Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/223#discussion_r10961654
--- Diff:
external/AmazonKinesis/src/main/scala/org/apache/spark/streaming/kinesis/KinesisInputDStream.scala
---
@@ -0,0 +1,164 @@
+/*
+ * 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 org.apache.spark.streaming.StreamingContext
+import scala.reflect.ClassTag
+import org.apache.spark.storage.StorageLevel
+import org.apache.spark.streaming.dstream.NetworkReceiver
+import com.amazonaws.auth.AWSCredentialsProvider
+import java.util.UUID
+import com.amazonaws.auth.InstanceProfileCredentialsProvider
+import com.amazonaws.auth.AWSCredentials
+import com.amazonaws.auth.BasicAWSCredentials
+import java.net.UnknownHostException
+import java.net.InetAddress
+import
com.amazonaws.services.kinesis.clientlibrary.lib.worker.KinesisClientLibConfiguration
+import java.nio.charset.Charset
+import
com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessorFactory
+import
com.amazonaws.services.kinesis.clientlibrary.exceptions.ShutdownException
+import
com.amazonaws.services.kinesis.clientlibrary.exceptions.ThrottlingException
+import
com.amazonaws.services.kinesis.clientlibrary.exceptions.InvalidStateException
+import
com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessorCheckpointer
+import com.amazonaws.services.kinesis.clientlibrary.lib.worker.Worker
+import com.amazonaws.services.kinesis.clientlibrary.types.ShutdownReason
+import com.amazonaws.services.kinesis.model.Record
+import
com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessor
+import org.apache.spark.streaming.dstream.NetworkInputDStream
+import scala.collection.JavaConversions._
+import java.util.List
+
+
+private[streaming]
+class KinesisInputDStream[T: ClassTag](
+ @transient ssc_ : StreamingContext,
+ accesskey:String,
+ accessSecretKey:String,
+ kinesisStream:String,
+ kinesisEndpoint:String,
+ storageLevel: StorageLevel
+ ) extends NetworkInputDStream[String](ssc_) {
+
+
+ override def getReceiver(): NetworkReceiver[String] = {
+ new
KinesisReceiver(accesskey,accessSecretKey,kinesisStream,kinesisEndpoint,storageLevel)
+ }
+}
+
+
+object AllDone extends Exception { }
+
+private[streaming]
+class KinesisReceiver[T: ClassTag](
+ accesskey:String,
+ accessSecretKey:String,
+ kinesisStream:String,
+ kinesisEndpoint:String,
+ storageLevel: StorageLevel
+ ) extends NetworkReceiver[String] {
+
+ val NUM_RETRIES =5
+ val BACKOFF_TIME_IN_MILLIS =2000
+ var workerId = UUID.randomUUID().toString()
+
+ lazy val credentialsProvider = new AWSCredentialsProvider {
+
+ def getCredentials():AWSCredentials = {
+ if (accesskey.isEmpty()||accessSecretKey.isEmpty) {
+ new InstanceProfileCredentialsProvider().getCredentials()
+ }else{
+ new BasicAWSCredentials(accesskey,accessSecretKey)
+ }
+ }
+
+ def refresh() {}
+ }
+
+ try {
+ workerId = InetAddress.getLocalHost().getCanonicalHostName() + ":" +
UUID.randomUUID()
+ } catch {
+ case e:UnknownHostException => e.printStackTrace()
+ }
+
+ private lazy val decoder = Charset.forName("UTF-8").newDecoder();
+ private lazy val kinesisClientLibConfiguration = new
KinesisClientLibConfiguration(kinesisStream, kinesisStream,
credentialsProvider,workerId).withKinesisEndpoint(kinesisEndpoint)
+ private lazy val blockGenerator = new BlockGenerator(storageLevel)
+
+ protected override def onStart() {
+
+ blockGenerator.start()
+ lazy val recordProcessorFactory:IRecordProcessorFactory = new
IRecordProcessorFactory{
+ def createProcessor():IRecordProcessor= new IRecordProcessor {
+
+ def initialize(shardId:String){
+ logInfo("starting with shardId: "+shardId)
+ }
+
+ def processRecords(records: List[Record], checkpointer :
IRecordProcessorCheckpointer) {
+ records.toList.foreach(record=>{
+
blockGenerator+=decoder.decode(record.getData()).toString();
+ })
+ checkpoint(checkpointer);
+ }
+
+ def shutdown(checkpointer :
IRecordProcessorCheckpointer, reason : ShutdownReason){
+ logInfo("Shutting Down Kinesis Receiver: "+reason)
+ }
+ }
+ }
+ val worker = new Worker(recordProcessorFactory,
kinesisClientLibConfiguration);
+ worker.run()
+ }
+
+ private def checkpoint(checkpointer : IRecordProcessorCheckpointer) {
--- End diff --
Please document what these functions are doing.
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