HeartSaVioR commented on a change in pull request #33081:
URL: https://github.com/apache/spark/pull/33081#discussion_r670894600
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala
##########
@@ -511,6 +513,298 @@ case class StateStoreSaveExec(
copy(child = newChild)
}
+/**
+ * This class sorts input rows and existing sessions in state and provides
output rows as
+ * sorted by "group keys + start time of session window".
+ *
+ * Refer [[MergingSortWithSessionWindowStateIterator]] for more details.
+ */
+case class SessionWindowStateStoreRestoreExec(
+ keyWithoutSessionExpressions: Seq[Attribute],
+ sessionExpression: Attribute,
+ stateInfo: Option[StatefulOperatorStateInfo],
+ eventTimeWatermark: Option[Long],
+ stateFormatVersion: Int,
+ child: SparkPlan)
+ extends UnaryExecNode with StateStoreReader with WatermarkSupport {
+
+ override def keyExpressions: Seq[Attribute] = keyWithoutSessionExpressions
+
+ private val stateManager =
StreamingSessionWindowStateManager.createStateManager(
+ keyWithoutSessionExpressions, sessionExpression, child.output,
stateFormatVersion)
+
+ override protected def doExecute(): RDD[InternalRow] = {
+ val numOutputRows = longMetric("numOutputRows")
+ assert(keyExpressions.nonEmpty, "Grouping key must be specified when using
sessionWindow")
+
+ child.execute().mapPartitionsWithReadStateStore(
+ getStateInfo,
+ stateManager.getStateKeySchema,
+ stateManager.getStateValueSchema,
+ numColsPrefixKey = stateManager.getNumColsForPrefixKey,
+ session.sessionState,
+ Some(session.streams.stateStoreCoordinator)) { case (store, iter) =>
+
+ // We need to filter out outdated inputs
+ val filteredIterator = watermarkPredicateForData match {
+ case Some(predicate) => iter.filter((row: InternalRow) =>
!predicate.eval(row))
+ case None => iter
+ }
+
+ new MergingSortWithSessionWindowStateIterator(
+ filteredIterator,
+ stateManager,
+ store,
+ keyWithoutSessionExpressions,
+ sessionExpression,
+ child.output).map { row =>
+ numOutputRows += 1
+ row
+ }
+ }
+ }
+
+ override def output: Seq[Attribute] = child.output
+
+ override def outputPartitioning: Partitioning = child.outputPartitioning
+
+ override def outputOrdering: Seq[SortOrder] = {
+ (keyWithoutSessionExpressions ++ Seq(sessionExpression)).map(SortOrder(_,
Ascending))
+ }
+
+ override def requiredChildDistribution: Seq[Distribution] = {
+ if (keyWithoutSessionExpressions.isEmpty) {
+ AllTuples :: Nil
+ } else {
+ ClusteredDistribution(keyWithoutSessionExpressions,
stateInfo.map(_.numPartitions)) :: Nil
+ }
+ }
+
+ override def requiredChildOrdering: Seq[Seq[SortOrder]] = {
+ Seq((keyWithoutSessionExpressions ++
Seq(sessionExpression)).map(SortOrder(_, Ascending)))
+ }
+
+ override protected def withNewChildInternal(newChild: SparkPlan): SparkPlan =
+ copy(child = newChild)
+}
+
+/**
+ * For each input tuple, the key is calculated and the tuple is `put` into the
[[StateStore]].
+ */
+case class SessionWindowStateStoreSaveExec(
+ keyExpressions: Seq[Attribute],
+ sessionExpression: Attribute,
+ stateInfo: Option[StatefulOperatorStateInfo] = None,
+ outputMode: Option[OutputMode] = None,
+ eventTimeWatermark: Option[Long] = None,
+ stateFormatVersion: Int,
+ child: SparkPlan)
+ extends UnaryExecNode with StateStoreWriter with WatermarkSupport {
+
+ private val keyWithoutSessionExpressions = keyExpressions.filterNot { p =>
+ p.semanticEquals(sessionExpression)
+ }
+
+ private val stateManager =
StreamingSessionWindowStateManager.createStateManager(
+ keyWithoutSessionExpressions, sessionExpression, child.output,
stateFormatVersion)
+
+ override protected def doExecute(): RDD[InternalRow] = {
+ metrics // force lazy init at driver
+ assert(outputMode.nonEmpty,
+ "Incorrect planning in IncrementalExecution, outputMode has not been
set")
+ assert(keyExpressions.nonEmpty,
+ "Grouping key must be specified when using sessionWindow")
+
+ child.execute().mapPartitionsWithStateStore(
+ getStateInfo,
+ stateManager.getStateKeySchema,
+ stateManager.getStateValueSchema,
+ numColsPrefixKey = stateManager.getNumColsForPrefixKey,
+ session.sessionState,
+ Some(session.streams.stateStoreCoordinator)) { case (store, iter) =>
+
+ val numOutputRows = longMetric("numOutputRows")
+ val allUpdatesTimeMs = longMetric("allUpdatesTimeMs")
+ val allRemovalsTimeMs = longMetric("allRemovalsTimeMs")
+ val commitTimeMs = longMetric("commitTimeMs")
+
+ outputMode match {
+ // Update and output all rows in the StateStore.
+ case Some(Complete) =>
+ allUpdatesTimeMs += timeTakenMs {
+ putToStore(iter, store, false)
+ }
+ allRemovalsTimeMs += 0
+ commitTimeMs += timeTakenMs {
+ stateManager.commit(store)
+ }
+ setStoreMetrics(store)
+ stateManager.iterator(store).map { row =>
+ numOutputRows += 1
+ row
+ }
+
+ // Update and output only rows being evicted from the StateStore
+ // Assumption: watermark predicates must be non-empty if append mode
is allowed
+ case Some(Append) =>
+ allUpdatesTimeMs += timeTakenMs {
+ putToStore(iter, store, true)
+ }
+
+ val removalStartTimeNs = System.nanoTime
+ new NextIterator[InternalRow] {
+ private val removedIter = stateManager.removeByValueCondition(
+ store, watermarkPredicateForData.get.eval)
Review comment:
removeByValueCondition returns "iterator" which is evaluated "lazily".
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