Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/11645#discussion_r56919238
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStoreRDD.scala
---
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.streaming.state
+
+import scala.reflect.ClassTag
+
+import org.apache.spark.{Partition, TaskContext}
+import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.types.StructType
+import org.apache.spark.util.{SerializableConfiguration, Utils}
+
+/**
+ * An RDD that allows computations to be executed against [[StateStore]]s.
It
+ * uses the [[StateStoreCoordinator]] to use the locations of loaded state
stores as
+ * preferred locations.
+ */
+class StateStoreRDD[T: ClassTag, U: ClassTag](
+ dataRDD: RDD[T],
+ storeUpdateFunction: (StateStore, Iterator[T]) => Iterator[U],
+ checkpointLocation: String,
+ operatorId: Long,
+ storeVersion: Long,
+ keySchema: StructType,
+ valueSchema: StructType,
+ @transient private val storeCoordinator:
Option[StateStoreCoordinatorRef])
+ extends RDD[U](dataRDD) {
+
+ // A Hadoop Configuration can be about 10 KB, which is pretty big, so
broadcast it
+ private val confBroadcast = dataRDD.context.broadcast(
--- End diff --
Would it be okay if I do this optimization in a future PR?
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