Github user budde commented on a diff in the pull request:
https://github.com/apache/spark/pull/18029#discussion_r134068101
--- Diff:
external/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/InitialPosition.scala
---
@@ -0,0 +1,107 @@
+/*
+ * 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.kinesis
+
+import java.util.Date
+
+import
com.amazonaws.services.kinesis.clientlibrary.lib.worker.InitialPositionInStream
+
+/**
+ * Trait for Kinesis's InitialPositionInStream.
+ * This will be overridden by more specific types.
+ */
+sealed trait InitialPosition {
+ var initialPositionInStream: InitialPositionInStream
+}
+
+/**
+ * Case object for Kinesis's InitialPositionInStream.LATEST.
+ */
+case object Latest extends InitialPosition {
+ def instance: InitialPosition = this
+ override var initialPositionInStream: InitialPositionInStream
+ = InitialPositionInStream.LATEST
+}
+
+/**
+ * Case object for Kinesis's InitialPositionInStream.TRIM_HORIZON.
+ */
+case object TrimHorizon extends InitialPosition {
+ def instance: InitialPosition = this
+ override var initialPositionInStream: InitialPositionInStream
+ = InitialPositionInStream.TRIM_HORIZON
+}
+
+/**
+ * Case object for Kinesis's InitialPositionInStream.AT_TIMESTAMP.
+ */
+case class AtTimestamp(timestamp: Date) extends InitialPosition {
+ def instance: InitialPosition = this
+ override var initialPositionInStream: InitialPositionInStream
+ = InitialPositionInStream.AT_TIMESTAMP
+}
+
+/**
+ * Companion object for InitialPosition that returns
+ * appropriate version of InitialPositionInStream.
+ */
+object InitialPosition {
+
+ /**
+ * Returns instance of Latest with InitialPositionInStream.LATEST.
+ * @return [[Latest]]
+ */
+ def latest() : InitialPosition = {
+ Latest
+ }
+
+ /**
+ * Returns instance of Latest with InitialPositionInStream.TRIM_HORIZON.
+ * @return [[TrimHorizon]]
+ */
+ def trimHorizon() : InitialPosition = {
+ TrimHorizon
+ }
+
+ /**
+ * Returns instance of AtTimestamp with
InitialPositionInStream.AT_TIMESTAMP.
+ * @return [[AtTimestamp]]
+ */
+ def atTimestamp(timestamp: Date) : InitialPosition = {
+ AtTimestamp(timestamp)
+ }
+
+ /**
+ * Returns instance of [[InitialPosition]] based on the passed
[[InitialPositionInStream]].
+ * @return [[InitialPosition]]
+ */
+ def kinesisInitialPositionInStream(
--- End diff --
Ok, I see that it is being used to maintain the original APIs present in
```KinesisUtils```. However, we should be deprecating ```KinesisUtils``` at
some (undetermined?) point. Would be good to remove this method at that time as
well.
I'd suggest adding a comment to the docs for this method indicating it
exists to maintain compatibility with the original ```KinesisUtils``` API.
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