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Refactored code, fixed bugs, added unit tests
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streaming/src/main/scala/org/apache/spark/streaming/dstream/EmittedRecordsDStream.scala
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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. | ||
| */ | ||
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| package org.apache.spark.streaming.dstream | ||
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| import scala.reflect.ClassTag | ||
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| import org.apache.spark._ | ||
| 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} | ||
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| abstract class EmittedRecordsDStream[K: ClassTag, V: ClassTag, S: ClassTag, T: ClassTag]( | ||
| ssc: StreamingContext) extends DStream[T](ssc) { | ||
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| def stateSnapshots(): DStream[(K, S)] | ||
| } | ||
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| private[streaming] class EmittedRecordsDStreamImpl[K: ClassTag, V: ClassTag, S: ClassTag, T: ClassTag]( | ||
| trackStateDStream: TrackStateDStream[K, V, S, T]) | ||
| extends EmittedRecordsDStream[K, V, S, T](trackStateDStream.context) { | ||
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| override def slideDuration: Duration = trackStateDStream.slideDuration | ||
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| override def dependencies: List[DStream[_]] = List(trackStateDStream) | ||
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| override def compute(validTime: Time): Option[RDD[T]] = { | ||
| trackStateDStream.getOrCompute(validTime).map { _.flatMap[T] { _.emittedRecords } } | ||
| } | ||
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| def stateSnapshots(): DStream[(K, S)] = { | ||
| trackStateDStream.flatMap[(K, S)] { _.stateMap.getAll().map { case (k, s, _) => (k, s) }.toTraversable } | ||
| } | ||
| } | ||
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| /** | ||
| * A DStream that allows per-key state to be maintains, and arbitrary records to be generated | ||
| * based on updates to the state. | ||
| * | ||
| * @param parent Parent (key, value) stream that is the source | ||
| * @param spec Specifications of the trackStateByKey operation | ||
| * @tparam K Key type | ||
| * @tparam V Value type | ||
| * @tparam S Type of the state maintained | ||
| * @tparam T Type of the eiitted records | ||
| */ | ||
| private[streaming] class TrackStateDStream[K: ClassTag, V: ClassTag, S: ClassTag, T: ClassTag]( | ||
| parent: DStream[(K, V)], spec: TrackStateSpecImpl[K, V, S, T]) | ||
| extends DStream[TrackStateRDDRecord[K, S, T]](parent.context) { | ||
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| persist(StorageLevel.MEMORY_ONLY) | ||
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| private val partitioner = spec.getPartitioner().getOrElse( | ||
| new HashPartitioner(ssc.sc.defaultParallelism)) | ||
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| private val trackingFunction = spec.getFunction() | ||
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| override def slideDuration: Duration = parent.slideDuration | ||
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| override def dependencies: List[DStream[_]] = List(parent) | ||
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| override val mustCheckpoint = true | ||
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| /** Method that generates a RDD for the given time */ | ||
| override def compute(validTime: Time): Option[RDD[TrackStateRDDRecord[K, S, T]]] = { | ||
| val prevStateRDD = getOrCompute(validTime - slideDuration).getOrElse { | ||
| TrackStateRDD.createFromPairRDD[K, V, S, T]( | ||
| spec.getInitialStateRDD().getOrElse(new EmptyRDD[(K, S)](ssc.sparkContext)), | ||
| partitioner, | ||
| validTime.milliseconds | ||
| ) | ||
| } | ||
| val newDataRDD = parent.getOrCompute(validTime).get | ||
| val partitionedDataRDD = newDataRDD.partitionBy(partitioner) | ||
| val timeoutThresholdTime = spec.getTimeoutInterval().map { interval => | ||
| (validTime - interval).milliseconds | ||
| } | ||
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| Some(new TrackStateRDD(prevStateRDD, partitionedDataRDD, | ||
| trackingFunction, validTime.milliseconds, timeoutThresholdTime)) | ||
| } | ||
| } |
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