach {
+ case (e, index) if e.eventTimeStats.value.count > 0 =>
+ logDebug(s"Observed event time stats $index:
${e.eventTimeStats.value}")
+ val newWatermarkMs = e.eventTimeStats.value.max - e.delayMs
+ val prevWatermarkMs = map.get(index)
+ if (prevWatermarkMs.isEmpty || newWatermarkMs > prevWatermarkMs.get) {
+ map.put(index, newWatermarkMs)
+ }
+
+ // Populate 0 if we haven't seen any data yet for this watermark node.
+ case (_, index) =>
+ if (!map.isDefinedAt(index)) {
+ map.put(index, 0)
+ }
+ }
+ }
+
def setWatermark(newWatermarkMs: Long): Unit = synchronized {
globalWatermarkMs = newWatermarkMs
}
+ def setOperatorWatermarks(operatorWatermarks: Map[Long, Long]): Unit =
synchronized {
+ statefulOperatorToWatermark ++= operatorWatermarks
+ }
+
def updateWatermark(executedPlan: SparkPlan): Unit = synchronized {
val watermarkOperators = executedPlan.collect {
case e: EventTimeWatermarkExec => e
}
if (watermarkOperators.isEmpty) return
- watermarkOperators.zipWithIndex.foreach {
- case (e, index) if e.eventTimeStats.value.count > 0 =>
- logDebug(s"Observed event time stats $index:
${e.eventTimeStats.value}")
- val newWatermarkMs = e.eventTimeStats.value.max - e.delayMs
- val prevWatermarkMs = operatorToWatermarkMap.get(index)
- if (prevWatermarkMs.isEmpty || newWatermarkMs > prevWatermarkMs.get) {
- operatorToWatermarkMap.put(index, newWatermarkMs)
- }
+ updateWaterMarkMap(watermarkOperators, operatorToWatermarkMap)
- // Populate 0 if we haven't seen any data yet for this watermark node.
- case (_, index) =>
- if (!operatorToWatermarkMap.isDefinedAt(index)) {
- operatorToWatermarkMap.put(index, 0)
- }
+ // compute the per stateful operator watermark
+ val statefulOperators = executedPlan.collect {
+ case s: StatefulOperator => s
}
+ statefulOperators.foreach(statefulOperator => {
+ // find the first event time child node(s)
+ val eventTimeExecs = statefulOperator match {
+ case op: UnaryExecNode =>
+ op.collectFirst {
+ case e: EventTimeWatermarkExec => e
+ }.map(Seq(_)).getOrElse(Seq())
+ case op: BinaryExecNode =>
+ val left = op.left.collectFirst {
+ case e: EventTimeWatermarkExec => e
+ }.map(Seq(_)).getOrElse(Seq())
+ val right = op.right.collectFirst {
+ case e: EventTimeWatermarkExec => e
+ }.map(Seq(_)).getOrElse(Seq())
+ left ++ right
+ }
+
+ // compute watermark for the stateful operator node
+ statefulOperator.stateInfo.foreach(state => {
+ if (eventTimeExecs.nonEmpty) {
+ updateWaterMarkMap(eventTimeExecs,
+ statefulOperatorToEventTimeMap.getOrElseUpdate(state.operatorId,
+ new mutable.HashMap[Int, Long]()))
+ val newWatermarkMs =
statefulOperatorToEventTimeMap(state.operatorId).values.toSeq.min
Review comment:
We may want to apply watermark policy also here, like
`policy.chooseGlobalWatermark(statefulOperatorToEventTimeMap(state.operatorId).values.toSeq)`
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