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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.beam.runners.spark.util; | |
import java.util.List; | |
import org.apache.beam.runners.spark.translation.SparkCombineFn; | |
import org.apache.beam.sdk.annotations.Internal; | |
import org.apache.beam.sdk.util.WindowedValue; | |
import org.apache.beam.sdk.values.KV; | |
import org.apache.spark.api.java.JavaPairRDD; | |
import org.apache.spark.api.java.function.FlatMapFunction; | |
import org.apache.spark.streaming.api.java.JavaDStream; | |
import org.apache.spark.streaming.api.java.JavaStreamingContext; | |
import scala.collection.JavaConverters; | |
/** A set of functions to provid API compatibility between Spark 2 and Spark 3. */ | |
@Internal | |
public class SparkCompat { | |
/** | |
* Union of dStreams in the given StreamingContext. | |
* | |
* <p>This is required because the API to join (union) DStreams is different among Spark versions. | |
* See https://issues.apache.org/jira/browse/SPARK-25737 | |
*/ | |
public static <T> JavaDStream<WindowedValue<T>> joinStreams( | |
JavaStreamingContext streamingContext, List<JavaDStream<WindowedValue<T>>> dStreams) { | |
return streamingContext.union( | |
JavaConverters.asScalaIteratorConverter(dStreams.iterator()).asScala().toSeq()); | |
} | |
/** | |
* Extracts the output for a given collection of WindowedAccumulators. | |
* | |
* <p>This is required because the API of JavaPairRDD.flatMapValues is different among Spark | |
* versions. See https://issues.apache.org/jira/browse/SPARK-19287 | |
*/ | |
public static <K, InputT, AccumT, OutputT> JavaPairRDD<K, WindowedValue<OutputT>> extractOutput( | |
JavaPairRDD<K, SparkCombineFn.WindowedAccumulator<KV<K, InputT>, InputT, AccumT, ?>> | |
accumulatePerKey, | |
SparkCombineFn<KV<K, InputT>, InputT, AccumT, OutputT> sparkCombineFn) { | |
FlatMapFunction< | |
SparkCombineFn.WindowedAccumulator<KV<K, InputT>, InputT, AccumT, ?>, | |
WindowedValue<OutputT>> | |
flatMapFunction = | |
(FlatMapFunction< | |
SparkCombineFn.WindowedAccumulator<KV<K, InputT>, InputT, AccumT, ?>, | |
WindowedValue<OutputT>>) | |
windowedAccumulator -> | |
sparkCombineFn.extractOutputStream(windowedAccumulator).iterator(); | |
return accumulatePerKey.flatMapValues(flatMapFunction); | |
} | |
} |
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