Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/15702#discussion_r86200392
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StatefulAggregate.scala
---
@@ -104,85 +110,105 @@ case class StateStoreSaveExec(
override protected def doExecute(): RDD[InternalRow] = {
metrics // force lazy init at driver
- assert(returnAllStates.nonEmpty,
- "Incorrect planning in IncrementalExecution, returnAllStates have
not been set")
- val saveAndReturnFunc = if (returnAllStates.get) saveAndReturnAll _
else saveAndReturnUpdated _
+ assert(outputMode.nonEmpty,
+ "Incorrect planning in IncrementalExecution, outputMode has not been
set")
+
child.execute().mapPartitionsWithStateStore(
getStateId.checkpointLocation,
operatorId = getStateId.operatorId,
storeVersion = getStateId.batchId,
keyExpressions.toStructType,
child.output.toStructType,
sqlContext.sessionState,
- Some(sqlContext.streams.stateStoreCoordinator)
- )(saveAndReturnFunc)
+ Some(sqlContext.streams.stateStoreCoordinator)) { (store, iter) =>
+ val getKey = GenerateUnsafeProjection.generate(keyExpressions,
child.output)
+ val numOutputRows = longMetric("numOutputRows")
+ val numTotalStateRows = longMetric("numTotalStateRows")
+ val numUpdatedStateRows = longMetric("numUpdatedStateRows")
+
+ outputMode match {
+ // Update and output all rows in the StateStore.
+ case Some(Complete) =>
+ while (iter.hasNext) {
+ val row = iter.next().asInstanceOf[UnsafeRow]
+ val key = getKey(row)
+ store.put(key.copy(), row.copy())
+ numUpdatedStateRows += 1
+ }
+ store.commit()
+ numTotalStateRows += store.numKeys()
+ store.iterator().map { case (k, v) =>
+ numOutputRows += 1
+ v.asInstanceOf[InternalRow]
+ }
+
+ // Update and output only rows being evicted from the StateStore
+ case Some(Append) =>
+ while (iter.hasNext) {
+ val row = iter.next().asInstanceOf[UnsafeRow]
+ val key = getKey(row)
+ store.put(key.copy(), row.copy())
+ numUpdatedStateRows += 1
+ }
+
+ val watermarkAttribute =
+
keyExpressions.find(_.metadata.contains(EventTimeWatermark.delayKey)).get
+ // If we are evicting based on a window, use the end of the
window. Otherwise just
+ // use the attribute itself.
+ val evictionExpression =
+ if (watermarkAttribute.dataType.isInstanceOf[StructType]) {
+ LessThanOrEqual(
+ GetStructField(watermarkAttribute, 1),
+ Literal(eventTimeWatermark.get * 1000))
+ } else {
+ LessThanOrEqual(
+ watermarkAttribute,
+ Literal(eventTimeWatermark.get * 1000))
+ }
+
+ logInfo(s"Filtering state store on: $evictionExpression")
+ val predicate = newPredicate(evictionExpression,
keyExpressions)
+ store.remove(predicate)
+
+ store.commit()
+
+ numTotalStateRows += store.numKeys()
+ store.updates().filter(_.isInstanceOf[ValueRemoved]).map {
removed =>
+ numOutputRows += 1
+ removed.value.asInstanceOf[InternalRow]
+ }
+
+ // Update and output modified rows from the StateStore.
+ case Some(Update) =>
--- End diff --
The only output modes that are supported publicly are `Complete` and
`Append` (update is only available internally for tests). When we add support
for `Update` (I'd like to do this soon), it should also evict tuples which can
no longer be updated due to their group falling beneath the watermark. I
thought that it was fairly clear that `Complete` would need to retain the
complete set of aggregate state, but I'm happy to make this more explicit if
others are confused by this.
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