| /* |
| * 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.wayang.spark.channels; |
| |
| import java.util.OptionalLong; |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.util.LongAccumulator; |
| import org.apache.wayang.core.api.exception.WayangException; |
| import org.apache.wayang.core.optimizer.OptimizationContext; |
| import org.apache.wayang.core.plan.executionplan.Channel; |
| import org.apache.wayang.core.plan.wayangplan.OutputSlot; |
| import org.apache.wayang.core.platform.AbstractChannelInstance; |
| import org.apache.wayang.core.platform.ChannelDescriptor; |
| import org.apache.wayang.core.platform.ChannelInstance; |
| import org.apache.wayang.core.platform.Executor; |
| import org.apache.wayang.core.util.Actions; |
| import org.apache.wayang.spark.execution.SparkExecutor; |
| |
| /** |
| * Describes the situation where one {@link JavaRDD} is operated on, producing a further {@link JavaRDD}. |
| * <p><i>NB: We might be more specific: Distinguish between cached/uncached and pipelined/aggregated.</i></p> |
| */ |
| public class RddChannel extends Channel { |
| |
| public static final ChannelDescriptor UNCACHED_DESCRIPTOR = new ChannelDescriptor( |
| RddChannel.class, false, false |
| ); |
| |
| public static final ChannelDescriptor CACHED_DESCRIPTOR = new ChannelDescriptor( |
| RddChannel.class, true, true |
| ); |
| |
| public RddChannel(ChannelDescriptor descriptor, OutputSlot<?> outputSlot) { |
| super(descriptor, outputSlot); |
| assert descriptor == UNCACHED_DESCRIPTOR || descriptor == CACHED_DESCRIPTOR; |
| } |
| |
| private RddChannel(RddChannel parent) { |
| super(parent); |
| } |
| |
| @Override |
| public RddChannel copy() { |
| return new RddChannel(this); |
| } |
| |
| @Override |
| public Instance createInstance(Executor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| return new Instance((SparkExecutor) executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| /** |
| * {@link ChannelInstance} implementation for {@link RddChannel}s. |
| */ |
| public class Instance extends AbstractChannelInstance { |
| |
| private JavaRDD<?> rdd; |
| |
| private LongAccumulator accumulator; |
| |
| public Instance(SparkExecutor executor, |
| OptimizationContext.OperatorContext producerOperatorContext, |
| int producerOutputIndex) { |
| super(executor, producerOperatorContext, producerOutputIndex); |
| } |
| |
| public void accept(JavaRDD<?> rdd, SparkExecutor sparkExecutor) throws WayangException { |
| if (this.isMarkedForInstrumentation() && !this.isRddCached()) { |
| final LongAccumulator accumulator = sparkExecutor.sc.sc().longAccumulator(); |
| accumulator.setValue(0); |
| this.rdd = rdd.filter(dataQuantum -> { |
| accumulator.add(1); |
| return true; |
| }); |
| this.accumulator = accumulator; |
| } else { |
| this.rdd = rdd; |
| } |
| } |
| |
| |
| @SuppressWarnings("unchecked") |
| public <T> JavaRDD<T> provideRdd() { |
| return (JavaRDD<T>) this.rdd; |
| } |
| |
| @Override |
| protected void doDispose() { |
| if (this.accumulator != null) { |
| this.setMeasuredCardinality(this.accumulator.value()); |
| this.accumulator = null; |
| } |
| if (this.isRddCached() && this.rdd != null) { |
| Actions.doSafe(this.rdd::unpersist); |
| logger.debug("Unpersisted {}.", this.rdd); |
| this.rdd = null; |
| } |
| } |
| |
| @Override |
| public OptionalLong getMeasuredCardinality() { |
| if (this.accumulator != null) { |
| this.setMeasuredCardinality(this.accumulator.value()); |
| } |
| return super.getMeasuredCardinality(); |
| } |
| |
| @Override |
| public RddChannel getChannel() { |
| return RddChannel.this; |
| } |
| |
| private boolean isRddCached() { |
| return this.getChannel().isReusable(); |
| } |
| } |
| |
| } |