| /* |
| * 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 javax.annotation.Nullable; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.BatchingShuffleEntryReader; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.CachingShuffleBatchReader; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ShuffleBatchReader; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ShuffleEntry; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ShuffleEntryReader; |
| import org.apache.beam.runners.dataflow.worker.util.common.worker.ShufflePosition; |
| import org.apache.beam.sdk.util.common.Reiterator; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions; |
| |
| /** An implementation of ShuffleEntryReader that uses ApplianceShuffleReader. */ |
| public class ApplianceShuffleEntryReader implements ShuffleEntryReader { |
| private ApplianceShuffleReader applianceShuffleReader; |
| private ShuffleEntryReader entryReader; |
| |
| public ApplianceShuffleEntryReader( |
| byte[] shuffleReaderConfig, |
| BatchModeExecutionContext executionContext, |
| DataflowOperationContext operationContext, |
| boolean cache) { |
| Preconditions.checkArgument(shuffleReaderConfig != null); |
| applianceShuffleReader = new ApplianceShuffleReader(shuffleReaderConfig, operationContext); |
| |
| ShuffleBatchReader batchReader = |
| new ChunkingShuffleBatchReader(executionContext, operationContext, applianceShuffleReader); |
| |
| if (cache) { |
| // Limit the size of the cache. |
| final int maxBatches = 32; |
| batchReader = new CachingShuffleBatchReader(batchReader, maxBatches); |
| } |
| entryReader = new BatchingShuffleEntryReader(batchReader); |
| } |
| |
| @Override |
| public Reiterator<ShuffleEntry> read( |
| @Nullable ShufflePosition startPosition, @Nullable ShufflePosition endPosition) { |
| return entryReader.read(startPosition, endPosition); |
| } |
| |
| @Override |
| public void close() { |
| applianceShuffleReader.close(); |
| } |
| |
| public String getDatasetId() { |
| return applianceShuffleReader.getDatasetId(); |
| } |
| } |