com.holdenkarau.spark.testing.TestInputStream.scala Maven / Gradle / Ivy
The newest version!
/*
* 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 com.holdenkarau.spark.testing
import org.apache.spark.streaming._
import org.apache.spark._
import org.apache.spark.rdd.RDD
import scala.reflect.ClassTag
import org.apache.spark.streaming.dstream.FriendlyInputDStream
/**
* This is a input stream just for the testsuites. This is equivalent to a
* checkpointable, replayable, reliable message queue like Kafka.
* It requires a sequence as input, and returns the i_th element at the i_th batch
* under manual clock.
*
* Based on TestInputStream class from TestSuiteBase in the Apache Spark project.
*/
class TestInputStream[T: ClassTag](@transient var sc: SparkContext,
ssc_ : StreamingContext, input: Seq[Seq[T]], numPartitions: Int)
extends FriendlyInputDStream[T](ssc_) {
def start(): Unit = {}
def stop(): Unit = {}
def compute(validTime: Time): Option[RDD[T]] = {
logInfo("Computing RDD for time " + validTime)
val index = ((validTime - ourZeroTime) / slideDuration - 1).toInt
val selectedInput = if (index < input.size) input(index) else Seq[T]()
// lets us test cases where RDDs are not created
Option(selectedInput).map{si =>
val rdd = sc.makeRDD(si, numPartitions)
logInfo("Created RDD " + rdd.id + " with " + selectedInput)
rdd
}
}
}