| /* |
| * 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.giraph.block_app.framework.output; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Queue; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| |
| import org.apache.giraph.block_app.framework.api.BlockOutputApi; |
| import org.apache.giraph.conf.GiraphConstants; |
| import org.apache.giraph.utils.CallableFactory; |
| import org.apache.giraph.utils.ProgressableUtils; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * Handler for blocks output - keeps track of outputs and writers created |
| */ |
| @SuppressWarnings("unchecked") |
| public class BlockOutputHandle implements BlockOutputApi { |
| private transient Configuration conf; |
| private transient Progressable progressable; |
| private final Map<String, BlockOutputDesc> outputDescMap; |
| private final Map<String, Queue<BlockOutputWriter>> freeWriters = |
| new HashMap<>(); |
| private final Map<String, Queue<BlockOutputWriter>> occupiedWriters = |
| new HashMap<>(); |
| |
| public BlockOutputHandle() { |
| outputDescMap = null; |
| } |
| |
| public BlockOutputHandle(String jobIdentifier, Configuration conf, |
| Progressable hadoopProgressable) { |
| outputDescMap = BlockOutputFormat.createInitAndCheckOutputDescsMap( |
| conf, jobIdentifier); |
| for (Map.Entry<String, BlockOutputDesc> entry : outputDescMap.entrySet()) { |
| entry.getValue().preWriting(); |
| freeWriters.put(entry.getKey(), |
| new ConcurrentLinkedQueue<BlockOutputWriter>()); |
| occupiedWriters.put(entry.getKey(), |
| new ConcurrentLinkedQueue<BlockOutputWriter>()); |
| } |
| initialize(conf, hadoopProgressable); |
| } |
| |
| public void initialize(Configuration conf, Progressable progressable) { |
| this.conf = conf; |
| this.progressable = progressable; |
| } |
| |
| |
| @Override |
| public <OW extends BlockOutputWriter, OD extends BlockOutputDesc<OW>> |
| OD getOutputDesc(String confOption) { |
| if (outputDescMap == null) { |
| throw new IllegalArgumentException( |
| "Output cannot be used with checkpointing"); |
| } |
| return (OD) outputDescMap.get(confOption); |
| } |
| |
| @Override |
| public <OW extends BlockOutputWriter> OW getWriter(String confOption) { |
| if (outputDescMap == null) { |
| throw new IllegalArgumentException( |
| "Output cannot be used with checkpointing"); |
| } |
| OW outputWriter = (OW) freeWriters.get(confOption).poll(); |
| if (outputWriter == null) { |
| outputWriter = (OW) outputDescMap.get(confOption).createOutputWriter( |
| conf, progressable); |
| } |
| occupiedWriters.get(confOption).add(outputWriter); |
| return outputWriter; |
| } |
| |
| public void returnAllWriters() { |
| for (Map.Entry<String, Queue<BlockOutputWriter>> entry : |
| occupiedWriters.entrySet()) { |
| freeWriters.get(entry.getKey()).addAll(entry.getValue()); |
| entry.getValue().clear(); |
| } |
| } |
| |
| public void closeAllWriters() { |
| final Queue<BlockOutputWriter> allWriters = new ConcurrentLinkedQueue<>(); |
| for (Queue<BlockOutputWriter> blockOutputWriters : freeWriters.values()) { |
| allWriters.addAll(blockOutputWriters); |
| } |
| if (allWriters.isEmpty()) { |
| return; |
| } |
| // Closing writers can take time - use multiple threads and call progress |
| CallableFactory<Void> callableFactory = new CallableFactory<Void>() { |
| @Override |
| public Callable<Void> newCallable(int callableId) { |
| return new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| BlockOutputWriter writer = allWriters.poll(); |
| while (writer != null) { |
| writer.close(); |
| writer = allWriters.poll(); |
| } |
| return null; |
| } |
| }; |
| } |
| }; |
| ProgressableUtils.getResultsWithNCallables(callableFactory, |
| Math.min(GiraphConstants.NUM_OUTPUT_THREADS.get(conf), |
| allWriters.size()), "close-writers-%d", progressable); |
| // Close all output formats |
| for (BlockOutputDesc outputDesc : outputDescMap.values()) { |
| outputDesc.postWriting(); |
| } |
| } |
| } |