| /* |
| * 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.internal; |
| |
| import static com.google.api.client.util.Base64.encodeBase64String; |
| import static org.apache.beam.runners.dataflow.util.Structs.addString; |
| import static org.apache.beam.runners.dataflow.util.Structs.addStringList; |
| import static org.apache.beam.sdk.util.SerializableUtils.serializeToByteArray; |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkArgument; |
| |
| import com.google.api.services.dataflow.model.SourceMetadata; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.beam.runners.dataflow.options.DataflowPipelineOptions; |
| import org.apache.beam.runners.dataflow.util.CloudObject; |
| import org.apache.beam.sdk.io.BoundedSource; |
| import org.apache.beam.sdk.io.Source; |
| import org.apache.beam.sdk.io.UnboundedSource; |
| import org.apache.beam.sdk.options.PipelineOptions; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.annotations.VisibleForTesting; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A helper class for supporting sources defined as {@code Source}. |
| * |
| * <p>Provides a bridge between the high-level {@code Source} API and the low-level {@code |
| * CloudSource} class. |
| */ |
| public class CustomSources { |
| private static final String SERIALIZED_SOURCE = "serialized_source"; |
| @VisibleForTesting static final String SERIALIZED_SOURCE_SPLITS = "serialized_source_splits"; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(CustomSources.class); |
| |
| private static int getDesiredNumUnboundedSourceSplits(DataflowPipelineOptions options) { |
| int cores = 4; // TODO: decide at runtime? |
| if (options.getMaxNumWorkers() > 0) { |
| return options.getMaxNumWorkers() * cores; |
| } else if (options.getNumWorkers() > 0) { |
| return options.getNumWorkers() * cores; |
| } else { |
| return 5 * cores; |
| } |
| } |
| |
| public static com.google.api.services.dataflow.model.Source serializeToCloudSource( |
| Source<?> source, PipelineOptions options) throws Exception { |
| com.google.api.services.dataflow.model.Source cloudSource = |
| new com.google.api.services.dataflow.model.Source(); |
| // We ourselves act as the SourceFormat. |
| cloudSource.setSpec(CloudObject.forClass(CustomSources.class)); |
| addString( |
| cloudSource.getSpec(), SERIALIZED_SOURCE, encodeBase64String(serializeToByteArray(source))); |
| |
| SourceMetadata metadata = new SourceMetadata(); |
| if (source instanceof BoundedSource) { |
| BoundedSource<?> boundedSource = (BoundedSource<?>) source; |
| |
| // Size estimation is best effort so we continue even if it fails here. |
| try { |
| metadata.setEstimatedSizeBytes(boundedSource.getEstimatedSizeBytes(options)); |
| } catch (Exception e) { |
| LOG.warn("Size estimation of the source failed: " + source, e); |
| } |
| } else if (source instanceof UnboundedSource) { |
| UnboundedSource<?, ?> unboundedSource = (UnboundedSource<?, ?>) source; |
| metadata.setInfinite(true); |
| List<String> encodedSplits = new ArrayList<>(); |
| int desiredNumSplits = |
| getDesiredNumUnboundedSourceSplits(options.as(DataflowPipelineOptions.class)); |
| for (UnboundedSource<?, ?> split : unboundedSource.split(desiredNumSplits, options)) { |
| encodedSplits.add(encodeBase64String(serializeToByteArray(split))); |
| } |
| checkArgument(!encodedSplits.isEmpty(), "UnboundedSources must have at least one split"); |
| addStringList(cloudSource.getSpec(), SERIALIZED_SOURCE_SPLITS, encodedSplits); |
| } else { |
| throw new IllegalArgumentException("Unexpected source kind: " + source.getClass()); |
| } |
| |
| cloudSource.setMetadata(metadata); |
| return cloudSource; |
| } |
| } |