| /* |
| * 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.dataflow.worker; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkState; |
| |
| import com.google.api.services.dataflow.model.SideInputInfo; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.beam.runners.dataflow.internal.IsmFormat.IsmRecordCoder; |
| import org.apache.beam.runners.dataflow.util.CloudObject; |
| import org.apache.beam.runners.dataflow.util.CloudObjects; |
| import org.apache.beam.runners.dataflow.util.PropertyNames; |
| import org.apache.beam.runners.dataflow.util.Structs; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoFn; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.Receiver; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.WindowedValue; |
| import org.apache.beam.sdk.values.KV; |
| import org.apache.beam.sdk.values.TupleTag; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList; |
| |
| /** |
| * A {@link ParDoFnFactory} that creates a system {@link ParDoFn} responsible for limiting the users |
| * key space to a fixed key space used to limit the number of ISM shards. This is done by |
| * transforming {@code WindowedValue<KV<K, V>>} into {@code WindowedValue<KV<VarInt32, KV<KV<K, |
| * Window>, V>>>} by applying a hashing function on the user key {@code K} and building a sort key |
| * based upon the user key {@code K} and the window. |
| * |
| * <p>This {@link ParDoFnFactory} is part of an expansion of steps required to materialize ISM |
| * files. See <a href="go/dataflow-side-inputs">go/dataflow-side-inputs</a> for further details. |
| */ |
| public class CreateIsmShardKeyAndSortKeyDoFnFactory implements ParDoFnFactory { |
| |
| @Override |
| public ParDoFn create( |
| PipelineOptions options, |
| CloudObject cloudUserFn, |
| List<SideInputInfo> sideInputInfos, |
| TupleTag<?> mainOutputTag, |
| Map<TupleTag<?>, Integer> outputTupleTagsToReceiverIndices, |
| DataflowExecutionContext<?> executionContext, |
| DataflowOperationContext operationContext) |
| throws Exception { |
| Coder<?> coder = |
| CloudObjects.coderFromCloudObject( |
| CloudObject.fromSpec(Structs.getObject(cloudUserFn, PropertyNames.ENCODING))); |
| checkState( |
| coder instanceof IsmRecordCoder, |
| "Expected to received an instanceof an IsmRecordCoder but got %s", |
| coder); |
| return new CreateIsmShardKeyAndSortKeyParDoFn((IsmRecordCoder<?>) coder); |
| } |
| |
| private static class CreateIsmShardKeyAndSortKeyParDoFn<K, V> implements ParDoFn { |
| |
| private final IsmRecordCoder<?> coder; |
| private Receiver receiver; |
| |
| CreateIsmShardKeyAndSortKeyParDoFn(IsmRecordCoder<?> coder) { |
| this.coder = coder; |
| } |
| |
| @Override |
| public void startBundle(Receiver... receivers) throws Exception { |
| checkState( |
| receivers.length == 1, |
| "%s.startBundle() called with %s receivers, expected exactly 1. " |
| + "This is a bug in the Dataflow service", |
| getClass().getSimpleName(), |
| receivers.length); |
| this.receiver = receivers[0]; |
| } |
| |
| @Override |
| public void processElement(Object untypedElem) throws Exception { |
| @SuppressWarnings("unchecked") |
| WindowedValue<KV<K, V>> elem = (WindowedValue) untypedElem; |
| |
| K userKey = elem.getValue().getKey(); |
| V userValue = elem.getValue().getValue(); |
| int hashKey = coder.hash(ImmutableList.of(elem.getValue().getKey())); |
| |
| // Explode all the windows the users values are in. |
| for (BoundedWindow window : elem.getWindows()) { |
| KV<K, BoundedWindow> sortKey = KV.of(userKey, window); |
| KV<KV<K, BoundedWindow>, V> valueWithSortKey = KV.of(sortKey, userValue); |
| // Note that the shuffle writer expects a KV<PrimaryKey, KV<SortKey, Value>> when sorting. |
| receiver.process(elem.withValue(KV.of(hashKey, valueWithSortKey))); |
| } |
| } |
| |
| @Override |
| public void processTimers() {} |
| |
| @Override |
| public void finishBundle() {} |
| |
| @Override |
| public void abort() {} |
| } |
| } |