Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9256#discussion_r44205241
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/dstream/EmittedRecordsDStream.scala
---
@@ -0,0 +1,114 @@
+/*
+ * 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.streaming.dstream
+
+import scala.reflect.ClassTag
+
+import org.apache.spark._
+import org.apache.spark.annotation.Experimental
+import org.apache.spark.rdd.{EmptyRDD, RDD}
+import org.apache.spark.storage.StorageLevel
+import org.apache.spark.streaming._
+import org.apache.spark.streaming.rdd.{TrackStateRDD, TrackStateRDDRecord}
+
+/**
+ * :: Experimental ::
+ * DStream representing the stream of records emitted after the
`trackStateByKey` operation
+ * on a [[org.apache.spark.streaming.dstream.PairDStreamFunctions pair
DStream]] in Scala.
+ * Additionally, it also gives access to the stream of state snapshots,
that is, the state data of
+ * all keys after a batch has updated them.
+ *
+ * @tparam K Class of the state key
+ * @tparam S Class of the state data
+ * @tparam T Class of the emitted records
+ */
+@Experimental
+sealed abstract class EmittedRecordsDStream[K, S, T: ClassTag](
--- End diff --
@rxin @pwendell Is `EmittedRecordsDStream` is good or should we change
this? Things that have been suggested.
1. EmittedDStream - Pro: shorter, no ref to "record". Con: Emitted what?
states?
2. StateDStream - Logic: DStream generated by `trackStateByKey`. Pro:
shorter. Con: sounds like a stream of states (similar to updateStateByKey), but
that this is not.
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