| /* |
| * 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.accumulo.examples.filedata; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.client.mapreduce.InputFormatBase; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.examples.util.FormatUtil; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import com.google.common.collect.Iterators; |
| import com.google.common.collect.PeekingIterator; |
| |
| /** |
| * An InputFormat that turns the file data ingested with {@link FileDataIngest} into an InputStream |
| * using {@link ChunkInputStream}. Mappers used with this InputFormat must close the InputStream. |
| */ |
| public class ChunkInputFormat extends InputFormatBase<List<Entry<Key,Value>>,InputStream> { |
| @Override |
| public RecordReader<List<Entry<Key,Value>>,InputStream> createRecordReader(InputSplit split, |
| TaskAttemptContext context) { |
| return new RecordReaderBase<List<Entry<Key,Value>>,InputStream>() { |
| private PeekingIterator<Entry<Key,Value>> peekingScannerIterator; |
| |
| @Override |
| public void initialize(InputSplit inSplit, TaskAttemptContext attempt) throws IOException { |
| super.initialize(inSplit, attempt); |
| peekingScannerIterator = Iterators.peekingIterator(scannerIterator); |
| currentK = new ArrayList<>(); |
| currentV = new ChunkInputStream(); |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException { |
| log.debug("nextKeyValue called"); |
| |
| currentK.clear(); |
| if (peekingScannerIterator.hasNext()) { |
| ++numKeysRead; |
| Entry<Key,Value> entry = peekingScannerIterator.peek(); |
| while (!entry.getKey().getColumnFamily().equals(FileDataIngest.CHUNK_CF)) { |
| currentK.add(entry); |
| peekingScannerIterator.next(); |
| if (!peekingScannerIterator.hasNext()) { |
| return true; |
| } |
| entry = peekingScannerIterator.peek(); |
| } |
| currentKey = entry.getKey(); |
| ((ChunkInputStream) currentV).setSource(peekingScannerIterator); |
| if (log.isTraceEnabled()) { |
| log.trace("Processing key/value pair: " + FormatUtil.formatTableEntry(entry, true)); |
| } |
| |
| return true; |
| } |
| return false; |
| } |
| }; |
| } |
| } |