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/*
* 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.rdd.RDD
import org.apache.spark.storage.{BlockId, StorageLevel}
import org.apache.spark.streaming.dstream.ReceiverInputDStream
import org.apache.spark.streaming.receiver.Receiver
import org.apache.spark.streaming.scheduler.ReceivedBlockInfo
import org.apache.spark.streaming.{Duration, StreamingContext, Time}
private[kinesis] class KinesisInputDStream[T: ClassTag](
@transient _ssc: StreamingContext,
streamName: String,
endpointUrl: String,
regionName: String,
initialPositionInStream: InitialPositionInStream,
checkpointAppName: String,
checkpointInterval: Duration,
storageLevel: StorageLevel,
messageHandler: Record => T,
awsCredentialsOption: Option[SerializableAWSCredentials]
) extends ReceiverInputDStream[T](_ssc) {
private[streaming]
override def createBlockRDD(time: Time, blockInfos: Seq[ReceivedBlockInfo]): RDD[T] = {
// This returns true even for when blockInfos is empty
val allBlocksHaveRanges = blockInfos.map { _.metadataOption }.forall(_.nonEmpty)
if (allBlocksHaveRanges) {
// Create a KinesisBackedBlockRDD, even when there are no blocks
val blockIds = blockInfos.map { _.blockId.asInstanceOf[BlockId] }.toArray
val seqNumRanges = blockInfos.map {
_.metadataOption.get.asInstanceOf[SequenceNumberRanges] }.toArray
val isBlockIdValid = blockInfos.map { _.isBlockIdValid() }.toArray
logDebug(s"Creating KinesisBackedBlockRDD for $time with ${seqNumRanges.length} " +
s"seq number ranges: ${seqNumRanges.mkString(", ")} ")
new KinesisBackedBlockRDD(
context.sc, regionName, endpointUrl, blockIds, seqNumRanges,
isBlockIdValid = isBlockIdValid,
retryTimeoutMs = ssc.graph.batchDuration.milliseconds.toInt,
messageHandler = messageHandler,
awsCredentialsOption = awsCredentialsOption)
} else {
logWarning("Kinesis sequence number information was not present with some block metadata," +
" it may not be possible to recover from failures")
super.createBlockRDD(time, blockInfos)
}
}
override def getReceiver(): Receiver[T] = {
new KinesisReceiver(streamName, endpointUrl, regionName, initialPositionInStream,
checkpointAppName, checkpointInterval, storageLevel, messageHandler, awsCredentialsOption)
}
}
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