Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/17250#discussion_r105792656
--- Diff:
external/kinesis-asl/src/main/scala/org/apache/spark/streaming/kinesis/KinesisDStream.scala
---
@@ -0,0 +1,559 @@
+/*
+ * 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 scala.reflect.ClassTag
+
+import
com.amazonaws.services.kinesis.clientlibrary.lib.worker.InitialPositionInStream
+import com.amazonaws.services.kinesis.model.Record
+
+import org.apache.spark.annotation.InterfaceStability
+import org.apache.spark.storage.StorageLevel
+import org.apache.spark.streaming.{Duration, StreamingContext}
+import org.apache.spark.streaming.api.java.JavaStreamingContext
+
+@InterfaceStability.Stable
+object KinesisDStream {
+ /**
+ * Builder for [[KinesisInputDStream]] instances.
+ *
+ * @param ssc StreamingContext to be used for creating DStreams
+ * @param streamName Name of Kinesis stream
+ * @param messageHandler Function for extracting DStream data type from
KCL Record
+ *
+ * @since 2.2.0
+ */
+ @InterfaceStability.Stable
+ class Builder[T: ClassTag](
+ ssc: StreamingContext,
+ streamName: String,
+ messageHandler: Record => T) {
+ private var endpointUrl = DEFAULT_KINESIS_ENDPOINT_URL
+ private var regionName = DEFAULT_KINESIS_REGION_NAME
+ private var initialPositionInStream =
DEFAULT_INITIAL_POSITION_IN_STREAM
+ private var checkpointAppName = ssc.sparkContext.appName
+ private var checkpointInterval = ssc.graph.batchDuration
+ private var storageLevel = DEFAULT_STORAGE_LEVEL
+ private var kinesisCredsProvider: SerializableCredentialsProvider =
DefaultCredentialsProvider
+ private var dynamoDBCredsProvider:
Option[SerializableCredentialsProvider] = None
+ private var cloudWatchCredsProvider:
Option[SerializableCredentialsProvider] = None
+
+ /**
+ * Sets the AWS Kinesis endpoint URL. Defaults to
"https://kinesis.us-east-1.amazonaws.com"; if
+ * no custom value is specified
+ *
+ * @param url Kinesis endpoint URL to use
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def endpointUrl(url: String): Builder[T] = {
+ endpointUrl = url
+ this
+ }
+
+ /**
+ * Sets the AWS region to construct clients for. Defaults to
"us-east-1" if no custom value
+ * is specified.
+ *
+ * @param regionName Name of AWS region to use (e.g. "us-west-2")
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def regionName(regionName: String): Builder[T] = {
+ this.regionName = regionName
+ this
+ }
+
+ /**
+ * Sets the initial position data is read from in the Kinesis stream.
Defaults to
+ * InitialPositionInStream.LATEST if no custom value is specified.
+ *
+ * @param initialPosition InitialPositionInStream value specifying
where Spark Streaming
+ * will start reading records in the Kinesis
stream from
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def initialPositionInStream(initialPosition: InitialPositionInStream):
Builder[T] = {
+ initialPositionInStream = initialPosition
+ this
+ }
+
+ /**
+ * Sets the KCL application name to use when checkpointing state to
DynamoDB. Defaults to the
+ * Spark app name if no custom value is specified.
+ *
+ * @param appName Value to use for the KCL app name (used when
creating the DynamoDB checkpoint
+ * table and when writing metrics to CloudWatch)
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def checkpointAppName(appName: String): Builder[T] = {
+ checkpointAppName = appName
+ this
+ }
+
+ /**
+ * Sets how often the KCL application state is checkpointed to
DynamoDB. Defaults to the Spark
+ * Streaming batch interval if no custom value is specified.
+ *
+ * @param interval [[Duration]] specifying how often the KCL state
should be checkpointed to
+ * DynamoDB.
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def checkpointInterval(interval: Duration): Builder[T] = {
+ checkpointInterval = interval
+ this
+ }
+
+ /**
+ * Sets the storage level of the blocks for the DStream created.
Defaults to
+ * [[StorageLevel.MEMORY_AND_DISK_2]] if no custom value is specified.
+ *
+ * @param storageLevel [[StorageLevel]] to use for the DStream data
blocks
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def storageLevel(storageLevel: StorageLevel): Builder[T] = {
+ this.storageLevel = storageLevel
+ this
+ }
+
+ /**
+ * Use the default AWS credentials provider chain to authenticate to
the Kinesis service. This
+ * is also the default credentials provider used if no custom value is
specified.
+ *
+ * @return Reference to this [[KinesisDStream.Builder]]
+ */
+ def kinesisDefaultCredentials(): Builder[T] = {
--- End diff --
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