viirya commented on a change in pull request #26935:
URL: https://github.com/apache/spark/pull/26935#discussion_r498629306
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStoreRDD.scala
##########
@@ -29,6 +29,57 @@ import org.apache.spark.sql.internal.SessionState
import org.apache.spark.sql.types.StructType
import org.apache.spark.util.SerializableConfiguration
+/**
+ * An RDD that allows computations to be executed against
[[ReadOnlyStateStore]]s. It
+ * uses the [[StateStoreCoordinator]] to get the locations of loaded state
stores
+ * and use that as the preferred locations.
+ */
+class ReadOnlyStateStoreRDD[T: ClassTag, U: ClassTag](
+ dataRDD: RDD[T],
+ storeReadFunction: (ReadOnlyStateStore, Iterator[T]) => Iterator[U],
+ checkpointLocation: String,
+ queryRunId: UUID,
+ operatorId: Long,
+ storeVersion: Long,
+ keySchema: StructType,
+ valueSchema: StructType,
+ indexOrdinal: Option[Int],
+ sessionState: SessionState,
+ @transient private val storeCoordinator: Option[StateStoreCoordinatorRef],
+ extraOptions: Map[String, String] = Map.empty) extends RDD[U](dataRDD) {
+
+ private val storeConf = new StateStoreConf(sessionState.conf, extraOptions)
+
+ // A Hadoop Configuration can be about 10 KB, which is pretty big, so
broadcast it
+ private val hadoopConfBroadcast = dataRDD.context.broadcast(
+ new SerializableConfiguration(sessionState.newHadoopConf()))
+
+ override protected def getPartitions: Array[Partition] = dataRDD.partitions
+
+ /**
+ * Set the preferred location of each partition using the executor that has
the related
+ * [[StateStoreProvider]] already loaded.
+ */
+ override def getPreferredLocations(partition: Partition): Seq[String] = {
+ val stateStoreProviderId = StateStoreProviderId(
+ StateStoreId(checkpointLocation, operatorId, partition.index),
+ queryRunId)
+ storeCoordinator.flatMap(_.getLocation(stateStoreProviderId)).toSeq
+ }
+
+ override def compute(partition: Partition, ctxt: TaskContext): Iterator[U] =
{
+ val storeProviderId = StateStoreProviderId(
+ StateStoreId(checkpointLocation, operatorId, partition.index),
+ queryRunId)
+
+ val store = StateStore.getReadOnly(
+ storeProviderId, keySchema, valueSchema, indexOrdinal, storeVersion,
Review comment:
Sounds too complicated, and it's also a bit weird and read-only store
calls both abort and close. Let's keep with original abort and commit for now.
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