HeartSaVioR commented on code in PR #44884:
URL: https://github.com/apache/spark/pull/44884#discussion_r1480841542
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/TransformWithStateExec.scala:
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@@ -155,23 +161,112 @@ case class TransformWithStateExec(
override protected def doExecute(): RDD[InternalRow] = {
metrics // force lazy init at driver
- child.execute().mapPartitionsWithStateStore[InternalRow](
- getStateInfo,
- schemaForKeyRow,
- schemaForValueRow,
- numColsPrefixKey = 0,
- session.sqlContext.sessionState,
- Some(session.sqlContext.streams.stateStoreCoordinator),
- useColumnFamilies = true
- ) {
- case (store: StateStore, singleIterator: Iterator[InternalRow]) =>
- val processorHandle = new StatefulProcessorHandleImpl(store,
getStateInfo.queryRunId,
- keyEncoder)
- assert(processorHandle.getHandleState ==
StatefulProcessorHandleState.CREATED)
- statefulProcessor.init(processorHandle, outputMode)
-
processorHandle.setHandleState(StatefulProcessorHandleState.INITIALIZED)
- val result = processDataWithPartition(singleIterator, store,
processorHandle)
- result
+ if (isStreaming) {
+ child.execute().mapPartitionsWithStateStore[InternalRow](
+ getStateInfo,
+ schemaForKeyRow,
+ schemaForValueRow,
+ numColsPrefixKey = 0,
+ session.sqlContext.sessionState,
+ Some(session.sqlContext.streams.stateStoreCoordinator),
+ useColumnFamilies = true
+ ) {
+ case (store: StateStore, singleIterator: Iterator[InternalRow]) =>
+ processData(store, singleIterator)
+ }
+ } else {
+ // If the query is running in batch mode, we need to create a new
StateStore and instantiate
+ // a temp directory on the executors in mapPartitionsWithIndex.
+ child.execute().mapPartitionsWithIndex[InternalRow](
+ (i, iter) => {
+ val providerId = {
+ // lazy creation to initialize tempDirPath once
+ lazy val tempDirPath = Utils.createTempDir().getAbsolutePath
Review Comment:
Please see the question again - my question was "will this be evaluate once
per executor?". If then this is a good optimization, otherwise lazy val does
nothing and it just confuses people.
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